Retrospective: 1974-1977 Montesa Cota 247-T

1977 Montesa Cota 247-T
1977 Montesa Cota 247-T. Owner: Pete Gray, Atascadero, California.

The Spanish Civil War ended in 1939, and then the rest of Europe spun out of control. Spain sensibly decided to stay neutral in World War II. With a limited domestic market, business stagnated. But by 1944, with the end of that conflict in sight, Spaniards started thinking about the future. A couple of like-minded fellows, Pedro Permanyer and Francisco Bulto, met up and decided that providing their countrymen with basic transportation could be profitable. They built a factory in Barcelona and began producing Montesa motorcycles, little two-stroke singles under 125cc, and had great success. But the partners had their differences, and in 1958 Bulto went off on his own to found the Bultaco motorcycle company.

Permanyer persisted, built larger engines, and in 1965 showed the 247cc engine (21 horsepower at 7,000 rpm) in a Scorpion motocrosser. Several years later a mildly detuned version appeared in the Cota trials bike, and in 1968 the Cota won the Spanish Trials Championship. It should be noted that trials competitions were very popular in Europe, less so in the U.S.

1977 Montesa Cota 247-TIn the early 1970s the Japanese OEMs began modifying some of their competitive 250 dirt models into more civilized trail bikes, or as we might say today, dual-purpose. These had two-up seats, lights, a horn, whatever it took to make them street-legal. Permanyer took note. He had a great 250 engine, seen in motocross, roadracing, enduro and trials versions, so why not turn that trials bike into a trail version for the European street crowd; those countries weren’t quite as fearful of two-stroke emissions as were the Americans. The Cota 247-T (for Trail) was born.

Montesa had about 300 dealers in the U.S., who were doing well with some of the competition bikes. Apparently the importer thought this 247-T could be an added attraction. According to sketchy records the factory produced some 2,300 of them, with very few coming to this country. One reason being that it was expensive compared to the competition.

1977 Montesa Cota 247-TThe Owner’s Manual, in Spanish, English and French, begins well: “The MONTESA motorcycle which model is introduced here do (sic) not require an excessive care for maintenance, only a minimum attention is required to ensure a long and perfect serviceable time.” Truth, as the Cota is a delightfully basic machine.

The oversquare piston-port single cylinder has a bore of 72.5mm, stroke, 60mm, with a compression ratio of 10 to 1, generating some 19 horsepower at 6,500 rpm. Ignition is via a flywheel magneto/alternator and coil. The header pipe goes out the left side, high up, with a two-part muffler and spark arrestor. A respectable muffler, too, the two-stroke pop-pop being pleasantly muted.

The air cleaner is under the seat, with a Spanish-made 27mm Amal carburetor carrying fuel into the engine. A previous owner of this bike has replaced the Amal with a Mikuni. Should there be a need to remove the carb, the manual says, “Have in mind that you must shut the entrance of the admission pipe while the carburetor is out, in order to avoid the entrance of odd objects in the interior of the cylinder.”

1977 Montesa Cota 247-TPrimary drive is via spur gears, 22 teeth off the crankshaft, 64 teeth on the clutch, which uses “multiple steel discs in oil bath with constant tension springs….” That power goes through a five-speed transmission to a 10-tooth countershaft sprocket and a 40-toother on the back wheel. A very nifty chain-oiler has been built into the right arm of the swingarm, which holds a supply of oil that drips onto the chain just as it enters a tensioning device.

The engine/transmission unit sits in a tubular steel frame, with bolts holding it steady fore, aft and top. A single tube comes down from the reinforced steering head, spreading into a cradle at the front of the crankcase, with a sturdy skid plate built in. A small hole in the skid plate allows access to the drain plug. The rear section, holding the seat and upper shock absorber mounts, is built into the main frame, with a strong pivot point for the swingarm. The shocks on this model have no identification mark, but are probably of Telesco making. The telescoping fork is Montesa-made, with a 29.5-degree rake, 5.6 inches of trail.

A 21-inch wheel at the front wears a 2.75 tire, an 18-incher at the back has a 4.00 tire. Small 110mm single-leading-shoe full-width drum brakes are at both ends. When inspecting the wheels it is advisable “to slightly grease all the whirling points with SAE-40 oil.” A short 51.5 inches lie between the axles.

1977 Montesa Cota 247-TThe bike has an attractively slim look, having a narrow 2.14-gallon fiberglass gas tank with wings extending under the long saddle. Fenders are lightweight alloy. A small headlight, horn and taillight make it more or less roadworthy, except there is no battery. The speedometer is missing from the photo model. A modest toolkit fits into a cylindrical container beneath the seat. Dry weight, according to the manual, is 200 pounds…lightweight fun!

The last 247cc 247-T was built in 1977, the similarly branded 1978 version having a slightly smaller 237cc engine. That model was then dropped, but the 348-T version kept on for two more years.

Postscript: In 1980 a trials version, the Cota 348, won the World Trials Championship, but Montesa was running into serious financial difficulties. The next year Honda essentially bought the company in order to have better access to the European market, and Montesa Cota models are still being built–albeit with four-stroke engines.

Source: RiderMagazine.com

Follow Ducati Team’s presentation live!

The Bologna factory will show off their Desmosedici GP19 machine in Neuchatel, Switzerland, with both Andrea Dovizioso and his new teammate Danilo Petrucci present. You can watch the unveiling of a potential title-winning bike right here on motogp.com, where we will have a live broadcast of Ducati Team’s presentation starting at 18:00 local time (GMT +1). 

Source: MotoGP.comRead Full Article Here

Water to cool melting tar in heatwave

Water will be sprayed over the Oxley Highway in the next few days as the road melts even more in the current heatwave conditions.

The road began melting in December in 31C heat and is now melting even more as temperature soar higher.

Save the Oxley campaigner Ken Healey says the lines of molten tar are “right on the line your bike is going to take”.

In a short-term fix, the Roads and Maritime Services poured sand on the slippery melting tar last week. This prompted outrage from riders.

Motorcycle Council of NSW chairman Steve Pearce said it was “very disappointing to see this work without any consideration for motorcyclists”.

“You could easily come to the conclusion that Melinda Pavey doesn’t want motorcyclists to use this road, remember it was just a year ago when the speed limit was dropped,” he says.Oxley Highway sand fix water

Water to cool road

Now the RMS says Walcha Council will spray the melting road surface with water between Toms Creek and 85km west of Wauchope “due to extreme heatwave conditions”.

“Roads and Maritime Services acknowledge water is a scarce resource at this time, however it is required to ensure the safety of motorists and keep the road open,” a spokesperson says.

“Council will be monitoring the road and will use the water cart as required to cool the bitumen for the safety of all road users.

“Roads and Maritime is working with Walcha Council to identify and carry out further work in the coming weeks, taking into account appropriate weather conditions required for this treatment.

“Road users are reminded to take care and drive to conditions on all roads in northern and western NSW following extreme weather events.”

Speeds in affected areas will be reduced to 60km/h with variable message signs indicating the speed change and the affected road surface.

After the images were posted, RMS spread thick sand over the road in what independent road surface expert and rider Ian Kite says is a short-term fix only.

Melting tar causeMelting tar claims first crash victim Mt Glorious costly repair bitumen fix water

Ian Kite, a 40-year local government infrastructure manager and lecturer in road construction, pavement design and bitumen sealing says the technical term for melting tar is “bleeding”.

“The cause of the problem is the aggregate in the seal being completely submerged by the bitumen and allowing the tyres to make contact with the bitumen,” he says.

“This can be caused by a number of factors – usually a combination of several.”Melting tar on Oxley highway sand fix water

How to fix the issue

Ian says sand is the “quickest/simplest/cheapest solution” in the short term to absorb the excess bitumen.

Sometimes fine aggregate or crusher dust is also applied.

“The bitumen adheres to the surface of the particles and is no longer free to stick to tyres or present a slick surface,” he says.

He says the photos of the road indicate a high application rate of sand resulting in a loose, unbound surface “not much better than the slick road”.Oxley Highway sand fix water

“It’s pretty hard/near impossible to get the application rate just right since the bleeding of the surface is not uniform,” he says.

“Therefore it is usual to over-apply the sand or dust, but sweep off the excess ASAP.

“Until the sweeping is done, appropriate ‘slippery surface’ signage should be in place.

“I would expect the sweeping to be carried out within 24 hours. It may be necessary to re-apply the sand on subsequent hot days followed by sweeping.”

Other long-term solutions require analysis, design and specialist equipment to implement, Ian says.

Treatments include application of a “fog” coat of bitumen, rolling in another layer of aggregate, removal of excess bitumen by water blasting and replacement of the entire seal.

Ian says the analysis, design and resourcing of these treatments may take a couple of months to a year to organise and finance.

Mt Glorious melts

New roadworks on Mt Glorious melting tar reservations bitumen fix water
(Photoshopped sign for irony!)

Similar melting tar on the Mt Glorious Rd west of Brisbane in 2017 resulted in at least one rider crashing.

Queensland Main Roads spent months working on the road to fix the issue with various methods.

More information about road conditions across Queensland are available on TMR’s website or by phoning 13 19 40.

Source: MotorbikeWriter.com

Should cyclists wear identification?

The Tasmanian Motorcycle Council (TMC) has called for free identification numbers, not registration, for cyclists over 18 so their traffic offences can be reported and riders fined.

It’s an old complaint about cyclists disobeying road rules and not being fined that surfaces every now and then.

Council president Paul Bullock says his call follows “many complaints” from motorcyclists, car drivers, bus drivers and truck drivers about cyclists who behave irresponsibly.

Since his call for cyclist ID, the TMC has received “lots of negative responses from cyclists but very positive from all other road users”.Identification bicycle

Identification not registration

However, this is not the usual call for cyclists to pay registration fees. After all, most cyclists are already motorists who pay rego that goes into maintaining our roads.

“Cyclists don’t understand it is for identification, not registration. It is to stop cyclists breaking the law. At no cost to the cyclist,” Paul says.

The TMC wants cyclists over 18 to wear some form of reflective identification number on their bike, clothing or helmet. Paul says it could be funded through the road safety levy.

Maritha Keyser Cyclist rule endangers motorcyclists
Tasmanian road sign

Rule breakers

What seems to irk many motorists is that cyclists get political favour, their own lanes, free footpath parking and yet avoid traffic offences.

We receive many complaints of cyclists blocking the road, breaking road rules, running red lights and even speeding down hills.

I was recently overtaken in a 50km/h downhill zone on Mt Coot-tha, Brisbane, by a cyclist who at the end of the road didn’t stop for a stop sign.Identification bicycle

However, cyclists are not avoiding traffic fines altogether.

In the past two years, Queensland Police alone have booked more than 230 cyclists for speeding and 540 for running red lights.

The TMC also provided this list of traffic offences in Tasmania by cyclists:

Offence Legislation Fine Code Item Penalty
Unit
Cyclist unreasonably obstructing the path of other driver/pedestrian RR 125(1) $81.50 B819 174 0.5
Cyclist ride without due care and attention RR 367(1) $122.25 BC11 441 0.75
Cycle without reasonable consideration for other road users RR 367(2) $81.50 BC12 442 0.5
Cyclist unreasonably obstructing the path of other driver/pedestrian RR 125(1) $81.50 B819 174 0.5
Cyclist not seated astride and facing forward RR 245(a) $81.50 BA97 330 0.5
Cyclist riding with no hands on handlebars RR 245(b) $81.50 BA97 330 0.5
Cyclist seated other than on seat RR 245(c) $81.50 BA98 331 0.5
Cyclist fail to ride in bicycle lane RR 247(1) $122.25 BB01 335 0.75
Cyclist cause traffic hazard (moving into path of driver/pedestrian RR 253 $122.25 BB22 345 0.75
Ride bicycle with no warning device in working order RR 258(b) $81.50 BB38 356 0.5

With identification numbers, more traffic offences could be issued, more than paying for the cost to implement the program.

While the majority of cyclists obey the law there is an element within the cycling fraternity that continually do not,” Paul says.

“They obstruct vehicles travelling on the road; while travelling in a group doing far less speed compared to other vehicles, they will not move into single file to allow vehicles to pass.

“Cyclists use the excuse that they are entitled to ride two abreast on the road, while failing to accept that they are unreasonably obstructing traffic, which is illegal.

“Despite it being legal for cyclists to travel two abreast and laws allowing other vehicle to cross double lines to pass when safe to do so, irresponsible and discourteous rider behaviour puts cyclists and other road users at risk.”

Petitions against cyclists

Last year, a Change.org petition was started by Drivers For Registration of Cyclists for cyclists to ride single file.

It has so far received more than 134,000 signatures.

Identification bicycles cyclist
Image from the Change.org.au petition

Meanwhile, a 2017 petition against a rule allowing motorists to cross solid and double white lines to pass cyclists thus endangering oncoming motorcyclists has closed with only 2327 supporters.

Petition organiser Maritha Keyser, who was injured in such an incident, closed the petition after failing to gain the attention of any politicians.

 

Source: MotorbikeWriter.com

Podium the target for injured Dakar leader Price

Australian fan-favourite nursing wrist injury into the final stage.

Image: Supplied.

Red Bull KTM Factory Racing’s Toby Price says he’ll be more than happy with a podium finish in this year’s Dakar Rally as he leads the Bike category into the final stage.

Price has been battling through a broken scaphoid sustained late last year in a training incident, although it hasn’t slowed down the Australian fan-favourite, remaining consistently up front in the demanding event.

Yet to take out a stage victory, the former Dakar victor took ahold of the standings on stage eight and carried his lead through to the penultimate day, where he now holds a 1m2s advantage over Rockstar Energy Husqvarna Factory Racing’s Pablo Quintanilla.

“I got through stage nine today where we had the mass-start,” Price explained. “There was no chance to make up any time or lose time really, I just had to stick with the group.

“Tomorrow is only a 100-kilometre stage, but I think it’s going to feel more like 300. The boys are really going to up their pace and all I can do is try my best once more and try to stay with them. If I can get through tomorrow and finish on the podium, I’ll be more than happy.”

Quintanilla, who’s on the cusp of a history-making result for Husqvarna that could end KTM’s dominant 17-year winning streak, acknowledges he’s in a prime position to take out the win, which is what his eyes are firmly set on for the final day of racing.

“I’m in a great spot right now to battle for the win and I’m really happy about that,” said Quintanilla. “Securing a podium result would be great for me and the team, but honestly my eyes are set on getting the win here in Peru.

“Tomorrow I’m determined to give it all for the win. There’s just one minute separating me and Toby [Price] and the day will be long. No matter what happens tomorrow I am very satisfied with my performance at this Dakar. I gave 100 percent on each day and that’s what matters the most for me.”

Defending champion Matthias Walkner (Red Bull KTM Factory Racing) sits in third, a further 6m35s behind Price, and still stands a chance at victory in the unpredictable event.


Source: MotoOnline.com.au

SBS Brakes Announces New DS-2 Brake Pad Compound

With the DS-2, SBS introduces a different technique for adjusting braking to the rider’s liking: mounting two different compounds for track use.

Begin press release:


After more than two years testing, the well-known racing brake pad compound DS-1 is now followed by DS-2 to match different braking performances. From the testing not only a new compound, but a whole new unique concept emerged: The combination of mounting two different compounds for track use.

SBS has been actively involved in road racing at the highest level since the 1990s. Over the last 2 seasons, selected teams in the World Superbike, Moto2 and Moto3 GP, British Superbike and World Endurance Championships have therefore actively participated in fine-tuning of the latest compound from SBS Friction A/S now launched as DS-2 Dual Sinter.

The DS-2 has been developed based on requests from riders wanting a compound with a little more human initial bite and more powerful braking power in the end of long brakings compared to DS-1.

During the development SBS received various feedback. SBS race manager Allan Østli: “Many riders were very satisfied with the new DS-2, but some still felt that the initial bite was reduced too much compared to DS-1. On the other hand some riders who preferred DS-1, occasionally missed a little more braking power at the end of braking with DS-2. Therefore a completely new braking concept emerged: The Dynamic Racing Concept combining the strong initial bite and linear in-stop performance from DS-1 and the smooth initial bite and progressive in-stop performance from DS-2”.

The Dynamic Racing Concept makes it possible to fit the DS-1 on the left hand side brake disc and DS-2 on the right hand side brake disc, thus achieving a combination of the different performance characteristics of the two compounds. In short, a fine tuning of braking performance for the individual rider’s brake preferences.

SBS riders still have different preferences and Kervin Bos, Technical Team Manager Red Bull Honda World Superbike Team and his team prefer the new DS-2 “Our partnership with SBS is a great asset for our team in the WorldSBK championship – the support we receive and quality of the product are second to none.

Our technical partnership with SBS allows us to develop the optimum brake performance to suit each rider. For us, the standout performer is SBS DS-2 brake pad”.

The cooperation between SBS and a large number of winning teams has made high demands on SBS Research and Development and has led to many titles in the World Superbike, Supersport and Superstock classes and even more titles in National Championships worldwide. All SBS DS brake pads are made using NRS technology. NRS Safe products exclusively use the NUCAP Retention System (NRS), the most advanced mechanical attachment technology with a zero failure rate in over 1 Billion units Worldwide.

Visit the SBS website for more details.













The post SBS Brakes Announces New DS-2 Brake Pad Compound appeared first on Motorcycle.com News.

1992 Honda NR750 | RC40 oval piston V4 Honda Superbike

With Phil Aynsley


Honda’s concept of an oval-pistoned engine (or more correctly, a bore/piston with straight sides and semicircular ends) began with the development of the 1979 NR500 GP machine. Honda had been out of Grand Prix racing for 12 years, and when they returned they wanted to showcase four-stroke technology.

Honda NR
Honda NR500

Of course at the time 500 Grand Prix was dominated by two-strokes, and that trend continued despite Honda’s best efforts with that original NR500.


“When I look back at it, I’m not sure if we were experimenting with cutting-edge technologies or obsessed with foolish ideas,” recalled Toshimitsu Yoshimura, an engineer involved in the development of the first NR500’s oval piston engine.

“At least we were doing something that was beyond the realm of conventional thinking. I’m not just talking about us, who were designing the engine, but also those who were creating the body.

“The emphasis was to create a difference-not just any difference but the difference that would work to our definite advantage. That’s why we decided that Honda should go with four-stroke engines. We wanted to achieve our target through innovative technology, and in so doing have the edge over our competition.”

Honda NR Mick Grant
Mick Grant – Honda NR500 – 1979

“We didn’t think much about whether the engine would actually turn over,” Yoshimura recalled, “or even whether it would be practical at all. We weren’t worried about those things, since we just wanted to make it work.”

Honda NR Piston Valves Rods
Later they did achieve performance and reliability | Eventually the NR750 road bike was released in 1992 as a showcase of Honda’s engineering prowess – Seen here is the oval piston, eight valves, and two connecting rods that made up each of the V4s cylinders

PA HondaNR
1992 Honda NR750 ‘RC40’

The original idea was to achieve the breathing advantages and characterists of a V-8, within racing rules that stipulated a maximum of four cylinders.

PA HondaNR
1992 Honda NR750 ‘RC40’

The NR750 endurance racer that was entered in the 1987 LeMans 24 Hour and other selected events.

PA HondaNR
1992 Honda NR750 ‘RC40’

In fact Tasmania’s Malcom Campbell (who had ridden the bike at LeMans), took the NR750’s only major victory in the first leg of the Calder round of the ’87 Swann Series.

PA HondaNR
1992 Honda NR750 ‘RC40’

In 1992 Honda released the NR limited production road bike, of which only 300 were made. It cost £36,500 in the UK – five times the cost of the freshly minted CBR900RR Fireblade released in the same year.

PA HondaNR
The 1992 Honda NR750 ‘RC40’ cost five times the standard Fireblade

Apart from the 750cc V-4 oval-pistoned, eight-valves, two conrods per cylinder motor other notable features for the time were the inverted front fork, magnesium wheels, twin spar alloy frame and underseat exhaust.

PA HondaNR
1992 Honda NR750 ‘RC40’

Another interesting touch was the use of a mirror in the dash to show the LCD display at “infinity” so the rider didn’t have to refocus when checking the instruments.

PA HondaNR
1992 Honda NR750 ‘RC40’

Power was 125 hp at 14,000 rpm, with a dry weight of 223 kg, and top speed of 257 km/h.

PA HondaNR
1992 Honda NR750 ‘RC40’

This bike was bought new from Honda Spain by its current owner who has put some 3,000 kilometres on it. It is still registered and ridden.

PA HondaNR
1992 Honda NR750 ‘RC40’
PA HondaNR
1992 Honda NR750 ‘RC40’
PA HondaNR
1992 Honda NR750 ‘RC40’
PA HondaNR
1992 Honda NR750 ‘RC40’
PA HondaNR
1992 Honda NR750 ‘RC40’
PA HondaNR
1992 Honda NR750 ‘RC40’
PA HondaNR
1992 Honda NR750 ‘RC40’
PA HondaNR
1992 Honda NR750 ‘RC40’
PA HondaNR
1992 Honda NR750 ‘RC40’

Some MCNews.com.au archive photos below that feature the oval piston engine

Honda NR750 Engine
Honda NR750 Engine
Honda NR750 oval piston with dual connecting rods
Honda NR750 oval piston with dual connecting rods

Source: MCNews.com.au

Former AMA regular Short on the cusp of maiden Dakar podium

Factory Husqvarna pilot fourth with one stage remaining.

Image: Supplied.

Former AMA Supercross and Pro Motocross regular Andrew Short is on the cusp of earning his maiden Dakar Rally podium in just his second attempt.

The American, who transitioned to rally racing in time for the 2018 Dakar Rally after retiring from the AMA pro circuit in 2016, currently sits fourth in the classification with just one stage remaining in the gruelling event.

Despite sitting 34 minutes behind defending champion Matthias Walkner (Red Bull KTM Factory Racing), Short still stands a strong chance of podium success in the notoriously unpredictable race, which has seen numerous changes of the lead and DNFs amongst the leading crop of riders in 2019.

“There’s been a lot of chaos over the last few days,” Short admitted. “My plan from the beginning of this race was to just focus on my performance and try to be as smooth and consistent as possible. I’m happy to see my strategy is paying off. This fourth place in the overall is simply amazing.

“The moto start today was great fun for me. After the start, the terrain became a bit tricky and dangerous at some parts. There was a lot of dust and you really had to pay attention on the road book.

“That was stressful and there was this one waypoint at the end that was super tricky. The fatigue is setting in right now, but nevertheless I am really looking forward to reaching the finish line in Lima tomorrow.”

The Dakar Rally is currently led by Australian Toby Price (Red Bull KTM Factory Racing), just 1m2s separating him from Pablo Quintanilla (Rockstar Energy Husqvarna Factory Racing).


Source: MotoOnline.com.au

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