Yamaha Circuit Magazine: TY Range

Text from Yamaha Circuit Magazine, from 1977, Issue 4, detailing the 1978 Yamaha range:

 

 

YAMAHA TY250, TY125 & TY50

For 1978, Yamaha have a three-machine trials range headed up by the well- proven TY250, the machine developed by Mick Andrews, double European Trials Champion, and used by hirn to win such classics as the Scottish Six Days Trial.

The TY250 lines up alongside another popular Yamaha trialler, the TY125 that combines performance with lightweight for those trials riders who prefer to utilise a favourable power to weight ratio rather than outright horsepower.

Finally, there's the little TY50M ... a little jewel of a trials bike in miniature with a 3.2bhp 50cc engine featuring reed valve Torque Induction, Autolube oiling and a four-speed gearbox.

The Yamaha TY50M might be a lightweight in terms of engine size, overall dimensions and horsepower but it’s very definitely in the "heavyweight“ class when measured in terms of its "go-anywhere" capabilities.

The little TY50M is a genuine trials machine, capable of tackling many of the same sections as its bigger brothers in the Yamaha trials range. Just like the rest of these machines, the TY50M draws on the experience of double European Trials Champion, Mick Andrews, and this experience is reflected in the machine's styling and specification. It's no “boulevard" bike posing as a trials machine ... the TY50M,  while quite happy cruising the cafes, is quite capable of dealing with the rough stuff.

For off-road enjoyment, trail riding, novice-class trials or even as a snappy little street bike, the TY50M brings the real excitement of a genuine competition machine to motorcycling's smallest category. 

Yamaha Brochure: YZ TT IT TY

Yamaha Brochure from c1983:

YZ490    YZ250    YZ125    YZ80

TT600    TT350/250    TT225    IT200

TY250    TY125

Enlarged view of the Yamaha TY125

Enlarged View of the IT200

Yamaha DT / TY / XT Brochure

Here's a higher res image of the TY page from the brochure below.

And this is the text from the image:

Yamaha TY Series. . . With the Balance and Performance to Win Every Trials Event

Yamaha’s great new Trials models, the TY125 and TY250, are the result of Yamaha’s engineering skills as well as all of the experience and knowledge of one of the world’s top Trials riders, Mick Andrews. Every engineering feature and styling point has won his critical approval after severe tests. Lightweight and highly manoeuvrable, and with exceptional balance capabilities, these machines will meet and exceed the requirements of even the most demanding Trials rider. Yamaha has with these machines once again taken the leadership in motorcycling technology, combined it with unexcelled experience, and shown the way to the champion’s circle.

Engine

The Yamaha Trials series models are powered by engines especially developed for this gruelling test of man and his machine. Single- cylinder, 2-stroke design - a technology where Yamaha excels with scientifically determined piston design painstakingly matched to induction and exhaust ports. Low-speed power and instant response are superb to meet the demands of even the toughest sections. And, of course, Yamaha’s exclusive Autolube lubrication system assures a precisely measured quantity of clean oil from a separate tank thus assuring the maximum efficiency of the charge of fuel drawn in for every firing stroke. Add to this the proven worth of Yamaha’s Reed-Valve Torque Induction system, and you have the best possible Trials engine, with the finest possible performance.

Speedometer

Street-legal speedometer has been especially mounted in a well-protected position behind the left fork strut.

Transmission

The widely spaced gear ratios (5 for the TY250 and 6 for the TY125) have been carefully engineered to assure perfect performance at any speed—not only in competition in the sections themselves, but also for road and trails between sections. A feature worthy of special attention, moreover, is the gear change pedal which folds back when hit by rock or tree stump, assuring the rider that the machine will never be knocked out of gear.