I had to set the timing on the ty with Tallyho tobaaco papers. They actually measure up at .02 mm. No jokes please, that is how we did it

There are that many trials competitions around Australia. Trials clubs etc surely there is a recognized standard. This is what we require for you to compete. You require a tethered kill switch that is up to our standards. I would have expected most trials riders use the same one. I wouldn't of ...

Ty250 bored out to 71mm with a good wossner piston, slicked up with two stroke oil 125 psi. cold with throttle wide open without ever being started. I rode it down the end of the driveway & back it . Now what do I do ???
I tried to set the ignition timing 3mm before top dead centre + or minus .15mm ...

ty 250 Had a bent needle ? in the carb. It is true Yamaha tuned these engines & had Mikuni build a carb to suit. Well they didn't really build a carb. But there is a part that is unique to Yamaha that is no longer available
If Yamaha spent the time and money doing this, tuning a carb to their engine ...

The manual says 6:1 compression I read this as 6 times 14psi (atmosphere) = 94 psi. But I doubt this accurate. Have just pulled mine apart had 100 psi if I kicked it a few times. The piston rattles in the bore and there is almost 1/2 a mil of clearance. Have ordered a 71.0 Piston & will get it bored ...

Been trying to teach the 13 yo kid how to ride & found an 8 km circuit close to home. It is GOOD. One half of it is down hill casual here you go puddles with both ends washed out enough to prevent any but the serious 4wd er. The second 4km is back up hill adventure, starts in mud, goes through a few ...