Advanced Search

I remember dads YG1T & it stripped the center drive out of the fiber rotary valve--which we did a few of at work--& i just screwed a reed petal off something yamaha straight over the inlet hole & left the rotary disc off, probably just had the steel center bit in place as needed for spacing crank gear. It worked ok just gutless but for him it was usable until i got a disc.

Your options are limited if you can't burn it out. Look down the tail end where you removed the end muffler & see if there's an obvious restrictive build up visible & poke it out & shake it out. I put my end muffler in the enclosed log fire & does a good job. Any engineering shops around that could get away with smoking things up. Have you checked the cylinder port--exhaust port. Unlikely, but small motors ie small ports build up around the port edge & have seen little yamaha 80 YG1T almost blocked off after years of farm use.--as i say, unlikely but!!. Burn the tail muffler out too if you go to an engineering shop.

Thanks, yes the blocks under will eliminate needing an extra set of hands and sounds like my best bet...Just slow and easy but not to easy

Looks like it's almost there. Need a good strong flywheel holding tool to add some force to it but looks like you'll have to unbolt the cylinder & put blocks under it. Turn the crank to lift it all up, fit blocks then force the piston down. But it looks a bad case i must say. but might not be much rust lower down as piston is near the bottom. No use trying to turn the nut & needs more force than that. Here's a link to ages ago on my YG1T. The old girl ran perfect using same piston & rings. Might be a page before or after showing more. Can see the holding tool & had a pipe on that too--pretty brutal free or bust job. I can see the pipe looking again, but slid it out longer & thought something was going to break or shear a crank key, then felt a slight movement, so then other way, then see saw back & forth until it freed up. In saying that i think mine was more corrosion into the bore where yours is gross rust & lots of it. Also yours is on first oversize but i'm sure you've seen that.
www.yamaha-enduros.com/index.php/forums/...ildforums=1&start=60

Gone are the days of RD350's & the like where they had grease nipples in the end of the swinging arm bolt & a hole in each bush steel sleeve so the grease go everywhere. Trouble was though that people would see a grease point & pump till it came out somewhere after pushing any seal or Oring in the end cap out of the way. First YG1T's had nipples on the brake cams & was a disaster with Mr Farmer & his grease gun haha. Worst thing with bikes is when no grease is wiped on the swingarm bolt so can't even get the arm out--hence what i had to do the other week. It's all a worry isn't it!!.