1980 YZ 250G Restoration

jeffcrew
Posts
3
Joined
3/30/2010
Location
Fort Collins, CO, USA
Edited Date/Time 1/25/2012 8:56am
Greetings all. I have been lurking here for months and you all have inspired me to restore my 1980 YZ 250G that I have owned since 1982. One of the best bikes I have ever owned and It's time to give her a little TLC.

It's been mostly sitting for the past 15 yrs and still fires right up with a little fresh gas. The main problem I have is that it won't stay in neutral . My plan was to split the case and go through the tranny, thinking it may be a bad shift fork, however before going that far I have removed the clutch and flywheel and checked the shifter assembly pins and cam etc. it all looks good and it shifts and stays in neutral flawlessly while spinning it by hand, so I am now thinking that there may be no need to split it. Does anyone have experience with the 250G transmission? Should I put it back together and hope for the best? or keep going and go through the whole tranny?

Any resrtoraton advice is welcome. I still plan to do the piston and rings, reed valve, carb, front forks, brakes, seat cover and plastic. Pics to come.
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captmoto
Posts
5892
Joined
4/22/2009
Location
Rancho Cucamonga, CA, USA
3/30/2010 4:05pm
If the shift fork is worn, you won't see it until it is out of the gear cluster. The fork may not let the neutral gear engage or disengage all the way. Also look at the shift cam ratchet gear to be sure it isn't rounded off. It works fine now but under a load it will act differently. I just had a 465 apart last month. It's not all that hard to work on. That bike is still one of my favs I've ever owned too.
Ozy
Posts
2267
Joined
4/1/2008
Location
USA
3/31/2010 7:43pm
jeffcrew wrote:
Greetings all. I have been lurking here for months and you all have inspired me to restore my 1980 YZ 250G that I have owned since...
Greetings all. I have been lurking here for months and you all have inspired me to restore my 1980 YZ 250G that I have owned since 1982. One of the best bikes I have ever owned and It's time to give her a little TLC.

It's been mostly sitting for the past 15 yrs and still fires right up with a little fresh gas. The main problem I have is that it won't stay in neutral . My plan was to split the case and go through the tranny, thinking it may be a bad shift fork, however before going that far I have removed the clutch and flywheel and checked the shifter assembly pins and cam etc. it all looks good and it shifts and stays in neutral flawlessly while spinning it by hand, so I am now thinking that there may be no need to split it. Does anyone have experience with the 250G transmission? Should I put it back together and hope for the best? or keep going and go through the whole tranny?

Any resrtoraton advice is welcome. I still plan to do the piston and rings, reed valve, carb, front forks, brakes, seat cover and plastic. Pics to come.
I had an 80 YZ250 and it was a great machine. Please post up some pictures
mx-frog
Posts
130
Joined
6/20/2008
Location
USA
4/1/2010 1:13pm
For plastic and seat covers go to vmxracing.com it's the nice shinny stuff!

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