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Friend gave me a project

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5dracing:
A friend of mine gave me a project bike to work on for him. It's an 87 TT 350 Yamaha. Anybody ever worked on one of these? I believe it will need total top end rebuild. When I started it it smoke a blue trail.

alan:
I would do a compression check before you deside to open up the top end! I would also drain any and all old fuel out and put in some fresh with proper mix!

Alan

Ps Keep us posted!

JDRooster:
TT350 is 4 stroke, no mixing required. I'd check the valve adjustment before I rebuilt the top end. It could be that the valve seals are rotted out and it's getting oil from there, especially if the compression is good. Check the seals and adjust the valves. The TT's were great playbikes. The forks are weak but otherwise alot of fun. My best buddy had an 86 TT600 and that thing was a monster back in the day!

alan:

--- Quote from: JDRooster ---TT350 is 4 stroke, no mixing required. I'd check the valve adjustment before I rebuilt the top end. It could be that the valve seals are rotted out and it's getting oil from there, especially if the compression is good. Check the seals and adjust the valves. The TT's were great playbikes. The forks are weak but otherwise alot of fun. My best buddy had an 86 TT600 and that thing was a monster back in the day!
--- End quote ---
OOOPPSS! I forgot they had 4 strokes back then! :oops:

John:
Smoke from low rews = valve seals, smoke from high rews = piston rings. Open the oil refil plug and check for "crank compression". if it's blowing it needs fixing.

//John

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