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1990 xt 600 won’t start 1990 xt 600 won’t start
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Alessio Corradini, on the Salar de Uyuni, Bolivia, of two locals

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Photo by Alessio Corradini,
on the Salar de Uyuni, Bolivia,
of two locals



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  #61  
Old 19 Mar 2022
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Well I guess I thought they were to tight and needed adjustment. So I guess I will start from scratch then and give it another try. So basically is that if I did it wrong then I can correct without damage correct. When I look at the cam I should be at the lowest point and at tdc instead of tdc at the highest. In the beginning I went by the manual not realizing the 2 different strokes. I just want to set that up and see where I am. Thanks
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  #62  
Old 19 Mar 2022
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So guys if I screwed up let’s get me back on the right track. Start from scratch. Now say everything is loose intake and exhaust valves. Which should I do first and to watch for as I rotate the flywheel. Basically what I am saying get me on the right track. Thanks for your patience everybody
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  #63  
Old 19 Mar 2022
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Originally Posted by njenduro View Post
So guys if I screwed up let’s get me back on the right track. Start from scratch. Now say everything is loose intake and exhaust valves. Which should I do first and to watch for as I rotate the flywheel. Basically what I am saying get me on the right track. Thanks for your patience everybody
Its not very complicated, if you adjustet on the correct tdc you turn 360 and check for play, if no play its ok. You write earlier adjust with play so you must have been on correct tdc, dont worry.
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  #64  
Old 19 Mar 2022
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If you did it wrong, yes you can correct without damage.
Another way to find the correct TDC is to remove the spark plug & put your finger in the spark plug hole, rotate the crankshaft until you feel lots of pressure on your finger through the spark plug hole. You are now on the compression stroke. Continue rotating the crankshaft in the same direction approx 90 degrees(1/4 turn) until the TDC mark appears. Then adjust the valves.

The rockers should be contacting the cam lobes at the lowest point, and at tdc. With the cam lobes facing downward.

Bob
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Last edited by Bobmech; 20 Mar 2022 at 22:30.
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  #65  
Old 20 Mar 2022
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Thank you for your patience. Usually I don’t panic but I normally don’t put a bike away if it’s not running. Unfortunately I thought basically a easy fix cause it just stalled out. Waiting for the coil to come but I want all this done before it comes. Still going to check the carbs again check the rubber diaphragm this time in case that has a tear and check the secondary jet.
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  #66  
Old 22 Mar 2022
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Update. The bike started when I put the new coil. Now the old coil tested good. Now just have to do the valves and see what happens. I will keep you updated on this. What I did notice is I installed a temporary fuel tank. I used a clear hose from the plastic bottle to the carb. What I noticed is that the fuel went into the carb and stoped. But there was a big air gap from the bottle to the carb like a air bubble, and there was still gas in the jug . Maybe there is something that is causing the bike to stall in the beginning. But changing the coil did start the bike. Is there any idea. Thanks again for your patience
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  #67  
Old 24 Mar 2022
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Originally Posted by njenduro View Post
Update. The bike started when I put the new coil. Now the old coil tested good. Now just have to do the valves and see what happens. I will keep you updated on this. What I did notice is I installed a temporary fuel tank. I used a clear hose from the plastic bottle to the carb. What I noticed is that the fuel went into the carb and stoped. But there was a big air gap from the bottle to the carb like a air bubble, and there was still gas in the jug . Maybe there is something that is causing the bike to stall in the beginning. But changing the coil did start the bike. Is there any idea. Thanks again for your patience
Bubble man now worries today? ;-) Sure it just came bubble up when carb filled up again, should be good to go now?
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  #68  
Old 12 Apr 2022
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Back on the road again. Ready to go all button up. Thanks for your help all. After all this it was the coil and I test everything. The coil tested good too.
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  #69  
Old 12 Apr 2022
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Great!
I have been following this thread - am no "expert" on XTs (have three, one a racer), but my 89 Tenere often worries me. I will start carrying a spare coil, thanks to your hard work, and the advice of the others.


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  #70  
Old 12 Apr 2022
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Originally Posted by njenduro View Post
Back on the road again. Ready to go all button up. Thanks for your help all. After all this it was the coil and I test everything. The coil tested good too.
I dont understand, it was coil and old coil was good?
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  #71  
Old 12 Apr 2022
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I purchased a new coil and adapter. The old coil tested good along with the adapter.
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  #72  
Old 12 Apr 2022
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Originally Posted by njenduro View Post
I purchased a new coil and adapter. The old coil tested good along with the adapter.
So the carb was the problem?
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  #73  
Old 12 Apr 2022
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Oops sorry old coil tested good but changed the coil anyway and it started. What I did through this headache was checked spark good, changed plug, used starting fluid still no start. Checked all connections and checked stator, pickup coil, and coil all tested good. Now took off carb all good. What I did was order up coil because i felt there was spark but maybe was not enough to ignite to start. After all that checked valves. Still no start. Coil came in and installed and started. To make sure that was the problem I installed the old coil and again it did not start. Put the new one in started right up. I read some where that you need real good spark to get these 690 started so I tried that for 100 bucks oem it did take 4 weeks to get.
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  #74  
Old 12 Apr 2022
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Congrats
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