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XT600E 1995 won't start XT600E 1995 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.
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  #1  
Old 19 Jul 2010
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XT600E 1995 won't start
I have changed my piston kit about 2000km and everything was ok.
In the last trip it start to cuts off engine shortly very rare when I was using engine break and after that, accelerating it's cutting off and then runs great. When idle sometimes just cuts off. After a few hours of checking in the middle of nowhere it's starting and keep cutting off from time to time when accelerating. After a while I run out of battery, i supposed the regulator broke down and I started the bike with the backup regulator and i managed to get home.

The next day i went to see if it is still cutting off and yes, it starts to cut off badly and it wont work in lower RPM only in higher. After a few minutes died.

So now, my XT won't start, i have check everything i know:

compression (ok)
timing points (ok)
check the valve clearance (ok)
check spark (spark plug, pipe, ignition coil, pick-up coil) all ok
clean the carb

everything was like in the service manual

So i bought a timing strobe and I have noticed that the spark ain't within the |-| mark.

see the pdf attached


May the problem be TCI?


I have posted a video too here:

YouTube - MOV00181.MP4

Please HELP!
Attached Files
File Type: pdf Yamaha XT600E Ignition Mark.pdf.pdf (784.6 KB, 405 views)
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  #2  
Old 19 Jul 2010
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damn, I have no clue! :confused1:
Good luck with that!

The weirdest thing is that I didn't hear any sound coming from the cylinder...
Is the piston going up and down?

Vando
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  #3  
Old 19 Jul 2010
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Could it be that the camchain skipped a tooth?
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  #4  
Old 20 Jul 2010
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Quote:
Originally Posted by bacardi23 View Post
damn, I have no clue! :confused1:
Good luck with that!

The weirdest thing is that I didn't hear any sound coming from the cylinder...
Is the piston going up and down?

Vando
You didn't hear the piston because I removed the spark plug to get easy to turn for the starter.
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  #5  
Old 20 Jul 2010
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Quote:
Originally Posted by Jens Eskildsen View Post
Could it be that the camchain skipped a tooth?
I have checked that too, it's where it should be.

This days I will try my TCI on another bike and get back to you all.
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  #6  
Old 20 Jul 2010
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hmm try to see if rubber joints between carbs and head are intact.

They r made of rubber and metal melted together, but when they get old air beginss to pass inside.... remove carbs and joints, and check them carefully
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Old 20 Jul 2010
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I,d be tempted to agree and go for the cam chain out by a tooth,did you allow for the cam chain tensioner moving the chain when under tension.? also did you set it up counter rotating the engine ?.......
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  #8  
Old 20 Jul 2010
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The bike ran for 2,000km after reassembly so unless the camchain jumped, and kept on jumping to cause the earlier intermittent problems, that is unlikely to be the problem. All the symptoms point to an electrical problem and as the strobe test indicates that the timing is out then the workshop manual's suggestion to check the pick up assembly appears logical.

All the best.
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  #9  
Old 20 Jul 2010
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Vote for electrics too.

Eleminate the side stand switch an check aigain!

Check also ignition lock, battery connections and ground connections to engine and frame. Healthy battery?

Good luck!
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  #10  
Old 20 Jul 2010
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its 100% electrical. if the timing hd jumped, you would have noticed a really HORRIFIC rattling and a lot of unfriendly noises.

check the neutral switch, and kickstand. usually the two are in line so if one fails, motor doesnt run. a faulty kickstand switch is a probable culprit too, since those usually do suffer a lot more abuse and vibration/beating than say, the neutral switch.
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Old 20 Jul 2010
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Cant see why it should be the neutral switch, the bike would run and start witout it, you just need to pull the clutch when starting.

I rode for a year with one working from time to time, it had a mind of its own. Changed it no so long ago and it was sticking.

Hope you get you're problems sorted out, I guess everything is fair game, go over the whole bike.
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  #12  
Old 20 Jul 2010
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You can be just one tooth out and the bike will still run and not cause any short term damage.

Not always, but sometimes.. Depends on the bike and which way it's out.

It does sound electrical to me. Are you sure you're coil is ok ?? Is the spark strong and constant ??
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  #13  
Old 21 Jul 2010
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I have checked the ignition coil, the pipe, the pick-up coil and other switches. The spark is nice big and blue.
The spark get to the plug without problem, in the video I have removed the spark-plug and put on the cylinder so I can see when it's sparks. Anyway, the strobe WONT work if there is no spark present to the spark-plug.

I will keep you all posted.

THANKS A LOT for your help.
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  #14  
Old 21 Jul 2010
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Should have read the opening more carefully.

So if the bike now doesn't start at all - check flywheel position on crankshaft and wodruff key. Can be that the pick-up signal to ignition is now on wrong timing due to loose or position moved flywheel.

Good luck
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  #15  
Old 22 Jul 2010
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Could also be the CDI/ECU unit...

I wouldnt just go and buy one though. Do you know anyone who you can borrow one from ???

The ignition advance could be screwed up..
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