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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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Old 22 Mar 2009
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Cause of noise in engine found

I recently posted a thread asking about removal of the access covers to adjust my rockers. I adjusted them and still no difference, still noisy as hell.

The noise was definately coming from the head area so I was at a loss as to what else it could be - then I took the head and cylinder off for a closer look and this is what I found.





The piston on the right is a spare I have to compare against.
Needless to say the cylinder is a bit of a mess and will need to be re-bored to be used again.
The weird thing is the bike wasn't hard to start or bad to ride it was just noisy.

I guess it was caused due to lack of lubrication - I had less than half the amount I should have had in the engine

Moral of the story is keep an eye on your oil level.
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Old 22 Mar 2009
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Oops! (runs outside to check own oil level)
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2006 XT660R daily ride, 1994 XT600E about to be reborn, Blog: http://goingfastgettingnowhere.blogspot.com/
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Old 22 Mar 2009
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Quote:
Originally Posted by BlackDogZulu View Post
Oops! (runs outside to check own oil level)
The was bike happy till I started doing 40 miles a day on the motorway. I guess going at higher revs for long periods didn't do it much good.

So don't assume it's OK - CHECK YOUR OIL LEVEL NOW!!!
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Old 23 Mar 2009
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Buggering shit bags that aint good!!!! What sort of noise was it? Im a wee bit worried now as my engine is a bit noisy, but I always figured that xt600e had noisy engines. It starts and runs fine, and Im pretty sure the oil is at the correct level. But it would be worth knowing how yours sounded. Good luck with it!
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Old 23 Mar 2009
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Originally Posted by yoashman View Post
Buggering shit bags that aint good!!!! What sort of noise was it? Im a wee bit worried now as my engine is a bit noisy, but I always figured that xt600e had noisy engines. It starts and runs fine, and Im pretty sure the oil is at the correct level. But it would be worth knowing how yours sounded. Good luck with it!
If it's a tapping noise you have - it's the rockers (don't panic!!!).
The noise was lower down than the head, it sounded like the small end had gone and the piston was banging about loose in the cylinder. It was worse when revved.

I've already re-built the engine with another piston and cylinder that I had lying about (like you do). I've just got to put it back in (when I have a spare couple of hours).
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Old 11 Apr 2009
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Ted, when you rebuild it and have honed it...... follow this guys advice.

Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

Basically, DO NOT RUN IN... hammer it. I thought he was talking crap too. but it makes sense.

have a read and see.........
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