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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Engine Rattle
Post Info TOPIC: Engine Rattle
AndrewM


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Engine Rattle
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Got any idea what this rattle is? (see youtube link below). Its only there when the engine has warmed up.

I have just fitted a new timing chain and it the same. It has also had a rebore and new piston. I have check the valve clearance and they seem ok.

 

https://youtu.be/P4QQPBIFY24



-- Edited by AndrewM on Saturday 2nd of January 2016 02:47:54 PM

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peteBLUEttr


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A lot of people report a slight rattle after a piston and rebore..

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Pete. South Somerset, England.
AndrewM


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Do they just leave it? Does it get any worse?

The engine is a made up with parts that have not heard any of it run before.

The bottom 1/2 came complete with a bike I bought which was meant to be good, it had a receipt from a bike breakers. The head and barrel was from ebay.



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TTRfan


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If the little end was good then I think your next step is to re-check the valve clearances as there may have been a bit of "bedding in" with the head you bought.

It is surprising how much noise the valve gear can make and these days I tend to err towards the tighter end of the gap specification range.

Brian



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AndrewM


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re-checked valve clearance inlets are between 0.10-0.15. Exhaust one was a 0.3 redone now to 0.20(might be a bit under) the other is 0.20-0.25.(Only got gauges that go in 0.05 steps)

Rattle still the same.



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L16MHU


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Mine has a similar rattle been like it no problem, when I go round the miss's il get a video

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AndrewM


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Tried a 2nd head that I know doesn't rattle and its exactly the same.

 



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