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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Cam chain alignment
Post Info TOPIC: Cam chain alignment
danpass15


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Cam chain alignment
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engine was making a rattling noise so took the engine casing off and had a look inside. do you think I need a new chain?



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JOHNYBOY


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check for backlash from crank to cam is there any

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TTRHead


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Take the tensioner out and see how far at the end of its travel it is

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devon_rich


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Brian's rule of thumb is in this thread, looks like your TDC marks are not in alignment:

ttr250.activeboard.com/t59506155/how-much-free-play-on-a-cam-chain/

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mossproof


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I would change it. It's definitely stretched a bit so needs doing, plus it will take out one possible cause of the rattles. It's a more daunting task to think about than to actually do! Just be methodical, and there's plenty of instruction on here if you're unsure of anything.
Good luck,
Simon.

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danpass15


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Thanks for all the replies peeps! Gonna get a new chain on order and replace it

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