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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> How much free play on a cam chain?
Post Info TOPIC: How much free play on a cam chain?
mike220


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How much free play on a cam chain?
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As per the title really, how much is ok when measured vertically in between cam gear's ?

 

Been checking mine today to try and trace a noise after a top end rebuild. Video link to show mine below :

 

TTR cam chain freeplay: http://youtu.be/o4xLjuALU-A

 

For those who have knowledge of the inside of their motors, is this normal or do I have a chain/tensioner issue ?

 

Thanks for looking,

 

Mike



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Cubber


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Mike, take a look at this clicky  HERE and read the details - especially where it tells you about head replacement. wink

I would also check the cam chain tensioner before anything else though. aww

Martyn



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mike220


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Yes I did refer to that guide during the work Martyn. Can chain tensioner appears to work fine, does pick out etc. but it's impossible to know whether the 'force' exerted is to specifications of not.

I really need someone who's seen a 'good one' to tell me whether this is in spec or not. Someone must know if it's too much ?

Mike

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TTRfan


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My rule of thumb is to look at how the timing lines on the camshaft sprockets align with the head. They should look like this i.e. parallel to the head casting:

Removing_TTR_head4.jpg

 

If the chain is worn then the lines are over at an angle as shown in the photo below:

Cam chain worn.jpg

 

There is a guide to replacing the timing chain here.

Brian



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Exeter, Devon, UK

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