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Intake valve clearance keeps increasing

Hi all, I've been having a strange problem with my SR125 motorcycle... I recently adjusted the intake valve clearance as the engine was very clattery and the bike hard to start. When I opened up the cover the valve clearance was way bigger than it's supposed to be, so I set it at the recommended clearance. This helped a lot for about 50-100 miles, but then the bike started displaying the same symptoms, so I reset the clearance again, which worked again for a while but now the valve clearance is back too open again... Wondered whether there is likely to be an underlying problem elsewhere on the bike? I'm a bit of a novice on this stuff, but really keen to learn. Any help much appreciated!

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  • Motorcycles Master
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When this kind of problem popped up on my Honda CB 360, I discovered (about the same time Honda did) the 'floating' cam was floating right up into the head ... a bad design. I doubt this is your problem but it is worth a look-see ... how are the cam bearings? review your work ... make sure you are doing exactly what you are suppose to be doing.

Posted on Jul 26, 2013

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