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Anyone else experiencing a lot of what sounds like top end noise and running a skirtless piston?



I have a 165 skirtless with a Tak +r head, S35 cam. I ran it 2 weeks ago at it's first race, and it seems like it was making a pretty noicable amount of noise from the top end. Ran it hard all day anyway, and no issues. Just changed the oil, and checked the valves, and everything is spot on. Still seems like it has a lot of noise to me. Valve lash is .04mm



Any help?
 

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Yes, they rattle a bit, more when cold, or if worn quickly from too-short of warm-ups. Keep an eye on the compression tester numbers and swap pistons when it drops 10-15PSI.
 
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