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Old 09-26-2017, 03:03 PM
1QwkSport2.5r's Avatar
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Location: Cottage Grove, MN
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Originally Posted by aspeed View Post
Just by reading the OP. Four washers is kind of a lot. Maybe the piston cyl. is just fine. Could just need a new plug, or less shims or something simple.
I was told that 3-4 shims in these engines is common for using typical 1/2a fuel with 20-25% nitro. From the reading I've done, these engines with 0-1 shims is suitable for 5-10% nitro.

The piston seal is not the best and compression is not very good. I will pull all but one shim out and check it again.
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