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HELP! Irvine .40 MKII really low compression

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HELP! Irvine .40 MKII really low compression

Old 07-16-2019, 02:48 PM
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Default HELP! Irvine .40 MKII really low compression

I just got what appears to be an unrun engine, but the comp is really low. Its a ringed engine. Glow plug is tight. Its been a long time since I had a ring engine. Are they supposed to be like this?

Last edited by TampaRC; 07-16-2019 at 03:44 PM.
Old 07-17-2019, 02:23 AM
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A little oil should bring it up to par, then a little running will make it great. It's very likely a Dykes ring and will always feel soft on compression.

Last edited by Hobbsy; 07-17-2019 at 02:33 AM. Reason: Add picture
Old 07-17-2019, 11:56 AM
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Run it.
Should run fine.

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