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Author Topic: M90 Re-thinking 2nd O-ring Removal ?  (Read 2451 times)

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Re: M90 Re-thinking 2nd O-ring Removal ?
« on: December 06, 2020, 09:01:33 pm »
Quote from: 70Rcode on December 05, 2020, 02:09:16 pm
Noticing the popular recommendation of 2nd O-Ring removal for lube issues, after Very lite below piston cylinder wall ptfe oiling , noticable exhaust smoke for minute or so running until clears up. That indicates Good inter-O-ring oiling between  o-rings into combustion chamber past both o-rings ...If oil lube IS migrating past & lubricating Both o-rings into combustion chamber, what benefit justifies running a single O-Ring other than the very slight frictional issue ?

Most of these cannot get any oil in between the two o-rings. In short order the engine bogs down some and some even squeak and comes to a complete stop after a short run. Removing 1 o-ring completely solves this. They are now shipped with 1 o-ring (in a large part because of me). Earlier production had two of them. In addition I was able to run an M90 non-stop for 4 hours and 56 minutes on a single fill up. I wish I still had that engine!
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