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Bilge Rat

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That chamber looks like the grooves on a 45rpm record from years past.
Just let the grooves fill with carbon for more compression/power.

Maybe a round nose carbide tool bit run light and fast to clean it up.

Going to teardown the 3rd 4-mix motor for rings/seals today.
I have found 2 weak coils out of 4 of these motors.
They are easy to work on but it is not interesting at all.
On the plus side the owner lives 200 yards away and has a larger bobcat with many attachments, 2 3/4 ton and 1 1 ton truck that i can use
when needed.
 

MG porting

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MG porting

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IMG_20180819_113645.jpg Did another Chinese cylinder this one I'm thinking about giving this to a Ope member who would like to have a hotrod 660 but haven't decided yet or not because I might put this on one of mine don't really need it but I'm weird that way. Lol.
 
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