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Old 10-31-2013, 01:09 AM
Nashville Kat's Avatar
Nashville Kat Nashville Kat is offline
Motorized Bicycle Elite Member
Join Date: Apr 2009
Location: Jacksonville, Florida
Posts: 1,403
Default Re: boosting compression? ideas?

I file the head down flat- I take all the ridge away that fits down onto the head gasket-
the normal ridge actually makes the head gasket have a smaller area of contact, and usually bends the head gasket onto two different planes

anyway, filing that ridge away takes a little bit of top cylinder space away, and with the same bore and stroke otherwise, increases compression- I could really feel the pop when I first did it

the head gasket is not compromised either in volume or squashed into two different planes, so in theory and probability at least, it should last longer and seal better.

I just got an odd extra 50 cc engine dirt cheap on ebay- the straight verticle plug head is ALREADY flat with no ridge- so I'm curious as to when it could have been made, and have no way to find out.

Last edited by Nashville Kat; 10-31-2013 at 01:12 AM.
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