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Originally Posted by Biker Mike  When I first installed my engine, it ran out great. As time and a few miles went by, it started missing at higher RPM's. I noticed oil coming from the exhaust gasket around this time as well. My question is, would a blown exhaust gasket effect high speed RPM? I have not torn into one of these engines yet and do not know what the reed valves look like (any pic's of valves?).  |
Change the plug too, NGK B5HS!... move the carb needle to LEAN (needle down, c-clip at top)Double check all wire connections, I like to use solder,(crimps vibrate loose)!
The exaust leak is NOT the cause, my whole pipe fell off in the street going home once & I lost the nuts, so I rode it home with NO PIPE & the bike never ran faster!!!
Another thing I do is adjust the gaps between the spinning magnet & the mag coil to make them equal. I noticed on a few of the engines that I bought the mag coil was WAY OFF. (almost touching)
I don't know if it helps?... but why not?
Also try a 25:1 mix & then a 30:1, see if that helps?