Did you install the 155cc kit?
What kit was it if so? Flat top or domed (high compression)
Was the head shaved at all?
You might want to not keep revving it that high. The valve springs aren't that strong and valve float does occur in these. Which results in bent valves from kissing the piston.
__________________
My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
|