Grubee Vs Flying Horse

I have Grubee 48cc and 66cc.

So, everythings good, but everytime I check plug, I shine flashlight down in jug, and notice that chrome lining in cylinder looks like it's chipping away?

So?..........but all runs good!
 
whew wheeeeee!!!!

i have the flying horse and just finished my 1st build with a grubee skyhawk. even with the carb issues on the grubee, i hit 37mph then i got scared on these narrow tires on my cannondale. this thing is every bit of what they say it is. i just need to figure out what my "no-low end" power issues are!!!!
 
if you have an air leak it'll run real lean and fast on flat land and downhill but have not hill climbing ability or torque, and eventually the piston will burn up or it'll start dieseling and seize or something. check for an oil leak on the engine block where the intake, exhaust, head, and spark plug all connect, and if its leaking replace the gasket and sparingly use high temp rtv paste.
 
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