Chookawatts
New Member
Hi Everyone, I need some help, I have almost finished my motorized bike, but after a few test runs it doesn't go as good as expected. First I'll give you the specs: 66cc china motor with SBP expansion chamber and jack shaft kit, Delorto 16.16 SHA carby, NGK B6HS spark plug .020 gap and i'm now testing .025 gap, Rocksolid engines reed kit, so called performance CDI, the one with the pretty red lead (I have ordered a jaguar CDI but it is on back order and hasn't arrived yet) and it still goes slow, just checked the head bolts today and found they had been done up by a finger and thumb wrench, so I torqued them down to 12lbs, Im not sure but I would expect my head gasket would be no good now if it wasn't torqued done properly but maybe it will be ok, this engine seems to be losing power pretty quickly, I'm still on the 16:1 ratio run in fuel and my top speed is getting slower and slower 53.7 down to 49.8 and now down to 47.4. I havent tested it with the head tightened yet but I cant see that making an amazing amount of difference without a new head gasket. bare in mind the engine is still stock standard no mods to barrel or head. it doesn't seem to rev harder, past half throttle, just revs nicely to half throttle and then stagnates. has anyone got any good proven advice for me?