Hello all,
Well I finally got my H 30 together and got it running.. all I can say is after all the work I put into this engine I am disappointed with the power my little engine is making... or rather the lack of With an 18 x 8 prop I am getting 6300 rpm, with an 16 x 8 the results were about the same .....no big change in rpm. After reading alot of the post on engine conversion I guess I was expecting the engine to be turning around 8000 rpm. this is the newer version out of a yard broom leaf blower. This is the engine with the four small transfer ports but it does not have the hole in the exhaust port.I have done it all........big bore carb (11.11mm) bored out the hole in the intake manifold and port matched the intake side of the head, port matched the case, machined the back of the case to move the back plate as close to the crank pin as possible, machined the head to raise comp, set of rings from Frank Bowman (great rings,, make a big difference in compression) pitts muffler, CH syncro spark ignition. 30deg btdc....I have done some experimenting with the timing but this did not help. will try a different carb sometime this week and see what happens... If that doesent help I guess I am going to take the head off and machine the divider brtween the two transfer ports ( make one large port like the old style head) I havent given up yet If anyone has any Ideas pass them along....I will experiment alittle more and post the results (good or bad) latter this week.