@RMM,
Not trying to argue, but Honda lists its 390 cc as net 11 hp.
Honda Power Equipment: Honda Generators, Lawn Mowers, Snowblowers, Tillers
@All
Not to steal the thread, but does anyone make a flywheel that can handle higher RPM's and still be able to use the Honda 20 amp charging system? :shrug: I don't care about racing, I would like to build a fat tire bike around the 420 Predator, add on the Honda 20 amp charging system (cheaper to do this than buy the Honda 390 with the charging system) and get additional performance out of it. The only problem is that the couple of places I have looked at performance parts for the 420 cc engine do not have flywheels that can be used with a charging system (I guess because most people building up these engines want to race them). I'd like to be able to keep the starter, run lights and have a 12V outlet. Not looking for 10K rpm capability, but getting to 5K or 7K rpm would be about what I would be looking for.
Paul