quick questions for you guys - I have not seen anything in writing referring to the maximum rpm the new 103ci engine. It feels like valve float is happening but seems to be at too low an rpm.

Any thoughts.

Thanks in advance - Ray

You can actually compute that for yourself. You use the numbers for 'piston feet per second.' You'll have to do modern research as connecting rods, bearings, oil systems and overall metallurgy is better now than in my day.

For example, imagine a 'torquer' from Harley and a 'winder' from Honda. The Harley has a stroke of roughly four inches, and for easy figuring imagine the Honda has a stroke of two inches.

From TDC around one full cycle the Harley piston would travel eight inches, and the Honda would travel only four inches. At some point--and my memory is shaky here--I believe that engines usually fly apart somewhere at 3,200 to 3500 PFS. I need you techie guys to confirm that.

Obviously, you're never going to get anywhere close to that. I believe most bikes now utilize some form of rev-limiting.

But again, if memory serves, I remember a Honda or Suzuki making a 50cc four-banger that turned somewhere at 23,000 RPM. I don't think I've had Betty over 5,000 RPM.

probably 5750 or 6250, the rev limiter will kick in at that rpm. Valve float I could not see at all, the beehive springs do a good job and they are hydraulic lifters.