Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I here you can make more power by adjusting the RPM higher. These engines are both 318 cc. Is the RPM set higher on a HMSK100? I here a lot about Hmsk100 throwing rods much more so than a Hmsk80. I want more power and have a chance to get a new Hmsk100. There is nothing wrong with my hmsk80 except it is 17 years old. Should I risk it? Is there and real benefit with a 10 hp unit vrs 8 ? Or should I just sell my old unit and buy a new one with more HP.

   No, don't bump the rev's on the HMSK80.  Many two strokes get a boost in hp by a rev bump but that should not be done with your
4 cycle HMSK80.  The rpms on the 80 and 100 are both 3600  and should stay there. 

  At least the way I remember is the block size is different between 80 and 100, bigger piston, beefier crank & etc.  I rebuilt 3 10hps and they were very different than 8hp's
   
   The 100 will get you a slight increase in power.