Whats the difference in a Tecumseh HMSK80 and a HMSK100 Original Message Nov 5, 2017 5:32 pm
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.
Location: Marlboro MA
Joined: Dec 8, 2007
Re: Whats the difference in a Tecumseh HMSK80 and a HMSK100 Reply #1 Jan 11, 2018 8:55 pm
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