Mastermind
Work Saw Specialist
The popup VS flat top thing is still in the air........so I wondered if this could possibly help.....
The green line is a ported MS361 with a popup (I did not port it).
It makes MAX power of 5.028 HP at 10,000 RPM
Here is aMS261 I did with a flat top.
At 10,000 RPM this 50cc saw makes almost as much power as the 60cc saw with a popup at the same RPM......and even more power at every point afterward.
Not trying to cause trouble........I just really believe that flat top pistons will make more power than popups, and think this goes a long ways toward proving it.