Who doesn't like a hot rodded chainsaw? This old Pro Mac 10-10 was in need of a revival and ripe for modifications! I also needed a saw with a longer bar, so adding a little more power would help with pulling more chain. Picked the saw up for $20, sometimes the cheapest ones cost you the most...
Once getting into the guts of the engine I found some unique porting configurations, not what one normally sees in a snowmobile or dirt bike. Seems that chainsaws like this have some unique parameters to work around, mainly lack of a tuned exhaust and a need for low end torque. These pro mac saws are already a pretty hot saw from the factory, the carburetor is huge for a 54cc saw as is the intake! The exhaust was the most restrictive part of the setup, which is where we concentrated our efforts on.
I may actually tear into it again at some point, didn't go too crazy with extending transfer or exhaust durations, you can always take away more material later on! Timing changes are also worth looking into more. But that was the point of this project, to get into something that is a bit unknown and have some fun learning.
Негізгі бет Pro Mac 10-10 Mod, The HACK-10 Project
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