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I would have to agree ignition is EVERYTHING. Some other factors are most of the cylinders, pipes and port timings tend to be built around a snowmobile style. What I mean is all this stuff is really designed around a targeted rpm not around a usable power curve for a transmission based engine. Another issue is these engine are built specific and are only built by a few people so the R&D is minimal not like a cub cylinder.

Lastly ALL THE OLD 2 stroke" TECH" (transmission based) is based on small displacement engines. I'm not saying its wrong but they are just guidelines and starting point rules of thumb none of it was designed for these large cc engines. This is why everyone looks to the snowmobile world because they have been dealing with these large cc for along time and they making great power already.
 
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