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I like Jonsereds thesis better with low rpm and bigger rim to get same chainspeed. There is a lot of negative stuff that comes along with high rpms. Easily avoided with a bigger rim. Reason that most don't increase chain speed in transmission is that the engines are lighted and running lean =...

Thats OK, I won't ague it either then. Is it blue or black ignition? I got some lists from SEM a while back that raised these questions. Since no one really care about top rpm it is of little importance. It is the speed in wood, under load with said hp output that is interesting. I ran a lot of...

This is hard to believe if it has original ignition as the ignition is not capable of delivering sparks faster than 15 000rpm according to SEM (manufacturer of the ignitions)

When Oregon introduced X series chain There was a lot of bar tip thrown chains as the cut out in drive link was not there so it tried to ride up on sprocket in bar. I got a bunch of that chain, but returned all of it. I threw chain a couple times when first testing that bloody thing. I get...

Saws today has less power stored in weight, less power in low rpm and lower torque so it is harder for them to hold higher loads than older saws. Instead they have higher rpms and acceleration so chain speed is still around 20-21m/sek even though they have 7 pin. The Jonsered 400 series had...