As far as the RPM, your Jonsereds 930 spins over at 9,000 rpm. Jonsereds 2065 spins over at 9,000 rpm. Jonsereds 2171 spins over at 9,600 rpm.
Most chainsaws cut in the 6,000 to 8,000 rpm range when under load.
Interestingly, the Jonsereds 70 models spun over at 11,300 rpm. Very well built durable chainsaws. You just couldn't wear them out if you properly maintain them and ran the correct fuel ratio.
Sort of like the old Stihls 051, 056 & 076 models back then too. Not much composite plastic on those Jonsereds, Huskys and Stihls back then. They were made to work, be durable and cut wood. And yes, they weighed several pounds more.
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