I changed oil and filter in the 1641 this morning. This engine has always seemed like it ran faster than the 1863 but I thought it was because of the different engines. Anyway while I was fooling with it I got out the tach and checked the no load RPM. It was 4300. I found in the service manual how to adjust it down but never did find what it was supposed to be. I adjusted it down to 3600. Anyone know what it's supposed to be?
Cannon
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