Tom Gardner wrote:

I have a new 3.5hp (I think) "Works" largest 14" chainsaw that I want to
use the motor for a project. I need to know the RPM. I've had no luck
researching this and I no longer have an RPM meter. I imagine all
chainsaws have similar rpm. I need to get the ratios on timing belt
sprockets close to optimal. If this works, you will all be dazzled by
my brilliance!

The RPM at what point? Under load? Tht's going to be tough unless you can
rig up a brake or drive a pump with a restricting valve.

Just driving the chain? A couple of people have proposed some methods.

Under no load? Be careful. If it's a shunt wound or permanent magnet motor,
it will be OK. If it's a series wound motor, there is no theoretical maximum
RPM and it could be damaged by overspeed.

--
Paul Hovnanian
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Plaese porrf raed befre postng.