Saws that run at high revs without pressing the throttle have an internal air leak ( taking air into the engine via seals or gaskets rather than through the carb ) so you need to check, reolace the crank seals to start with.
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Saws that run at high revs without pressing the throttle have an internal air leak ( taking air into the engine via seals or gaskets rather than through the carb ) so you need to check, reolace the crank seals to start with.