FS651V No High RPM

[Auto Doc's]

Hello Hayward51,

3600 RPM has been the industry "safe" standard for many years, anything much beyond that is asking for trouble. Yes, it can be done but why take the risk.

I managed to blow up a few "racing mowers" in my youth, several were rather explosive with internal parts finding their way out of the engine.

 

[txmowman]

I will check the valves and spray the exhaust today.

Don’t waste your time. If the engine otherwise runs smoothly, valve lash will not increase rpm.

 

[Hayward51]

Don’t waste your time. If the engine otherwise runs smoothly, valve lash will not increase rpm.

I've got it up to 3550 (no load) by my tach. I'm still puzzled why I'm limited RPMs after new rings installed. Valves were lapped and set during reassemble.

 

[txmowman]

A weak governor spring, damaged linkage or control panel, something in the wrong location. If it’s none of that, live with 3550. Governed engine don’t maintain a consistent rpm anyway, 50 rpm isn’t even noticeable.