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.

 

[MParr]

A little FYI. Clean and mark the throttle cable on both sides of the hold down clamp before loosening the cable clamp. When everything is hooked back up, you will only have minor adjustments to do.

 

[Auto Doc's]

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.

Hello Hayward51,

If this engine were on a generator, the exact high idle setting would be critical to maintain the needed 3600 RPM to and keep the generator steady at 60Hz output.

On a rider the difference of 50 RPM is not an issue.

Also consider that the engine is still breaking in new rings, so there will be a minor wear in period before the parts get into harmony with each other.