Kawasaki fr691v smokes badly

[The_Eric]

Maybe the throttle spring is stretched or weak and not strong enough to properly overcome the governors tendency to close the throttle? Or did you by chance mix two springs up?

 

[Japanese]

Yes. The inside governor arm i moved fully counterclockwise and then moved the outer governor arm attached to the throttle to fully open the carburetor butterfly which moves the outer arm counterclockwise. Then i tightened the bolt.

Check this procedure out before you rev the engine to its max. RPM.
Wiseco - Proper Motorcycle Engine Break-In After Rebuild

 

[football]

The issue i am having is when the governor is set per the manual the throttle stop for max rpm is backed all the way out and im still only getting 3200 rpm. The engines rated for 3600rpm and i want 3600rpm. And yes cub cadet rates the engines for 3600rpm as well for this specific machine.

No you dont. Mowers are not designed to run at 3600 RPM. Its too fast for the blades and will create blade speeds that are far past safe.

 

[Lawnman23]

No you dont. Mowers are not designed to run at 3600 RPM. Its too fast for the blades and will create blade speeds that are far past safe.

How did you come to that conclusion?

 

[The_Eric]

No you dont. Mowers are not designed to run at 3600 RPM. Its too fast for the blades and will create blade speeds that are far past safe.

That can be true of push mowers, but are you sure that applies to mowers that have a belt and pulley system to drive the blades? 3600 has been the standard for a long time on those mowers.

 

[joegreen]

Well cub cadet says it should run at 3600rpm and Kawasaki says it should run at 3600rpm. Anyway i got it to run at 3600rpm. I made an additional hole in the outer governor arm 1/8 inch higher for the carburetor butterfly link. This allowed the end of the outer governor arm to drop allowing more spring tension without affecting how the governor is set. When i did the math for the different pulley diameters from the engine to blades i should theoretically get 18,500 fpm blade tip speed. Measuring it with my laser rpm reader i get 18,400 so that is all good. Before with the engine rpm lower i was only getting 16,000 something fpm.

 

[joegreen]

I mowed with it today and it did great. Engine burns clean as a whistle. I am wondering though. It has a fairly decent vibration when the blades are engaged. More so than i think is normal. The blades are brand new oem blades so they should be good to go. The spindles feel tight with no slop. I will have to check the inner groove of the pulleys for debris next.

 

[Lawnman23]

I mowed with it today and it did great. Engine burns clean as a whistle. I am wondering though. It has a fairly decent vibration when the blades are engaged. More so than i think is normal. The blades are brand new oem blades so they should be good to go. The spindles feel tight with no slop. I will have to check the inner groove of the pulleys for debris next.

Try clocking the blades, one horizontal, one vertical and test. If same/no change, try setting both vertical or horizontal and test. With new blades and tight spindles it shouldn't matter but sometimes they can get into a weird rhythm and cause a pulse.

Also, with help, engage the deck and check out the pulleys, verify they are spinning smooth and vertically straight. Verify the belt is tight and not flapping excessively.

If everything looks good and "normal", it just may be the way she is.