20 Most Recent kawasaki Fh641v 21hp 21 Hp Riding Lawn Mower Engine () - Page 8 Questions & Answers

0.10 ? 0.15 mm (0.004 ? 0.006 in.)

use some sort of lube like silicone spray

Just push it back in

.025

Could be several causes, BUT... failing bearings from not enough oil added to gas is the first thing that comes to mind..

May have run out of gas, or one of the safety switches is out of adjustment and shut the mower down.

If your oil level is okay, meaning it's not to full, Check your spark plug to see if it has oil on it. If it does, you may have some cracked rings on the piston. This would allow air to be forced into the crankcase and blow oil out.

check make sure blade brake kill is not engaged causing no fire

Does it 'BOG' down when attempting to engage blades?

Best blades to use would be gator blades from orgegon.

Hope this helps, good luck. I’m happy to assist further over the phone at https://www.6ya.com/expert/layne_0fccff498c319c32

Your throttle plate and or governor arm may be out of whack. Download a technical service manual in a pdf off the internet and follow the instructions on how to set them. Be sure to put a 6mm pin or bolt in the hole while adjusting. You want to set your governor arm prior to setting the throttle plate. I had the exact same issue on mine and that was the resolution. Good luck and be sure to set your rpms correctly for high and low speed idle. Again the technical service manual will provide info on how to do it all. They sell a little hour / rpm gauge on ebay or amazon for like 15 dollars where you just have to wrap the wire around the plug wire 4 to 5 times and it will read your rpms. :)