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Discussion Starter #1
My brotherinlaw has a JD/ JS63 that knocks on start up but smooths out pretty much at the governed speed. I took a look at it today and the c-shaft pin was sheared, so I replaced it and buttoned it back up and it still has the knock on startup. I'm thinking the c-shaft might be bent. If you guys have any advice or opinions they are greatly appreciated. Thanks
 

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You could remove the sparkplug and remove the blade and have someone rotate the crankshaft while you hold something near the tip of the crank stub to act as a point of reference to see if the stub is wobbling. Now if you happen to have a dial indicator and a magnetic base you could really see what's up.

Probably just a loose rod. My pushmower also knocks and smokes on start up. I'll run it till it blows. Actually, now that I think about it...It's been knocking and smoking less since I topped up the oil level with some Delvac. Maybe I should change the oil :)
 

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Thanks guys but after checking a little further it ended up being... a loose blade! He's not one to keep up with his OPE. He said he had stopped using it last year when it started knocking. Good thing!!! Thanks again
 
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