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1650 gas knocking sound


 
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cwilson
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PostPosted: Thu Jun 13, 2013 4:22 pm    Post subject: 1650 gas knocking sound Reply to specific post Reply with quote

I have a 1650 gas that has a knock. it is in the front of the motor I listened to it with a scope so im sure that's where it is. at an idle you cant hear it, from mid throttle to full throttle you can hear it loud and clear. when I listened to it with the scope it was loudest near the valve cover but you could also hear it down to the base but not nearly as loud. any thoughts on what it could be? thanks
 
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Massey farmer
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PostPosted: Thu Jun 13, 2013 5:18 pm    Post subject: Re: 1650 gas knocking sound Reply to specific post Reply with quote

I'm not saying this is it but, last year my 1800 gas had a little knock like that. It didn't sound like it was coming from a bearing in the bottom but it wasn't in the head. Turned out to be wrist pin bushings on two rods. From what I've read they can be a common problem as they were brass and after time ware out. Hope it helps
 
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kevinecwi
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PostPosted: Thu Jun 13, 2013 6:11 pm    Post subject: Re: 1650 gas knocking sound Reply to specific post Reply with quote

Once while I was green chopping with my 1650 the engine developed a knock/loud ticking. The problem was the thrust washer behind the governor was worn so thin that it was hitting one of the timing gears. Perhaps yours is doing the same thing?
 
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BradWi
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PostPosted: Thu Jun 13, 2013 6:49 pm    Post subject: Re: 1650 gas knocking sound Reply to specific post Reply with quote

sounds like wrist pin bushings,if it has some hours on it I would definitely check it out. there is an updated wrist pin bushing that is one solid piece that presses into the rod end vs, the originals that were 2 piece,one half in from each side with a gap in the middle for oiling, I have seen it where one side comes out and then the oil supply goes right out and ....rod failure
 
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cwilson
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PostPosted: Fri Jun 14, 2013 3:15 am    Post subject: Re: 1650 gas knocking sound Reply to specific post Reply with quote

thanks for all the help guys. i will look into these things. is it possible that i just need a valve adjustment?
 
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wilder11354
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PostPosted: Tue Jun 18, 2013 7:05 pm    Post subject: Re: 1650 gas knocking sound Reply to specific post Reply with quote

Check in carb throat, make sure choke plate has BOTH screws in it. if ones missing theres your knock, screws imbedded in piston top, and rapping on head.
 
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