03-19-2017, 08:12 PM | #1 |
Not Yet Wild
Join Date: Jul 2009
Location: Mechanicsville Va
Posts: 62
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1990 CC gas knocking
Knocking. more gas you give, the louder it gets. It's been rebuilt several years ago and has knocked for the last 10 yrs. my buddy acquired it a year ago and we have fixed most of the gremlins. He was told it was the clutch. I said it wasn't, but I rebuilt the clutch, no difference, swapped with another clutch, no difference. decided to pull motor down. rod bolts were tight, removed rod cap and it has score marks in it. crank appears to have a little score. Is this a known problem? looks like we need a complete rebuild kit along with a crank? The part I don't understand is that there is a little play side to side on the rod at the crank. Can that be causing the knock? it looks like the rod has potential to float side to side making knocking noises?
Anyone have advice? a good flathead crank cheap? Is he better to try and find a clone? My buddy is on an extremely tight budget and I'm trying to help him out the best that I can. Thanks, Troy |
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03-19-2017, 09:43 PM | #2 |
Gone Wild
Join Date: Dec 2009
Location: Corpus Christi, TX
Posts: 1,644
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Re: 1990 CC gas knocking
I have the same year cart and the flat head engine is a turd...
I'd swap it out with a clone |
03-20-2017, 06:00 AM | #3 |
Photoshop Guy
Join Date: Aug 2012
Location: Canal Fulton, OH
Posts: 3,846
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Re: 1990 CC gas knocking
Your issue is a common one with these old motors as they age. It's not to say that these motors are bad motors (I run one), but over a period of time (usually decades), the crankshaft journal begins to get egged-out and the knocking begins. Yeah, your rod bolts will still be tight, but that doesn't mean anything in this situation. Once the rod gets loose enough, it begins banging against the inside of the crankcase at the back side of the motor below the starter/generator until it finally breaks from the crank.
When I got my cart it had a blown KF82 engine after knocking for awhile. Here's my thread that has pics of the carnage: http://www.buggiesgonewild.com/gas-c...oval-kf82.html And here's a relatively inexpensive option for rebuilding that I explored at one point: http://www.buggiesgonewild.com/gener...s-georgia.html (I didn't end up having my motor rebuilt because I found someone locally with a running KF82 motor which solved my problems) |
03-20-2017, 12:54 PM | #4 |
Gone Wild
Join Date: Mar 2015
Location: Montville,Ohio
Posts: 177
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Re: 1990 CC gas knocking
check it with a strip of plastigauge material,available at any good auto parts store.That will tell you your clearance
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03-20-2017, 09:48 PM | #5 |
Not Yet Wild
Join Date: Jul 2009
Location: Mechanicsville Va
Posts: 62
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Re: 1990 CC gas knocking
Taking Springbok's advice, I called J&M carts in Georgia. For 165.00 they will machine the crank and rod. Boxing them up tomorrow to send to them. I'll also buy a gasket set and piston and rings. That should take care of it.
Thanks !!!! Troy |
03-21-2017, 05:54 AM | #6 |
Photoshop Guy
Join Date: Aug 2012
Location: Canal Fulton, OH
Posts: 3,846
|
Re: 1990 CC gas knocking
Awesome! Please let me know how it works out and maybe even post some pics of the parts when you get them back. I still have my old original motor and may have that work done at some point.
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