oliver 1650 engine trouble

cody w · Jul 10, 2013

i have a 1968 oliver 1650 gas. it has a knock in the motor at mid throttle on up. everyone on here told me it was most likely wrist pins. but i discovered the spark plug in the number 1 cylinder was loose and stripped. it is a bigger plug so i assume it was drilled and retapped years ago. the compression is blowing right by no matter what i do you can hear it loud and clear especially when you start it and shut it off. this cylinder is where i hear the knocking. could this be the cause of my knock? if i take the muffler off the sound almost goes away but if i put it back on it comes right back. any thoughts?

mechanicfred · Jul 10, 2013

See if you can get a spark plug thread repair kit.

Dick W. · Jul 10, 2013

Install a heli-coil in the spark plug hole. It might be 18mm thread size.

hd6gtom · Jul 11, 2013

Cody the local NAPA store should have a kit complete with thread cutter to cut new threads in the head then you install a threaded sleve in the hole using Locktite. I've done several and never had the sleves come out. I like them better than heli-coils. The knock could be the loose plug, carbon buildup, wristpin, etc.

Anonymous-0 · Jul 11, 2013

Thanks guys

oliver 1650 engine trouble

cody w

New User

mechanicfred

Member

Dick W.

Member

hd6gtom

Well-known Member

Anonymous-0

Well-known Member

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