Page 1 of 1

Choke cover leak - help!

Posted: Thu Nov 21, 2019 11:25 pm
by boeing7873
So after 3 years of chasing an idle and low RPM issue, I got to the conclusion that it was related to a lack of fuel at that rpm range. Lack of fuel meant no power/stall until rpms reach 1300-1400, then all normal.

I managed to eliminate the stall by pulling out the idle mixture screws way out of range, about 2 to 2.25 turns out, and increase my idle fuel jets to 60 and decreasing the air restrictors (jets) to lowest.. I believe 110.

But winter came and symptoms started to show just a little, and I hate the smell of such a rich mixture. So I went again on the chase for a vacuum leak. Spraying all type of combustible gases and fluids did not help. RPMs never changed enough to recognize a leak.

So finally today I went with the other leak detector, the smoker. And... surprise! First, I thought my carb shaft/bushings were ok, well all except one that likes to smoke. But the real surprise was the smoke coming out of my choke covers. I changed the paper gaskets recently but obviously this must be an uneven base or cover.

Anyone with experience with this problem and what is the best solution?

Re: Choke cover leak - help!

Posted: Sat Nov 23, 2019 10:27 am
by 4x4Pinz
it happens when people over tighten the screws and bend the housing. A problem when folks take on their own work without knowing fully what they are doing (guilty as charged). I have learned over the years that when dealing with a soft metal and a gasket to keep the torque on the fastners to a minimum and use a gasket sealer. good thing is this plate can be made flat again and a new gasket with sealer used to fix the issue.

Re: Choke cover leak - help!

Posted: Sun Dec 01, 2019 8:35 pm
by boeing7873
Both covers were pretty bent. I heated them and with soft and small hammer and vice pressure, managed to get them quite close to flat, then a little sand and both look good now.
Now back to ground zero: re-jetting, re-idle, re-synch, re-timing... :{