K241 Won't idle -- FIXED

[rmaynard 15,965]

Just rebuilt (if you can call it that) my Carter carb off of a K241AS. When I say "if you can call it that", I am referring to the very limited Kohler rebuild kit that includes a gasket that goes nowhere, a bowl gasket, float valve and seat.

I removed and cleaned the idle fuel adjustment, main fuel needle and jet. I soaked and cleaned the carb body. Reassembled, set the needle valves to initial book settings, and started it up. It started right away after the bowl filled.

However, there was a lot of popping and misfiring. Before I did anything else, I cleaned and regapped the points to .020", cleaned and set the plug to .025".

I restarted and set the speed to fast and adjusted the main needle valve until the engine ran fairly smooth. Then I returned to idle and it quit. There does not seem to be difference wherever I set the idle needle valve.

I removed the carb, re-cleaned everything, and check the needle valves, reassembled and it does the same thing.

I still get popping and misfiring at high speed, and no idle.

So I took the carb off my B-100 K241S. Without changing anything, I installed it on the K241AS and it runs fine.

What am I doing wrong with the other carb, or where should I look next as far as a clogged port or something?

Help.

Thanks guys. I know someone will have the answer.

Bob

[piecrazy4 0]

Sounds like the idle passage could be plugged or you could have a loose throttle shaft making it loose vacuum. Causing it to not get fuel? Maybe you should try disasembling it again and blowing out the passages with compressed air.

[rmaynard 15,965]

Maybe you should try disassembling it again and blowing out the passages with compressed air.

Done that three times already.

[The Toolman 22]

What about all the little holes at the top an bottom of the high speed needle? I had ta run a real small needle thru mine to open'em up so it would idle.

[rmaynard 15,965]

What about all the little holes at the top an bottom of the high speed needle? I had ta run a real small needle thru mine to open'em up so it would idle.

Check & double check. That's been done.

I am going back to the old float valve and seat. I did not try to run the engine before installing a new valve and seat. I am going back to the old one to see if there is any improvement.

Bob

[rmaynard 15,965]

FIXED!

Thanks to T-Mo and his link to carburetor rebuild, (Carburetor 101), I discovered that the large needle valve was clogged INSIDE. The little holes were open, but between the top holes and the bottom holes, the passage was blocked. I soaked in 99% alcohol, and sucked on the tube until air passed. Sounds crude, but it worked.

Thanks again to T-Mo for posting a comprehensive rebuild tutorial.

Bob

[W9JAB 156]

:USA:

I soaked in 99% alcohol, and sucked on the tube

That's my hobbie to! :D