Unsolved mystery of carb bowl drain

[nachohouse]

I know this is an old post, but did you ever get to the bottom of this? Your original post and problem is what I’m going through on my ‘75 with a rebuilt ‘78 Aisan carb. Just wondering if you ever solved it on your 40?


Did you ever figure out the main source of your leak? If so, how did you solve it?


Were you ever able to fix the leak coming from the end of the shaft hinge?

The leaking for me from the primary throttle shaft is intermittent and mostly insignificant after monitoring it for several months. I removed the clip, smeared a little bit of permatex fuel resistant gasket dressing on the end, and replaced the clip. That seems to have totally stopped my seeping.

I also emailed Jim C (he rebuilt my carb several years ago) and he suggested running non-ethanol gas. Bowl drain is significantly reduced when I run non-ethanol and things seem to run better also. If it sits for a couple weeks and the bowl is low in the sight glass I usually just fill the bowl a bit through a vent hole in the top of the carb so it doesn’t have to crank as much. When I do that it fires first crank and will idle smooth right away. Hope this helps.