RE: [Honda-C70] Testing for float valve leak from carburetor

Hotcomb: Have you tried putting a can or jar under the float bowl drain tube to see if that is where gas is leaking ? Or remove the 2 screws on the petcock & put that over a can or cup or jar to see if that leaks ? The only way I can think of to check the crankcase to see if gas MAY be leaking in is to look at the dip stick . See if the level is higher in a few days. The float bowl drain tube also acts as the drain for the float bowl vent/overflow tube. Pull the plug out of the bottom of the PCV drain hose . Not on the clean garage floor over a pan. You might get as much as a cup of nasty water/oil/gas from the intake & crankcase vent in there that could be the source of your gassy smell. Good Luck ! Baby Huey PS don`t forget to put the plug back in the PCV drain hose.

Date: Fri, 14 Oct 2011 19:55:33 +0000
Subject: [Honda-C70] Testing for float valve leak from carburetor

I have a strong gas odor and I suspect it is getting into the crankcase. Trying to figure a way to test for this? If I run the motor lightly until warm, leave the petcock on, then pull the oil drain plug and let it sit, will I eventually see gas come out the drain plug hole?

I have a clear fuel filter on after the petcock and it seems to me that even if I turn it off, with the filter and fuel line full, I can come back sometime later (day or two) and find air in the line. Between that and the smell I figure it has to be going somewhere.


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C70 Passport Not Running Right?
1970-73 C70 Honda Service Manual:
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1982-83 C70 Troubleshooting Guide: (scroll to sec. 20-28 page 205.jpg)

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