as opposed to gas and water, oil and gas do mix, so you won't see a difference other than very runny oil. Probably a combo of bad fuel valve and or bad float valve in the carb.
--- On Fri, 10/14/11, Hotcomb <firstname.lastname@example.org> wrote:
From: Hotcomb <email@example.com>
Subject: [Honda-C70] Testing for float valve leak from carburetor
Date: Friday, October 14, 2011, 3:55 PM
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.
[Non-text portions of this message have been removed]
1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw
1970-73 C70 Troubleshooting Guide:
http://tinyurl.com/6ebwtw (scroll to sec.7.1 page 101.jpg)
1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c
1980-81 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec.18-1 page 170.jpg)
1982-83 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec. 20-28 page 205.jpg)
1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn6
1982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
More resources for C70 Passports and Cubs: