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Unread 02-08-2020, 07:26 PM   #1
Not Yet Wild
Join Date: Nov 2019
Location: Michigan
Posts: 13
Default 1992 Columbia Par Car misfiring

So I have posted several issues before.
The starter would keep turning when I took my foot off gas pedal, New solenoid fixed that.
Muffler was blocked, I left full of Awesome cleaner all week, then through a combination of washing out and banging on a workbench I got a tremendous amount of carbon out. Now I can blow through it from my mouth with little resistance.
Previously it would not fire unless I kept the choke on full, I replaced the junk Chinese carb with a Genuine Walbro. Now it runs without keeping the choke on.

It has a new spark plug, new gas and although it runs it misfires really badly and periodically spits oil and air under pressure from between the bottom of the cylinder and the main crankcase. I thought maybe there was still too much back pressure from the muffler. I took the muffler off and tried it again and it still misfires. ( not sure if it was still leaking air/oil from cylinder/crankcase joint.)

It reads 120PSI on compression test

It has a new air pressure gas pump which provides a steady flow of gas back into the tank if you take the gas pipe off the carb. I can try an electric pump tomorrow. It uses pre mixed gas 85:1 mix.

OK guys what am I missing? what do I try next?

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