1st2know
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Currently between Savages
Posts: 295
Seattle, WA
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The petcork is a major source of problems, including backfiring, poor idle, low gas milage.
There's a writeup here on how to convert it to Run-Res-Off just to eliminate these issues. It a few hours of work, but low cost.
The vac hose replacement is a quick fix that rules out a weak part.
The stock vac line to the petcork is basically a soda straw that wraps around the intake, runs along the head to the petcork. The throttle bumps in to it constantly, and over time, it develops cracks.
These cracks reduce the vac to the petcork, slowing the fuel flow and more air is allowed thru these cracks in to the cyclinder making the engine run even leaner.
The backfiring increases in both frequency and volume to the point whenever you shut the thing down, expect to see people duck for cover.
Yup, $2 of fuel line, some idle tweaking and no more backfiring.
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