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Don't mess with carbs! They are now perfect and contributing nothing to issues. Look at and measure following areas:
- compression test, both plugs out, WOT when cranking
- little filter screen in fuel-inlet hose. Try running without it
- ride with gas cap open,any better? Do whistling gas-cap mod
- vacuum going to petcock. Make sure line isn't crimped when tank lowered
- use rubber-T and measure vacuum level at petcock
- petcock flow-rate. Aim fuel inlet hose into measuring cup. Apply at least 7 in.Hg
to pecock for 1-minute. How much fuel flowed into cup?
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