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high speed backfire

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Old Oct 31, 2010 | 09:20 PM
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g becker's Avatar
g becker
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Default high speed backfire
need help 49 in a50 frame 4th gear when I get to a steady speed starts backfiring.
 
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Old Nov 1, 2010 | 09:34 AM
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sqdealgeorge
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What carb ? Water in the float?
 
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Old Nov 1, 2010 | 08:09 PM
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new bendix new plugs set@.018 new points at.022 new plug wires and new coil,float is at a heavy 1/4",ajustable main jet.
 
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Old Nov 2, 2010 | 07:03 AM
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Did it backfire before you put the new stuff on or just start afterwards?
 
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Old Nov 2, 2010 | 09:35 AM
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Sounds like some minor tuning to me. Check your timing, check for intake leaks, check the colour of your plugs (white, tan, or dark) and make adjustments accordingly
 
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Old Nov 2, 2010 | 12:50 PM
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48pan
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Plugs should be set at .025 to .030. Backfiring through the exhaust or intake?
 
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Old Nov 2, 2010 | 07:25 PM
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It would hardly run before ,backfiring through the carb, plugs soot up . I have the idle jet at 1.5 turns out main at 4.
 
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Old Nov 2, 2010 | 07:48 PM
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Sounds awful rich if the plugs are sooting up....
 
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Old Nov 2, 2010 | 08:24 PM
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think I found an intake leak ,how hard is that to fix ?
 
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Old Nov 3, 2010 | 10:05 AM
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Are you still running the brass seals or are you updated to rubber orings ? If brass I would use hi temp silicone
 
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