high speed backfire
Oct 31, 2010 | 09:20 PM
Thread Starter
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2nd Gear
Joined: Oct 2010
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high speed backfire
need help 49 in a50 frame 4th gear when I get to a steady speed starts backfiring.
Nov 1, 2010 | 09:34 AM
Joined: Dec 2007
Posts: 1,854
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From: Eagle River WI
What carb ? Water in the float?
Nov 1, 2010 | 08:09 PM
Thread Starter
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2nd Gear
Joined: Oct 2010
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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.
Nov 2, 2010 | 07:03 AM
Joined: Jul 2008
Posts: 4,270
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From: Central Virginia
Did it backfire before you put the new stuff on or just start afterwards?
Nov 2, 2010 | 09:35 AM
Joined: Oct 2010
Posts: 566
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From: rural ontario
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
Nov 2, 2010 | 12:50 PM
Joined: Mar 2009
Posts: 260
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From: Fort Worth, Texas
Plugs should be set at .025 to .030. Backfiring through the exhaust or intake?
Nov 2, 2010 | 07:25 PM
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2nd Gear
Joined: Oct 2010
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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.
Nov 2, 2010 | 07:48 PM
Joined: Sep 2010
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From: Albany, Oregon
Sounds awful rich if the plugs are sooting up....
Nov 2, 2010 | 08:24 PM
Thread Starter
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2nd Gear
Joined: Oct 2010
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think I found an intake leak ,how hard is that to fix ?
Nov 3, 2010 | 10:05 AM
Joined: Dec 2007
Posts: 1,854
Likes: 20
From: Eagle River WI
Are you still running the brass seals or are you updated to rubber orings ? If brass I would use hi temp silicone
