Back fire through carb
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Joined: Feb 2019
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From: philadelphia
Back fire through carb
Hey guys so I got the bike all put back together and start it up it starts back firing through the carb sometimes with flames lol. The only way to keep it running is to throttle it otherwise it dies. I recently did the top end on it new jugs pistons and rings. I lapped in new valve and seals. I didn’t make any adjustments with the carb or cam or anything else. It did not do this before the rebuild. It’s a 1987 flhtc evo . Thanks in advance .
Road Master
Joined: Jun 2018
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From: Winnipeg
Did you increase displacement? Usually a sneeze out the carb is a lean condition. If you did increase- then id rejet the carb. If you didnt-Id recheck your timing.
but the manifold seal thing makes more sense.
but the manifold seal thing makes more sense.
Last edited by RDHIGH; Feb 18, 2020 at 04:27 PM.
HDF Community Team
Joined: Dec 2005
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From: NC USA
Did you get your voes hooked back up and vacuum hose connected to the carb?
If yes, you have a bad intake leak, probably where the rubber compliance fittings bolt to the heads.
If yes, you have a bad intake leak, probably where the rubber compliance fittings bolt to the heads.
Last edited by t150vej; Feb 18, 2020 at 04:29 PM.
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From: philadelphia
oh yeah I got that lol it was hiding under the seat when I took it off .
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From: philadelphia
okay will do. Not looking forward to taking the gas tank off again but I guess I’ll have to
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From: Anywhere we stop
I have a hanging 1/2 gallon lawn edger fuel tank that I like to use for "first startups"
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Road Master
Joined: Jun 2018
Posts: 757
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From: Winnipeg
Before you take the tank off-if you can find a small mirror and flashlight to look at the manifold and maybe you can spot something obvious-. If you can keep it running a bit- you can try spraying carb cleaner- or wd40 at the joints to note any rpm changes and try to narrow it down.
