Not often but...
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Cruiser
Joined: Aug 2008
Posts: 239
Likes: 0
From: Long Island New York
Not often but...
Sometimes when I start my 13 flhx I get a small backfire from my air cleaner. Doesn't happen often but had it happen 2 or 3 times this summer. Stage 1 kuryakyn hi-five Mach 2 air, powervision from fuel moto, Reinhart slip-ons
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
backfire from the intake in order of likelihood:
lean mixture
ignition timing too advanced
poor fuel pressure
bent valve/cam timing/pushrod out of adjustment/ bad valve seat...anything that would have intake valve not closing completely...this is not common... unless monkeys have been working on the cams or revving over 6200 rpms
probably nothing to worry about unless it becomes frequent, or interferes with safe operation ( like leaving from a light)
mike
lean mixture
ignition timing too advanced
poor fuel pressure
bent valve/cam timing/pushrod out of adjustment/ bad valve seat...anything that would have intake valve not closing completely...this is not common... unless monkeys have been working on the cams or revving over 6200 rpms
probably nothing to worry about unless it becomes frequent, or interferes with safe operation ( like leaving from a light)
mike
Road Warrior
Joined: Oct 2008
Posts: 1,692
Likes: 22
From: Denham Springs, La
If I start my bike and let off the start switch as soon as I hear the engine fire it'll sometimes stall and spit back through the air cleaner. It's never done that if I hold the start button down til I'm sure the engine is running.
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Mac daddy 103
Ignition/Tuner/ECM/Fuel Injection
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Aug 7, 2016 02:09 PM
