Need Help, Backfiring problem
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6th Gear
Joined: May 2010
Posts: 11
Likes: 0
Need Help, Backfiring problem
Just picked up an 04 1200 custom yesterday. Looks and runs ALMOST right. Looks like previous owner installed some bassani sweeper pipes (which are almost too loud if you ask me) and a K&n high flo. The air filter does not look like the SE one. It's circular/conical and maybe 4 or 5" diameter.
After riding about a 100 miles of owning the bike, it's starting to back fire when RPM's drop when in neutral and revving up OR on decelleration. Some minor blue flames come out of the exhuast on the backfire. Brought the bike to NewRoc Harley in NY and their mechanic drove it around the lot for 15 seconds and said it looks like it may need a carb re- cleaning or rejet? I don't know how sure he is b/c he wasn't able to look at anything else. I'm reading on the boards that this crankcase position sensor may be an issue, replacing air filters, carbs, etcc.. I have no idea where to start.
After riding about a 100 miles of owning the bike, it's starting to back fire when RPM's drop when in neutral and revving up OR on decelleration. Some minor blue flames come out of the exhuast on the backfire. Brought the bike to NewRoc Harley in NY and their mechanic drove it around the lot for 15 seconds and said it looks like it may need a carb re- cleaning or rejet? I don't know how sure he is b/c he wasn't able to look at anything else. I'm reading on the boards that this crankcase position sensor may be an issue, replacing air filters, carbs, etcc.. I have no idea where to start.
Road Master
Joined: Nov 2007
Posts: 1,083
Likes: 5
From: Berwick, Pa
If running pipes with no baffles or restrictions, you will get a lot of deceleration popping. It will sound like a jake-brake at times. It is very annoying to most people, however some riders seem to think it's cool.
(see 3 posts down 
)
(see 3 posts down )
Last edited by kahaone; May 31, 2010 at 03:36 PM.
Intermediate
Joined: Dec 2009
Posts: 27
Likes: 0
From: North Olmsted
After the plugs/carb cleaning your planning to do,check the exhaust flanges...make sure the pipes are mounted to the proper torque specs...
Had mine get a bit loose,and the end result was popping on decel...that little exhaust leak by the cylinder head was the culprit...
Had mine get a bit loose,and the end result was popping on decel...that little exhaust leak by the cylinder head was the culprit...
Club Member
Joined: Feb 2007
Posts: 16,320
Likes: 306
From: Boynton Beach, FloriDuh
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Road Master
Joined: May 2010
Posts: 823
Likes: 1
From: Lost Angels
No blue flames on mine but does pop occasionally on decel. No popping on neutral or accel. I like it, sounds like gunshots. Which makes me blend in while riding in LA.
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