decel popping
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Road Captain
Joined: Feb 2009
Posts: 502
Likes: 0
From: lone grove, oklahoma
decel popping
I recently installed the pc-v with an arlen ness big sucker purchased and mapped from fuel-moto. I am happy with the performance gains but the bike now pops on decel more than it ever did before, now I'm no mechanic but I've always been told that popping is a symptom of an improperly tuned engine, is this true and if so should I have the pcv remapped?
Tourer
Joined: Aug 2007
Posts: 404
Likes: 1
From: Northshore in Massachusetts
popping means the air fuel mixture is too lean, check the plugs if white and ashy then it's too lean, if any of the electrode on the plug is melted don't ride it until it's retuned or you'll soon be burning a hole through the pistons..
Road Master
Joined: Jul 2008
Posts: 1,142
Likes: 7
From: Michigan
some of the decel popping can be fixed by adding fuel at the 0% throttle position, i did this and it cured the decel popping. As others have said, make sure all your exhaust connections are tight as well.
Road Warrior
Joined: Nov 2008
Posts: 1,955
Likes: 7
From: The Great Northwest
DECELL POPPING
Decell popping is caused by the detonation of unburnt fuel in the exhaust pipe. This happens with high flow exhausts that allow more fresh air to be pulled into the pipe, causing the exhaust temperature to rise and detonate the fuel. Ways to reduce and possibly eliminate this popping are:
1. Block off fresh air injection systems. This will reduce the air being fed into the pipe, causing the higher temperature.
2. Adjust the fuel table to remove fuel during decell. Highlight from 2000rpm to redline in the zero percent column. Insert a 40 to 50 into the cells. Rev the bike and see if the popping has reduced or stopped.
3. If it is still popping try a +10 to +15 instead of the negative numbers. The added fuel will cool the exhaust so it wont pop. But to much added will have anoticeable effect to the fuel mileage.
4. Do not do any changes at 1500rpm; this may effect how the bike idles.
5. Sometimes going to the ignition table and advancing the timing 3 to 5 degrees can help too.
1. Block off fresh air injection systems. This will reduce the air being fed into the pipe, causing the higher temperature.
2. Adjust the fuel table to remove fuel during decell. Highlight from 2000rpm to redline in the zero percent column. Insert a 40 to 50 into the cells. Rev the bike and see if the popping has reduced or stopped.
3. If it is still popping try a +10 to +15 instead of the negative numbers. The added fuel will cool the exhaust so it wont pop. But to much added will have anoticeable effect to the fuel mileage.
4. Do not do any changes at 1500rpm; this may effect how the bike idles.
5. Sometimes going to the ignition table and advancing the timing 3 to 5 degrees can help too.
Road Master
Joined: Jun 2009
Posts: 795
Likes: 1
From: Douglasville, Ga
I recently switched from a V&H Fuelpak to the PCV that I bought from FuelMoto on my 07 RKC. I had decel backfiring and FuelMoto had me change the settings in increments of 5 in the first column. I settled with +10 from 1750 to 6500 rpms and the bike runs great! no more pops or backfiring. The best it has ever run. Never could get the Fuelpak right.
D.J.
D.J.
Road Master
Joined: Jun 2009
Posts: 795
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From: Douglasville, Ga
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Joined: Jun 2007
Posts: 86
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From: Ft Bragg, NC
Locodude, I recommend you email Jamie Long at FUEL MOTO - give him your configuration- provide range when you get Decel-they responded with a new MAP- loaded it up via the computer DYNOJET software- Mo Better.
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Outstanding HDF Member
Joined: Feb 2008
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From: Sunland, CA
i have the arlen ness unit and also have a little popping some times anyone know
what setting for the arlen ness unit i should have it set at thanks to anyone
with the same set up sreaming eagle mufflers and air cleaner-ride safe
what setting for the arlen ness unit i should have it set at thanks to anyone
with the same set up sreaming eagle mufflers and air cleaner-ride safe
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