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Sep 3, 2012 | 01:33 PM

Glockcubed

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Tourer

Joined: Sep 2011

Posts: 287

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From: SW Florida

Question for the Experienced

I appreciate the knowledge in this forum. Thank you. I have a question. I have just been tuned, bike is running great, no decal pop, 43 MPG, but I have noticed that when I am more aggressive on the throttle, I can make a back fire. Is this normal? Or should I have a "Fine" tune? Thanks for any input.

Sep 3, 2012 | 02:10 PM

Gliden

Club Member

Joined: Jun 2009

Posts: 5,323

Likes: 37

From: NJ

No expert but I don't think I ever had popping on throttle up. Or do you mean you get decal pop after closing throttle from higher Rpm's

Sep 3, 2012 | 02:13 PM

EasternSP

Seasoned HDF Member

Joined: Jun 2006

Posts: 30,875

Likes: 32,913

From: King George, VA

If you recently had it dyno tuned, you might take it back to yhe tu.er and let him figure it out. They shouldn't backfire at all.

Sep 3, 2012 | 02:13 PM

jackstrr

Road Warrior

Joined: Nov 2006

Posts: 1,671

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From: sequim, wa

something isn't right , timeing

Sep 3, 2012 | 02:14 PM

mkguitar

Extreme HDF Member

Joined: Sep 2010

Posts: 14,744

Likes: 402

From: Phoenix '53, '88, '09 Big Twins

back fire through the exhaust means that raw fuel is moving through the motor and collecting in the pipes ---this could be TOO MUCH fuel, which can be bad as the fuel can also "wash down" ( remove the lubricating oil) the cylinder walls

or there is a misfire and the spark is not firing or at the wrong time so air and fuel are just moving through the motor- in either case this should be fixed.

otherwise, what are you paying for...

Mike

Sep 3, 2012 | 03:29 PM

TickTock

Club Member

Joined: Feb 2007

Posts: 1,678

Likes: 3

Define aggressive. If you are twisting quickly and letting off, back and forth you can make it backfire. By mkguitar's definition above you can make it happen by opening, closing, opening, closing too fast. This would be because the ECM can't keep up with random craziness on the throttle.

Last edited by TickTock; Sep 3, 2012 at 03:31 PM.

Sep 3, 2012 | 04:35 PM

nytryder

Grand HDF Member

Joined: Jun 2008

Posts: 4,012

Likes: 298

From: Central Fl

In my world it's no big deal. I like to hear a little backfire.

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Sep 4, 2012 | 06:25 PM

FDHOG

Stellar HDF Member

Joined: Jul 2010

Posts: 2,275

Likes: 241

From: Highlands, NJ

Don't drive yourself nuts. I occasionally get a pop on the upshift between 1st and 2nd when I get on the throttle. Doesn't happen all the time, but the bike runs great otherwise. I had the bike dyno tuned by a reputable tuner.

Sep 4, 2012 | 08:16 PM

#10

Airborne350G

Club Member

Joined: Jun 2007

Posts: 3,435

Likes: 28

From: Living in open carry state :D

If you are only getting the pop when you are letting off the throttle you need to adjust your decel enleanment table. Real easily done if you have the software and cables.