Back fire while starting a hot bike...

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Aug 29, 2010 | 11:11 AM

Avalanche123

Thread Starter

Cruiser

Joined: Jul 2010

Posts: 147

Likes: 0

From: Terrace, BC, Canada

Back fire while starting a hot bike...

New 2010 Fat Boy Lo. After a highway ride yesterday, stopped for about 10 minutes and then went to restart, as the bike started to turn over, I got this loud backfire so I stopped. Bike started no problem after that. Any ideas?
I recently had a stage one completed (SE Hvy Breather, V & H 2 into 2, and HD dealer download) done. I am wondering if the HD dealer download is the culprit?
Thx.

Aug 29, 2010 | 11:14 AM

chuckw2

Outstanding HDF Member

Joined: Mar 2010

Posts: 2,965

Likes: 384

From: SoCal hi desert

my WG does that sometimes but it's carb'd. No big deal I'd say. It starts ok after that.

Aug 29, 2010 | 11:16 AM

oldairboater

Ultimate HDF Member

Joined: Jan 2008

Posts: 7,476

Likes: 5

From: Republic of Texas

Not unusual. Short pipes and a just right mixture of gas/air with ignition. Both of mine do it on command. I use it to make people jump sometimes.

Aug 29, 2010 | 11:27 AM

yankeeflyer72

Road Captain

Joined: Jul 2008

Posts: 523

Likes: 1

From: Western Washington

Just a part of startin' a Harley. Oughta try a "Hot Start Backfire" on an old Panhead or Shovel with a kicker. Give you a whole new outlook on life, not to mention a 'Bad Knee' if it happens enough times.....

Aug 29, 2010 | 11:47 AM

Weakened Warrior

Tourer

Joined: Dec 2009

Posts: 282

Likes: 0

From: San Bernardino Mountains, CA

My bike does that as well. Kinda embarrassing sometimes...

Aug 29, 2010 | 01:05 PM

Other Sheep

Ultimate HDF Member

Joined: Feb 2008

Posts: 5,615

Likes: 9

From: Escondido, CA

You might consider installing a tuner. The dealer download doesn't do much for the a/f mix. It's probably running lean.

Aug 29, 2010 | 01:15 PM

nevil

Seasoned HDF Member

Joined: Jul 2008

Posts: 9,282

Likes: 1,139

From: southeast PA

It may be a little lean, but they do it now and then. Sure does scatter the chickens.

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Aug 29, 2010 | 03:59 PM

95th 1200

Road Master

Joined: Jul 2010

Posts: 1,045

Likes: 102

From: Waukesha, WI

Mine will pop too, I usually hold the throttle open slightly (1/4 turn or less) while cranking and it prevents it. Sometimes I do it on purpose to freak people out.

Aug 29, 2010 | 06:33 PM

#10

Avalanche123

Thread Starter

Cruiser

Joined: Jul 2010

Posts: 147

Likes: 0

From: Terrace, BC, Canada

Ok sounds normal then. I am a newbie so I appreciate the comments. I just want to make sure all was well with my new bike. I am going to consider redoing the mapping as it sounds that the HD dealer download isn't that great.
Thanks!