Loud backfire BANG! on start

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Sep 16, 2014 | 08:08 AM

Keithhu

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Seasoned HDF Member

Joined: Sep 2009

Posts: 17,148

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From: SE Michigan

Loud backfire BANG! on start

Folks, this happened to me twice in a week, curious to hear your thoughts. Both similar circumstances, in fact it happened in the same location both times.

Details:

- First, I start with a 45 minute ride, starting on suburban surface streets ending on country roads then parked at a restaurant in a small town

- Bike stopped for 45 minutes to an hour while I eat

- I'm done eating, on the first start attempt, bike turns over for a few seconds, then I give up thinking I'll try again. As soon as I let off the starter switch - BANG!, and I mean a LOUD backfire bang (not a compensator bang).

- I wait a couple seconds, try again, starts right up, no issues

The first time it happened, I just chalked it up to a random thing. Then a week later it happened again, also started right up on the 2nd attempt.

Any thoughts on this one?

Sep 16, 2014 | 08:11 AM

batman.

Road Master

Joined: Jun 2014

Posts: 1,219

Likes: 63

From: westland Michigan

Ok ill ask. Is there a tuner on it? Whats been done to the bike? All stock? These are other details peeps are gonna need also.

Batman.

Sep 16, 2014 | 08:12 AM

E8USMCRET

Seasoned HDF Member

Joined: Mar 2014

Posts: 15,365

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From: NC, USA

My 07 SG did that once in my driveway. So loud I thought someone would have called the police for shots fired. Never did it again. My Stator went out months later, not sure if the two were related. That's all I have to add. Good luck.

Sep 16, 2014 | 08:17 AM

MikeZ

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Joined: Jul 2011

Posts: 648

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From: New Jersey

Maybe you should watch what you eat there to avoid such aggressive flatulence.

Sep 16, 2014 | 08:23 AM

inkdemon

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Joined: Oct 2009

Posts: 642

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From: cumming

THats happened on my bike when it sits long enough(a few day)in a hot garage. Guess the line needs to be pressurized. And when it does the second attempt I would think maybe to rich ? Just throwing straws out there. But it has never caused any issues.

Sep 16, 2014 | 08:39 AM

Badlionsfan

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Joined: Jun 2014

Posts: 77

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From: Cuyahoga Falls, Ohio

My new to me 09 EG did this the other day for the first time. Only thing I did different than any other time was it was in gear with the clutch pulled, not the way I normally start a bike. I'll be curious to see if it does it in neutral at some point.

Sep 16, 2014 | 08:55 AM

Jackie Paper

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Joined: Mar 2010

Posts: 38,592

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From: Honah Lee

Mine is bone stock and has always done it stock. Did not do it with open python exhaust. For an explosion, it has to be vapor. What I am saying is if there were any wet fuel, it would not do it. So in my mind , it must be a total vapor. Probably couple drops of fuel vaporized by heat. Hit the start and lights it off in exhaust pipes. I left work one night at 12:30AM. Two police were across the street looking down an alley for someone since it appeared something had happened at a corner bar. I hit the starter since and bang. One officer jumped back and almost knocked his partner down who was rolling in laughter. Sure am glad they were laid back . Guess the only real problem is if you have a weak rusty exhaust.