Backfire Upon Startup
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Cruiser
Joined: Aug 2005
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Backfire Upon Startup
I have an occasional very loud backfire out of my exhaust upon start up only after the bike has been sitting all day or night (8hrs). This may happen once every couple of weeks or may happen two days in a row.
Anyhow, what I'm asking is 1) Has anyone else had this happen to them? 2) Has anyone heard of any deffects in the ign systems? The bike runs fine otherwise.
05 FLHRCI, V&H duals/Ovals/Fuelpak/K&N air filter
Tourer
Joined: Oct 2005
Posts: 445
Likes: 1
From: East Tennessee
RE: Backfire Upon Startup
I've owned 2 Harleys one evo...one twin scam. They both did it occasionally. I've heard many Harleys do the same thing. Not to worry! I put 30,000 on the evo and have 22,000 on the twin scam so far with no ill effects. I always thought it had something to do with the duel fire ignition system...don't know or really care at this point.
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Cruiser
Joined: Aug 2005
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RE: Backfire Upon Startup
ORIGINAL: DragonNester
I've owned 2 Harleys one evo...one twin scam. They both did it occasionally. I've heard many Harleys do the same thing. Not to worry! I put 30,000 on the evo and have 22,000 on the twin scam so far with no ill effects. I always thought it had something to do with the duel fire ignition system...don't know or really care at this point.
I've owned 2 Harleys one evo...one twin scam. They both did it occasionally. I've heard many Harleys do the same thing. Not to worry! I put 30,000 on the evo and have 22,000 on the twin scam so far with no ill effects. I always thought it had something to do with the duel fire ignition system...don't know or really care at this point.
Road Master
Joined: Oct 2005
Posts: 1,012
Likes: 13
From: Fredericksburg,VA
RE: Backfire Upon Startup
rkoko164,
I have an 05 RG and mine does the same thing every once in a while and yes it is after sitting over night or all day at work. It runs fine afterward. Mine never did it before I added my PC III so I was going to call Fuel Moto and see what they think. I have also had a drop in fuel milage recently from 43 to 38-39. I'm not sure if the fact that it has cooled off here and the air is denser causing the ecm to adjust by adding fuel or if the PC III is acting up?????????
Let me know what you find out and I'll do the same.
I have an 05 RG and mine does the same thing every once in a while and yes it is after sitting over night or all day at work. It runs fine afterward. Mine never did it before I added my PC III so I was going to call Fuel Moto and see what they think. I have also had a drop in fuel milage recently from 43 to 38-39. I'm not sure if the fact that it has cooled off here and the air is denser causing the ecm to adjust by adding fuel or if the PC III is acting up?????????
Let me know what you find out and I'll do the same.
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Cruiser
Joined: Aug 2005
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From:
RE: Backfire Upon Startup
ORIGINAL: Thundercloud
rkoko164,
I have an 05 RG and mine does the same thing every once in a while and yes it is after sitting over night or all day at work. It runs fine afterward. Mine never did it before I added my PC III so I was going to call Fuel Moto and see what they think. I have also had a drop in fuel milage recently from 43 to 38-39. I'm not sure if the fact that it has cooled off here and the air is denser causing the ecm to adjust by adding fuel or if the PC III is acting up?????????
Let me know what you find out and I'll do the same.
rkoko164,
I have an 05 RG and mine does the same thing every once in a while and yes it is after sitting over night or all day at work. It runs fine afterward. Mine never did it before I added my PC III so I was going to call Fuel Moto and see what they think. I have also had a drop in fuel milage recently from 43 to 38-39. I'm not sure if the fact that it has cooled off here and the air is denser causing the ecm to adjust by adding fuel or if the PC III is acting up?????????
Let me know what you find out and I'll do the same.
Yeah. exactly! Seems like the cooler weather is bringing it back. The summer went by with hardly a pop. I was thinking a weak spark during cranking, the fuel keeps spraying and then finally a spark...."bang". I also drive a short distance to work thinking the pipes and engine is still in rich mode when I shut it off, so I've been taking the long way to and from work for the last week and it's been starting perfectly...until this morning..."Bang"...now the thinking cap is back on. Are you running duals?
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Road Master
Joined: Oct 2005
Posts: 1,012
Likes: 13
From: Fredericksburg,VA
RE: Backfire Upon Startup
rkoko164,
Yes, I am running V&H duals and Bassani mufflers, 95" Big Bore with SE air cleaner and PCIII.
I called Fuelmoto USA today and they told me that with the cooler weather that the air would be more dense causing the ECM to adjust to add fuel to the mixture which would explain my lower gas milage and they also told me that since the air is denser and the ECM is sending more fuel to compensate that it could be unburnt fuel from when you cut the bike off.
I am going to try revving up the motor once or twice just before turning the bike off and see if this helps on restart the next day. I guess the bottom line is the bike is getting more gas and apparently igniting the residual gas still in the throttle body form before you cut it off. I'll let you know how mine turns out after revving it up before turning it off.
Thundercloud
Yes, I am running V&H duals and Bassani mufflers, 95" Big Bore with SE air cleaner and PCIII.
I called Fuelmoto USA today and they told me that with the cooler weather that the air would be more dense causing the ECM to adjust to add fuel to the mixture which would explain my lower gas milage and they also told me that since the air is denser and the ECM is sending more fuel to compensate that it could be unburnt fuel from when you cut the bike off.
I am going to try revving up the motor once or twice just before turning the bike off and see if this helps on restart the next day. I guess the bottom line is the bike is getting more gas and apparently igniting the residual gas still in the throttle body form before you cut it off. I'll let you know how mine turns out after revving it up before turning it off.
Thundercloud
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