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TOPIC: Re:Backfiring
#234604
paramedicp (User)
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Backfiring 4 Years, 9 Months ago  
So i just installed Krome Werk slip on pipes. They sound great when i throttle up and in low gear but when i am crusing in a high gear they seem to backfire. Anything out there that can fix this?
 
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#234611
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Re:Backfiring 4 Years, 9 Months ago  
Can we assume that you haven't disabled or removed your AIS?



Rich
 
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#234615
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Re:Backfiring 4 Years, 9 Months ago  
Yes, I removed my AIS last week before getting the new pipes.
 
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#234618
PapaTom (User)
I said 4 quarts.
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Re:Backfiring 4 Years, 9 Months ago  
You want to make sure there are no air leaks between the headers and the Khrome Werks. Be sure the everything's tight, even where the headers are fastened to the exhaust ports. Mine will pop a little when I decelerate from 1st, 2nd or 3rd, but not much.

You may have to adjust your PMS a little, if nothing else helps.
 
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Last Edit: 2009/11/01 19:18 By PapaTom.
 

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#234651
paramedicp (User)
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Re:Backfiring 4 Years, 9 Months ago  
Cool, i will try these things. Thanks and if anyone else can think of anything let me know.
 
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Re:Backfiring 4 Years, 9 Months ago  
I had the same problem. I had stock pipes and punched them and then had my bike re jetted because of a K and N air box. I also removed my AIS. I then bought a new set of Khrome Werks for a Road Star. I had severe backfiring and popping. I recently put my stock pipes back on. A mechanic friend of mine said that the Khrome Werks probaly needed the carbs to be rejetted but he was unsure of the correct jets to use. So for now I am stuck with the stock pipes.
 
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#234666
PapaTom (User)
I said 4 quarts.
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Re:Backfiring 4 Years, 9 Months ago  
Shouldn't need to rejet just for slipons or swapping out the OEM pipes entirely. Stock mufflers mute the popping due to re-routing the exhaust with the baffles and pipe configuration. Like I said earlier, a little adjustment of the PMS might be needed, but not usually. Once I removed the AIS 99% of the popping stopped for me.

Rejetting is necessary when the air intake is opened up, like with a BAK, or drilling more holes in the stock airbox, etc.
 
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#234718
paramedicp (User)
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Re:Backfiring 4 Years, 9 Months ago  
I think it is the pms, the exaust does have a fuel smell to it. I first noticed it when i drilled out my stock exaust to a stage 2, but didnt have a problem with popping.

Riding into work this morning in 40 degree F was very cold but i noticed it was popping when i was sitting at lights. Not alot about every 5 sec or so there was a small popping.
 
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Last Edit: 2009/11/02 10:37 By paramedicp.
 


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#234802
paramedicp (User)
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Re:Backfiring 4 Years, 9 Months ago  
So reading up on some on the popping posts here on the forums, people said they clamped off the tube leading out of the carb to the ais, which i removed. I did not clamp this off and had no idea i needed to, could clamping this off get rid of the popping?
 
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#234815
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Re:Backfiring 4 Years, 9 Months ago  
paramedicp wrote:
So reading up on some on the popping posts here on the forums, people said they clamped off the tube leading out of the carb to the ais, which i removed. I did not clamp this off and had no idea i needed to, could clamping this off get rid of the popping?

There are no ports on the carb itself that have to be plugged. One port is for fuel bowl vent, the other is the plastic 90 degree tube that is for the slide chamber vent, both stay open to air. With AIS removal there is a vacuum port on the manifold that has to be capped. at 40deg it will take a good ten minutes for the engine to be fully and properly warmed. Gas does not atomize as well in cold temps, hence you are in a slightly leaner condition until engine is warmed, you might want to try turning out the pilot screw 1/8 to 1/4 turn, this will provide a little more gas to have a chance to atomize. Also keep in mind that some pipes will pop more than others.
 
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