C90 Se - Motorcycle-Journal Forums

pdawkins · 05-13-2008, 07:46 PM

Just installed new cobra short pipes and am having trouble with the bike backfiring on deceleration. Anyone know how I can fix this problem.

Thanks

Paul

Kodatech · 05-13-2008, 09:13 PM

Disable or remove you pair valve. If that doesnt work you are going to need a powercommander or similar device. Check the torque on the head bolts. 17in/lbs is the spec. Did you use new gaskets?

Do you have a powercommander?....If so I have a map that WILL FIX the popping/backfiring as long as all of your other things are in order....meaning NO exhaust leaks.

I am running cobra speedster slashdown pipes on mine. If you get a powercommander let me know and I will email you the MAP I am running. None of the standard maps are 100% perfect. It took me a few hundered miles, and the help of another C90 rider, but I got my bike running PERFECTLY with NO backfiring.

redeye · 05-13-2008, 10:29 PM

hi not to highjack this thread but. I just got my c90 and it also has the cobra pipes and supposedly the powercommander and it still backfires. any help would also be great. i do not know if the pair valve is removed or not.

Kodatech · 05-13-2008, 11:06 PM

wich cobra pipes do you have?...I have speedster slashdowns and a K&N filter...I am running a custom map and it does NOT pop at all.. email me if youwould like to try the map for your own bike Yomamma75@hotmail.com

frostbitevinnie · 05-14-2008, 04:50 AM

Quote:

Originally Posted by redeye

hi not to highjack this thread but. I just got my c90 and it also has the cobra pipes and supposedly the powercommander and it still backfires. any help would also be great. i do not know if the pair valve is removed or not.

Do you have naked jugs on the right side of the bike??? Metal lines coming out of you right side pair valve cover??? If so then it is not removed. For a kit go to C90 Boulevard

You have a lean condition. Pair valve is only one solution the other is to find exhaust leaks and add a fuel processor. If interested, redeye or pdawkins, I have a fairly new Cobra fi2000r for an 05 to 07 C90, $100 shipped. Good deal bro!! Check for a PCIII first though. Under the left side faux tank cover on the front of the frame.

redeye · 05-14-2008, 05:15 PM

i will have to get ahold of the dealer were the p.o. bought the bike to see what type of pipes they are and what exactly they did to the bike.

frostbitevinnie · 05-14-2008, 05:46 PM

Quote:

Originally Posted by redeye

i will have to get ahold of the dealer were the p.o. bought the bike to see what type of pipes they are and what exactly they did to the bike.

Take a pic, we can probably figure it out. Regardless of what brand of pipe it is most likely going to cause a lean condition, thus your popping and backfire at decel.

redeye · 05-14-2008, 05:54 PM

thanks frostbitevinnie go to my other post to see the pics of my bike.

frostbitevinnie · 05-14-2008, 08:39 PM

Looks like three possible pipes.

1) Cobra Lo-Boy Shotguns
2) HK 2.75 Big Straights
or
3) Cobra Speedster Longs

I could be wrong but those are the choices I see.

Kodatech · 05-14-2008, 08:50 PM

+1 But to me they look like speedster longs.....JUST because of the end caps. I dont remember HK having caps shaped that way...but im not sure.

05-13-2008, 07:46 PM	#1 (permalink)
pdawkins Newbie Joined: May 2008 Bike: 06 Suzuki boulevard C90SE Posts: 1	C90 Se Just installed new cobra short pipes and am having trouble with the bike backfiring on deceleration. Anyone know how I can fix this problem. Thanks Paul Last edited by pdawkins; 05-13-2008 at 07:50 PM. Reason: Spelling

05-14-2008, 08:39 PM	#9 (permalink)
frostbitevinnie No Significant Other Joined: Jul 2007 Bike: 07' C90T 76' MT250 Location: 3rd house NW of the Depot Posts: 2,271	Looks like three possible pipes. 1) Cobra Lo-Boy Shotguns 2) HK 2.75 Big Straights or 3) Cobra Speedster Longs I could be wrong but those are the choices I see. __________________ Go sit on a egg!!

05-13-2008, 09:13 PM	#2 (permalink)
Kodatech Handlebar Consultant Joined: Sep 2005 Posts: 614	Disable or remove you pair valve. If that doesnt work you are going to need a powercommander or similar device. Check the torque on the head bolts. 17in/lbs is the spec. Did you use new gaskets? Do you have a powercommander?....If so I have a map that WILL FIX the popping/backfiring as long as all of your other things are in order....meaning NO exhaust leaks. I am running cobra speedster slashdown pipes on mine. If you get a powercommander let me know and I will email you the MAP I am running. None of the standard maps are 100% perfect. It took me a few hundered miles, and the help of another C90 rider, but I got my bike running PERFECTLY with NO backfiring.

05-13-2008, 10:29 PM	#3 (permalink)
redeye Newbie Joined: May 2008 Bike: boulevard c90 Location: wisconsin Posts: 22	hi not to highjack this thread but. I just got my c90 and it also has the cobra pipes and supposedly the powercommander and it still backfires. any help would also be great. i do not know if the pair valve is removed or not.

05-13-2008, 11:06 PM	#4 (permalink)
Kodatech Handlebar Consultant Joined: Sep 2005 Posts: 614	wich cobra pipes do you have?...I have speedster slashdowns and a K&N filter...I am running a custom map and it does NOT pop at all.. email me if youwould like to try the map for your own bike Yomamma75@hotmail.com

05-14-2008, 05:15 PM	#6 (permalink)
redeye Newbie Joined: May 2008 Bike: boulevard c90 Location: wisconsin Posts: 22	i will have to get ahold of the dealer were the p.o. bought the bike to see what type of pipes they are and what exactly they did to the bike.

05-14-2008, 05:54 PM	#8 (permalink)
redeye Newbie Joined: May 2008 Bike: boulevard c90 Location: wisconsin Posts: 22	thanks frostbitevinnie go to my other post to see the pics of my bike.

05-14-2008, 08:50 PM	#10 (permalink)
Kodatech Handlebar Consultant Joined: Sep 2005 Posts: 614	+1 But to me they look like speedster longs.....JUST because of the end caps. I dont remember HK having caps shaped that way...but im not sure.

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