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30th July 2010
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Biker
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Join Date: May 2009
Location: san jose
Posts: 95 Sportster/Buell Model: xl1200r Sportster/Buell Year: 2006
Reputation: 37
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exhaust noise
So I got a new set of custom pipes that I fabed up on my stock 1200. The dealership did a stage one upgrade on it when I bought it. The pipes are an inch and three quarter 2-2 system that are 38 inches long with big city thunder monster baffles installed. The bike runs great except for a fumbling bumbling sound that is most apparent in second gear at 3800 rpm and disappear at 4k. I can’t tell if this is a characteristic of the pipes or a jetting problem. Thanks for the help.
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30th July 2010
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JESTER MAFIA
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Join Date: Feb 2006
Location: Indian Territory
Posts: 9,131 Sportster/Buell Model: NRHS 1250-R Sportster/Buell Year: 2005
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How about some pics? We are picture whores around here.
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A Member of The Cell
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30th July 2010
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Senior Master Custom Bike Builder
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Join Date: Sep 2006
Location: Dallas
Posts: 7,701 Sportster/Buell Model: XLH 1200 Sportster/Buell Year: 1988
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More than likely reversion. I'm a big fan of Thunder Monsters, but they're not that good stopping reversion on 2:2 pipes that don't have a balance tube.
You can tune a lot of it out with a bunch of work, but it will still have a serious power dip between 3 and 4 k. When the reversion happens you go really rich.
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Completely stock except for, Branch #5 heads & 10.5:1 JE pistons, Red Shift V531 cams, S&S Super E, ThunderJet, V&H Sideshots, S&S Flywheels, Dyna 2000i, Stortz 55mm Inverted Fork, JMC Swingarm, Works Performance 12.5" Shocks, PM 4 Piston, PM wheels, 18 x 150 R tire, Custom Belt Drive Conversion, Still Has Original Nut Behind The Bars
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30th July 2010
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Biker
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Join Date: May 2009
Location: san jose
Posts: 95 Sportster/Buell Model: xl1200r Sportster/Buell Year: 2006
Reputation: 37
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gonna have to post that tomorrow. no access to a camera right now
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30th July 2010
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JESTER MAFIA
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Join Date: Feb 2006
Location: Indian Territory
Posts: 9,131 Sportster/Buell Model: NRHS 1250-R Sportster/Buell Year: 2005
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I agree with Biknut, if you are only getting this symptom in a 200 rpm range, it is most likely reversion.
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30th July 2010
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Biker
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Join Date: May 2009
Location: san jose
Posts: 95 Sportster/Buell Model: xl1200r Sportster/Buell Year: 2006
Reputation: 37
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thanks for the input guys. can reversion cause any damage?
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30th July 2010
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Senior Master Custom Bike Builder
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Join Date: Sep 2006
Location: Dallas
Posts: 7,701 Sportster/Buell Model: XLH 1200 Sportster/Buell Year: 1988
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Quote:
Originally Posted by mickeyvex
thanks for the input guys. can reversion cause any damage?
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I'm not going to say it can't cause damage, but I wouldn't be too concerned about it. |
30th July 2010
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Biker
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Join Date: May 2009
Location: san jose
Posts: 95 Sportster/Buell Model: xl1200r Sportster/Buell Year: 2006
Reputation: 37
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Quote:
Originally Posted by biknut
I'm not going to say it can't cause damage, but I wouldn't be too concerned about it.
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perfect. thats all i need to know.  thanks |
31st July 2010
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Whitworth Products
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Join Date: Jun 2010
Posts: 6,473 Sportster/Buell Model: 1200R Sportster/Buell Year: 2005 Other Motorcycle Model: 5 bikes and 1 quad
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I agree, rich is usually very safe, it just costs HP.
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31st July 2010
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XL FORUM TEAM MEMBER
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Join Date: Dec 2006
Location: Sunny Italy
Posts: 15,387 Sportster/Buell Model: XLH 1200 Sportster/Buell Year: 1993 Other Motorcycle Model: Moto Guzzi California EV Other Motorcycle Year: 1998
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Yeah, it's almost certainly a reversion problem. Highly unlikely to be a jetting problem.
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Jim in Italy
'93 1200
4"Extended Jaybrake Forward Controls
58mm Inverted Wide Glide Front End
Super E Carb w/Forcewinder Air Cleaner
WetDreamz Pipes
Holographic Metal Flake Paint Job
Six Piston Jaybrake Calipers
16" Carlini Apes
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