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16th March 2012
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Biker
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Join Date: Aug 2011
Posts: 14 Sportster/Buell Model: hugger Sportster/Buell Year: 1998
Reputation: 10
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Need Help! Carb/Jet ?
I have a 1998 883 hugger. The person i bought the bike from installed a 1200 kit on the bike, and also has drag pipes with no baffles. I put a velocity stack intake on the bike this weekend. I rode the bike which seemed fine when your giving it throttle but when you are at a constant speed it almost feels like the engine is cutting in and out. ( and after reading through this forum and talking to the hd dealer i bought a slow 45 jet and a 180 main jet) which i installed the next day because i figured i was not getting the fuel i needed....when i took the carb off i found the owner before me had a 48 slow jet and a 160 main jet installed...I put the 45 and 180 jet in and rode it again and the same thing is happening except i believe it feels a little better but def not ridable for long ....my question is what jet size should i have with this setup so my bike is back to normal...also one small note, when i put the jets in i also installed the kit from dkcustoms that relocates the coil...do you think moving the wires around could be causing this issue i am having. i dont believe the spark plug wires have been ever changed and the bike has 15,000 miles on it. Thank you.
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16th March 2012
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Jester Mafia
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Join Date: Jan 2008
Location: So Cal
Posts: 8,531 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2006 Sportster/Buell Model #2: XL1200C Sportster/Buell Year #2: 2006 Other Motorcycle Model: 48 Other Motorcycle Year: 2012
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Welcome Aboard Brett !
Lets check the idle mix screw first OK ?
__________________
Thy Sportster Come
It Shall Be Done
On Earth as it is on Salt
2006 Sportster XL1200C
Mikuni HSR 45
Jetted 30 slow,175 Main
97 Needle,Clip posistion 3
Hurricane Flow 3" offset AC,Rocketman Mod
Daytona Twin Tec TC88A,Rico Nomad Map
Sumax Thundervolt plug wires,NGK DCPR8EIX spark plugs. Gapped .040 and Indexed
Patriot Defender Pipe
Royal Purple 20W50 MC oil
Wix 57148 oil filter
Max Power, 77.73
Max Torque, 75.98
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16th March 2012
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Biker
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Join Date: Aug 2011
Posts: 14 Sportster/Buell Model: hugger Sportster/Buell Year: 1998
Reputation: 10
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Quote:
Originally Posted by rocketmangb
Welcome Aboard Brett !
Lets check the idle mix screw first OK ?
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thank you!
it is at 4 turns out right now. i had it at 2 out first and it was backfiring through the carb. |
16th March 2012
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Jester Mafia
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Join Date: Jan 2008
Location: So Cal
Posts: 8,531 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2006 Sportster/Buell Model #2: XL1200C Sportster/Buell Year #2: 2006 Other Motorcycle Model: 48 Other Motorcycle Year: 2012
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4 turns is waaaay out !
Lets check for an intake leak next !
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16th March 2012
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Biker
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Join Date: Aug 2011
Posts: 14 Sportster/Buell Model: hugger Sportster/Buell Year: 1998
Reputation: 10
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Quote:
Originally Posted by rocketmangb
4 turns is waaaay out !
Lets check for an intake leak next !
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i will check for air leaks tonight. do you think the jet size could be causing the problem? The bike idle and revs up fine. |
17th March 2012
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Senior Master Custom Bike Builder
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Join Date: Apr 2006
Location: The Warm Southeast! U.S.A.
Posts: 5,586 Sportster/Buell Model: XL 1200 R SOLD! Sportster/Buell Year: 2006
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Here's something that Maru posted recently which may give you some ideas. http://xlforum.net/vbportal/forums/s...9&postcount=22 |
17th March 2012
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Biker
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Join Date: Aug 2011
Posts: 14 Sportster/Buell Model: hugger Sportster/Buell Year: 1998
Reputation: 10
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Quote:
Originally Posted by Don Burton
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very good watch, but the problem happened after i installed the velocity stack. i rode for probably 3,000 miles with the drag pipes with no problem. The problem happens at constant rpm and almost feels like the bike jumps back and forth. you can def tell that the bike is cutting in and out. |
17th March 2012
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Jester Mafia
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Join Date: Jan 2008
Location: So Cal
Posts: 8,531 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2006 Sportster/Buell Model #2: XL1200C Sportster/Buell Year #2: 2006 Other Motorcycle Model: 48 Other Motorcycle Year: 2012
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Check the bowl vent on the carb !
Make sure no part of the stack is obstructing the vent
The vent is on the face of the carb at 10 o clock between 2 bolt holes
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17th March 2012
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XL FORUM TEAM MEMBER
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Join Date: Oct 2008
Posts: 3,192 Sportster/Buell Model: Buell S1 Sportster/Buell Year: 1997 Sportster/Buell Model #2: Buell S2T Sportster/Buell Year #2: 1996 Other Motorcycle Model: Moto Guzzi California Other Motorcycle Year: 2003
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Can you post a photo of the velocity stack so i can see it?
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18th March 2012
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Biker
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Join Date: Aug 2011
Posts: 14 Sportster/Buell Model: hugger Sportster/Buell Year: 1998
Reputation: 10
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Quote:
Originally Posted by maru
Can you post a photo of the velocity stack so i can see it?
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