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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 16th March 2012
Brettstl Brettstl is offline
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Default 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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Old 16th March 2012
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rocketmangb rocketmangb is offline
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Welcome Aboard Brett !

Lets check the idle mix screw first OK ?
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Old 16th March 2012
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Quote:
Originally Posted by rocketmangb View Post
Welcome Aboard Brett !

Lets check the idle mix screw first OK ?
thank you!


it is at 4 turns out right now. i had it at 2 out first and it was backfiring through the carb.
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Old 16th March 2012
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4 turns is waaaay out !

Lets check for an intake leak next !
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Old 16th March 2012
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Originally Posted by rocketmangb View Post
4 turns is waaaay out !

Lets check for an intake leak next !
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.
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Old 17th March 2012
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Don Burton Don Burton is offline
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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
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Old 17th March 2012
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Originally Posted by Don Burton View Post
Here's something that Maru posted recently which may give you some ideas. http://xlforum.net/vbportal/forums/s...9&postcount=22


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.
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Old 17th March 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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  #9  
Old 17th March 2012
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Can you post a photo of the velocity stack so i can see it?
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Old 18th March 2012
Brettstl Brettstl is offline
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Can you post a photo of the velocity stack so i can see it?


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