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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 22nd July 2009
miahallen miahallen is offline
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Default intake/jets/exhaust upgrade - effect on gas milage?

I've got a bone stock '06 883C with a Kuryakyn Pro-R Hypercharger and hi-flow K&N on the way

I'd like to jet the carb, and add a SuperTrapp 2-1 exhaust system to improve performance a bit.

My question is, what is the tradeoff? Will my milage suffer? How much? Any other downsides that the upgrades will create?

Thanks!
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  #2  
Old 22nd July 2009
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IMO:
You should suffer very little in MPG, Because if the engine is properly tuned it will become more effiecent.
The reality though is you may loose a small amount of MPG's Simply because with it running this much better you will likely Not drive easy...!
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  #3  
Old 22nd July 2009
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What Matt said.
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Old 22nd July 2009
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Not disagreeing with the other guys but it depends where your tuning is coming from and where you are going to. If you start with a stock bike running lean with an AFR of around 14.5-15.5 and add cams, ignition, A/C, pipes, etc and tune the carb then you will definately see the difference in MPG. You can go from 150 miles to reserve on a 4.5G tank to about 110 miles.
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Old 22nd July 2009
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You are correct. It all depends of the tune of the AFR.
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Old 22nd July 2009
miahallen miahallen is offline
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AFR = air/fuel ratio right??? (sorry, I'm a total rookie)

Do I need to find a Harley mechanic to adjust that? I live in northern Japan, and I don't know of an authorized factory mechanic anywhere north of Tokyo.
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Old 22nd July 2009
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Quote:
AFR = air/fuel ratio right?
Yep.

Quote:
Do I need to find a Harley mechanic to adjust that?
There are a lot of options for DIY tuning. There are also a few self tuning devices (black boxes) available.
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