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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 13th September 2012
OldSchoolBully OldSchoolBully is offline
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Default Drag pipes, effects?

I have done a search and didn't quite come across what I was looking for. Let me put this in context by saying I have zero experience with the HDs and am speaking as someone who has has only messed with Japanese bikes. When I bought my ride the PO threw in a set of slash cut drag pipes. When running these regularly, does the sportster require any sort of rejet or adjustment? The oversensitive Kawasaki carbs needed rejetted for air pods so I was wondering if it was an issue on the Harley. Thank you in advance....
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Old 13th September 2012
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Drag pipes only work with apehangers.
Kidding, I feel funny this morning.
Well it all depends on if the bike was properly jetted before you changed the pipes. If there was a major change in the amount of restriction in the exhaust then I would say yes you may need a rejet but if only a minor change in exhaust then probably get away with tuning the air jet screw. It all depends on what the previous owner did to it. Adjusting the air screw will tell you if you need a larger or smaller pilot jet.

Check out the Stickies for carb tuning. Many Jap bikes use the same but slightly different Kehein carbsonly the Jap bikes have a decent air tuning screw and nylon sleeves on the slide.

Last edited by BobWLR; 13th September 2012 at 16:24.. Reason: Stikies.
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Old 13th September 2012
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S&S has a great video on utube about the effects of drag pipes.
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Old 13th September 2012
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Quote:
Originally Posted by decman View Post
S&S has a great video on utube about the effects of drag pipes.
Good find, the video was well done... thanks.
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Old 13th September 2012
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Excellent video. So, no good way to run drag pipes without that loss. They would have been an occasional addition anyway, I don't hate my neighbours enough to ditch the stock pipes entirely. Thanks for all the info.
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Old 13th September 2012
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You can modify the stock pipes to get pretty good performance and not too loud. If it's a 2001, drill a 3/4" hole in the baffle plate that you see when you look into the end of the muffler.
Some knock it out entirely but I prefer the 3/4" hole. It mimics the SE Torque mufflers that hey used to sell back then.

Quote:
Originally Posted by OldSchoolBully View Post
Excellent video. So, no good way to run drag pipes without that loss. They would have been an occasional addition anyway, I don't hate my neighbours enough to ditch the stock pipes entirely. Thanks for all the info.
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Old 13th September 2012
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Default What a drag

Just picked up some drag pipes, now I've watched the video. I used to run straight through TT type pipes on my Triumph Bonnie, I had to go up from 205 to 220 mains to get it to run right but definate performance increase. (and noise) I'll let you know how I get on, if it dosen't run good they can go on ebay.
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Old 13th September 2012
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Welcome to the XLForum.

Drag pipes kill your mid range power. A good 2 into 1 system, free flowing air cleaner and a proper tune will give you the most power.

My 72:



My 07:

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Old 13th September 2012
OldSchoolBully OldSchoolBully is offline
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Your 72 is akin to what I'll one day own. Gotta get a feel for the Harley before diving into the ride everyone warned me off.

As I said, my plan was sporadic use of the drag pipes, once in a while to annoy the local Harley haters, of which their are many. Purely cosmetic, purely for noise. I've seen a few two into ones, it's what I run on my KZ. Best start looking. I have a new K&N air filter to go on, looking for a new less chromey air cleaner (coming from a scruffy/rat background I am adverse to chrome overdose). I'm not doing anything major until I ride the hell out of it.
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Old 19th September 2012
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Default drag pipes

Well after a bit of fiddling got the bike to run pretty well, maybe lose out a bit in the mid range but not much and the sound on the overun is beautiful. I do live in the middle of nowhere not too many people to upset, I even had one old boy walking his dog tell me to wind it open.
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