Question about 2005 Harley Davidson FLSTSC - FLSTSCI Softail Springer Classic

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New pips Do I need to rejet the carbs on my Harley low rider if I install new SLIP ON pipes?? If so should I pay to have it done with a dyno or do it myself? Thanks to those motorcycle enthusiasts with answers for me!

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No.Although, it is a common practice to de-tune bikes at the factory so that they meet emissions requirements. All new injected HD's can expect a 4-6% increase in horsepower and 2-3% increase in torque just by dyno tuning the bike straight off the showroom floor. If you're riding a Low with a carb, then you do not need to have it re-jetted for slip-on's. If you're changing the exhaust from where it bolts to the engine, then yes you should. Dyno tuning is not as useful on carbureted bikes compared to injected ones, in fact I could tune a carbureted Low just as easily with an Exhaust Gas Analyzer as a dyno and save you $300. You're probably not that interested in minor differences in horsepower if you're doing slip-ons rather than a whole Screaming Eagle Stage 2 kit. Bolt 'em on and ride...

Posted on Nov 20, 2008

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1 Answer

Xl883r can I take the baffles out of my vince hine slip on without damaging the engine. and will I need a heavy breather air filter.


Removing the baffles will lean out the mixture, so either rejetting the carb, or reprogramming the ECM or a "piggy-back" unit installed will be needed.

Actually, open "straight" pipes are the worse for performance, as some back pressure is needed.

Also, to help performance with a "free flowing" exhaust, a more "free flowing" air cleaner would be needed.

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Really need more information, i.e., does it run bad on the primary circuit, on the main jet or both and does it accelerate good? At a high level it is going to be very lean with straight pipes and a K&N on it. I would tell you more but I am so tired of having my hearing abused by straight pipes I will pass. Put some mufflers on that rice burning irrigation pump engine between your legs.

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1. vacuum leaks at the back side of the carb spigots or other vacuum lines off/broken. Remove the carbs and spigots from the head and clean with acetone/laquer thinner afterward sealing the spigots to the head with gasket maker/silicone rtv.
2. Carb idle and low speed jets may be plugged up and carbs need a correct cleaning.
3. Carbs need rejetting to match the after market mufflers. Take it to a shop with a motorcycle chassis dyno and they will be able to tune the after market pipes.

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2001 Honda VT 1100 C2 Shadow Sabre Running Lean


I have a 2007 Honda Shadow Sabre VT1100 and I also put after market pipes on it from Vance and Hines. I also have to keep it choked when first starting and sometimes even hold the throttle a bit while it warms up. The bike has two carburetors and the best solution I have found by lots of asking around of mechanics and bike folk is to get it rejetted through Dyno Jet. It is meant for bikes with after market exhausts and much less back pressure from the lack of those stiffling baffles in the stock pipes. I have also noticed the power loss in the middle torque range and backfiring because of the bike running in a lean condition. The Dyno Jet website is a good place to find the correct set and corresponding part number, but then I suggest finding a cheap place online so you avoid retail price :) Hope this helps. Oh, and don't forget to buy two kits...we have two carburators in our bikes.

Mar 09, 2012 | 2001 Honda VT 1100 C2 Shadow Sabre

1 Answer

2009 Harley Davidson 883 Sportster. Can I put new slip on pipes on without changeing any thing else


That's hard to say. A motorcycle engine is finely tuned system. If you change one thing, that changes something else. It is possible that you may not have to change anything. Then again, you may have to rejet the carburetor. As they come from the factory, the carburetor is jetted very lean in order to meet EPA emissions standards. The free-flowing mufflers will probably make it run even leaner. Rejetting the carburetor is not very expensive but the labor to have it done could be. Just go to the next size slow speed jet and adjust the idle mixture screw. Those "DynoJet Kits" are a rip off.

Good Luck
Steve

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2 Answers

I had V & H pipes on my 2000 FXDL low rider last year. The chrome tip was chipping. V & H sent me a new tip. Is it OK to remove the baffle and run the bike without it?


It will kill the low end tq..you can do it itll be louder .. the air cleaner will allow the same air in ..if you would put on a freeer flowing a/c then jetting changes would be needed...

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1 Answer

Carb re-jet


I would rejet the carbs. I would go one size up on the jets. That should clear up the problem.

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1 Answer

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No it will not. You probably don't NEED to rejet at all. If the manufacturer suggests it for your bike and pipe combination I would follow their advice. If they do not suggest it I would use a dyno to get the best performance from your new setup. Keep in mine your new exhaust only lowers the back pressure. You haven't changed the intake parameters at all as far as airflow. So any additional air going into the cylinders due to your new exhaust will only be because of the reduced volume in the cylinder while the intake valve is open. This is a rather small amount, so don't get all crazy and jump several jet sizes at once.

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1 Answer

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All anyone is doing at this point is guessing on the jet size. With all the work you've had done I would go ahead and pay for a dyno tune up.

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