Do you have to rejet the carbs with an aftermarket exhaust or is it something recomended. Can you still ride the bike for a little while without rejetting and not mess anything up?
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It depends, are you going a full exhaust with headers and all, or just a slip on?
Full system, yes, you need to rejet.
Slip-on, no, you do not.
With a full system, you will be getting a lot more flow through, meaning you will need to readjust everything.
Slip-on does not cause much of a difference in flow. Is there a difference in flow? Yes, But not much. I got into a argument with a dealership about 2 months ago about it. They ordered a jet kit for my bike, without telling me, and were going to put it in, and charge me for it. I told them I don't need one, they stated I did since I had the slip on. Needless to say, I told them to stop all work on my bike, and prep it for me to take home.
The difference is small, so no jet kit needed. You could still do one, and it would make a slight difference, but not much.
Happy Modding!Kan-O-Gixxer!
-89 Gixxer 1100 Engine
-Stage 3 Jet Kit / KNN Pod Filters
-Ohlins Susupension
-Various Other Mods
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Not all slip ons are the same. Some are full race type canisters.
If the bike is now substantially louder than it was with the stock system, chances are very likely it could use richer jetting. fwiw...your engine would prefer not to run on the government mandated lean stock setup and it will reward you with gained horsepower if its properly jetted to account for the better flowing exhaust and intake changes.
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