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First off my apologies for a long thread. I've had my '14 TRX450ER for about two years now and I'm bored with the quietness of the stock exhaust. As of now I haven't decided on which brand of slip-on I want and I'm unsure about jetting the carb. I have read on another forum that if only the exhaust pipe is changed nothing has to be done to the carb and I have also read that only the pilot jet has to be changed. So I thought I would try to get some answers here because I haven't ever worked on a FCR carb.. So honestly I'm just wanting it to sound better and not looking for any real performance gains. Everything on my 450r is bone stock and I don't plan to so any mods to the motor or air box,and I would like to utilize the stock air filter if possible because it isn't a race machine. So to say the least I would like to know the simplest way and best jets to use for the Honda TRX 450ER. Any help would greatly be appreciated!
 

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With just a slip-on pipe and no other mods you normally don't have to rejet, but you won't know till you ride it and see if it pops on decel, etc. You may end up having to go up on the main, play with needle and/or a/f screw, etc.

Rob
 

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^^what he said^^

Your usually fine with a slip on muffler/silencer. Ask the manufacturers of the brands your looking at buying before you make the purchase, they may also be able to help.
I've found (in the past) that re jetting is usually necessary when you make a significant alteration to back pressure and gas flow within the exhaust, 95% of this is within the exhaust (front tubes part) not the muffler/silencer.
 

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Discussion Starter #4
I had '04 Kawi KFX 400 and it ran great with just a slip-on muffler with minimal decel popping. Later I upgraded the air filter and it required a little bigger main jet and adjusting the pilot screw and it turned out okay. Anyway thanks a lot folks for pointing me in the right direction. By the way what would be a good choice in a slip-on pipe for someone that doesn't race and just likes a little more noise?
 

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If you aren't looking for actual performance gains and just want to be loud pretty much any aftermarket pipe will do lol. Cobra pipes come to mind. Personally I like to run an aftermarket pipe for the weight savings and looks and will run a quiet core because I don't like mine so loud. I have a MotoWorks on my 450.

Rob
 
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