Could someone explain to me why some mufflers you can buy say you have to rejet your carb when installed,and some don't.
I just bought a AEEN muffler and they say I don't need to rejet???But when I was looking around at mufflers there was
quite a few where you have to.

Does anybody use this AEEN muffler and if so how do you like it.

Frank

 

Anytime you swap components you'll need to rejet to get the maximum potential that product has to offer. If the temp changes a few degrees you'll need to rejet (to get the most out of your machine). Using company X's muffler may make the bike run on the rich side, which only really hurts performance/fuel economy/etc., so they might not be inclined to advise you to rejet. If company Y's muffler causes your bike to run lean, they will tell you to rejet so they can't be blamed if something happens.

 

I have alot of products from Aaen performance including a pipe. If they tell you that you don't have to re-jet, believe them. With a four stroke you usually don't have to re-jet with a simple exhaust change. Aaen will not lie to you or anybody, they are very friendly and helpful and know alot about Polaris products and mods, but If you are still unsure, I would call again and ask to speak to a tech. and ask them to make sure. No I don't work for Aaen, I just think they are one of the better aftermarket companies out there especially for Polaris.

 

After reading my post I can see how some would take it the wrong way. Sorry, I didn't mean to imply that any company would lie to you about rejetting w/thier products, or that they aren't knowledgeable about thier product or that they would misinform a customer. I was just trying to say that when you change one aspect of your engine rejetting might be required to obtain maximum performance. Regardless, please do call them and post back when you get an answer.

 

I will agree to that as any machine from the factory should probably be re-jetted for your altitude and weather. On the other hand a re-jet is normally not necessary with only a pipe change on a 4stroke motor. A 2 stroke is a whole different story.

 

You certainly dont have to be as much concerned with messing up the engine on the thumpers when changing the pipe. When you do the full exhaust change with pipe and silencer, jetting should be checked and done if necessary like Faded said to make the most power you can. And definitely the 2-cycles are a different animal completely.

 

I want to change the statement I wrote above or rather add to It. It has been my experience with the Scrambler 500 that jetting changes are not always necessary with a pipe. For instance the Supertrapp pipe. I was specifically talking about the Scrambler 500 and not all 4 stroke motors. I was just telling it from my experience with the Supertrapp and didn't mean it to sound like It did. I regret not being more specific and hope I didn't step on any toes!!

 

1, 2, 3...10, Yep, I still have all my toes![img]i/expressions/face-icon-small-smile.gif[/img] Alas, I do originate from the land of two-smokes so I am somewhat use to constant jetting changes. I simply meant to state that checking the jetting never hurts. For me it's a confirmation that I'm not missing out on all the power potential my bike has (the CR, not the Bayou). I have had experience jetting a Scrambler 400 after changing the pipe, but Bubba297 said, 2 strokes are a completely different animal. My apologies.