I was just wondering what would happen if you didnt rejet your carburetor after installing an aftermarket exhaust, air box mods, etc. Anything serious?

 

depends on if its a 2 stroke or not. you could have a melt down if not jetted right, and you wont get the full benefit of the exhaust perforcemance w/out jetting for free flowing air.

 

One you won't see the power gains. Two it will probably run hot from being too lean. Look, if you mod you have to jet. Jetting is very simple, but will probably take a couple of trys to get it right. When right you will love the extra power.

 

You can still burn up a 4 stroke if the jetting is off. It gets expensive in a hurry to. If you don't feel confident doing it yourself, spend the money and have it done by a professional. Money well spent IMHO.

 

Yes i was most likely gonna jet after i put my pipe on. I was jus wondering if i really had to spend the money, but now i see it is worth it
Thanks

 

just remeber when you jet change there are temperture ranges to go by to get the most out of your pipe. if you change jetting to like 60 degrees it wont work for 20 degrees. it all depends on temp and also attitude as well. it takes alot more 2 burn a 4 stroke then a 2 stroke but yes you can seize it as well.

 

Sorry I cant offer the links as I lost them when the old hard drive crapped out, but do a search (both here on google etc) on jetting and you will find plenty of info to help you out.

One thing to remember is that depending on your elevation and even temps etc you may not actually need to rejet. Also since many manufacturers purposely pre set jetting on the rich side (mostly to help in break in, and for safety of the engine) just adding a pipe may create an optimum jetting anyhow, but the problem is knowing if it is.

Honestly I have seen many more times that engines are jetted rich than lean, and this can affect performance as much as being lean (though you wont have a melt down, but the added carbon build up can do damage in the long run too). The trick is to either learn and understand jetting, or figure how to find someone to pay who actually knows it (not all techs do sadly).

Its not all the techs fault either, or even the rider/mech because even many pipe mfg supply info and even sometimes the jets themselves that very much err on the rich ride. If you think about it does make sense that the people responsible for your mod supply the info or product that would allow them the best insurance against your toasting your engine, and that of course is jetting rich.

Once you learn or find the right person who does know jetting you will find that though sometimes a real pain to do having the correct jetting that isnt too lean or rich will produce the best performance, and that goes ten fold for a two stroke.