jet kit necessary with pipe?

[gilroy222]

ok so i've been talking to this guy and he says that if i just buy an fmf pipe i wont notice a whole lot more power,he recomends a jet kit and a uni-filter since there is more air coming out of my bike with the pipe then the jet kit will allow the right fuel into the motor. so wut i want to know is is this true or would just plain old adjusting my stock jets with the new pipe work just as well as a kit? also i had another thread but i dunno where it went and i said that one of my dads friends has been around engines for 30 some years and has never seen a 4 stroke need its jets adjusted with a new pipe?? anyone give me some answers on both questions

1.) is a jet kit and a air filter a must if i want the most out of my pipe?
2.) is it ture that my bike may not need its jets adjusted with the new pipe?

[tigmaster]

Yes, a filter and pipe combo will dealt you much better results. And with that large of a change in air flow, jetting will have to be changed. A jet kit makes it easy but is by no means a must. You can buy individual jets too. Just realize that with a jet kit you can no longer just go buy jets because they will not fit anymore. It is however not true that you will not need to jet if you get a pipe. Many people will have you believe you don't need to jet for a pipe, hell, many people believe switching from a stock to aftermarket air filter doesn't require a jetting adjustment. Anything you do to the engine like that requires jetting to get every ounce of power. Otherwise you just wasted $300 of your money.

[gilroy222]

alright well i think im going with the FMf powercore 4 slip-on,and the dyno jet kit but i will probably get my dealership to install it all because i could probably install the kit i just wouldn't be able to adjust it and they probly have a dyno to run it on too so mise well get them to put on the pipe too and about the air filter i herd that k&n's r rlly good but they aren't good for offroad because if they get dust in them ur f'd so someone said to get a unifilter? is that a good filter or would u recomend something else?

[tigmaster]

Ummm.... your dealership isn't going to be putting your bike on any dyno. They are going to use the same techniques I have outlined in my how-to on jetting. They may just slap a jet in there in call it good even.

As far as filters, I would suggest Twin Air. I have had no trouble with them and I just got back from the SAND DUNES and did not find anything questionable.

[gilroy222]

alright thanks so wut do u think i should do about the jetting, should i call the dealership and ask them if they could or should i take it to a mechanic cuz im pretty positive i dont know how to do it

[turtlemann14]

if you know what jets to get all you have to do is take four bolts out (on the bowl) unscrew the jet put the new one in the the bowl back on and adjust it

[tjscott2012]

but, if you are like me and still dont trust yourself, take it anywhere but a dealer, they always will rip you off.

[gilroy222]

yeh my dad was talking to one of his friends whose son races and he said he goes to a guy who knows alot about dirt bike engines and used to race himself so we're gunna talk to him

[tigmaster]

http://www.mototips.com/how-s-perfor...your-ride.html

[gilroy222]

oh okay i think i get it now, but the only thing i dont understand is how u tell like wut number its at? like does it say the number on the bolt and then an arow on the carb pointing to the number or wut? do u understand wut im saying?