350X with a pipe and needs Jetting...

[Thorpe]

So I just threw a Cobra head pipe and aluminum silencer on my X, and boy, my neighbors are gonna be pissed. Man that thing is loud! I have only run it for a few moments, due to the fact that I know I need to do some jetting, but, I have no idea where to begin... The carb is still on the stock jet at 138, Anybody have a recommendation on how much farther to go up? :beer

[bigreddaddy]

So I just threw a Cobra head pipe and aluminum silencer on my X, and boy, my neighbors are gonna be pissed. Man that thing is loud!


LMAO




I have only run it for a few moments, due to the fact that I know I need to do some jetting, but, I have no idea where to begin... The carb is still on the stock jet at 138, Anybody have a recommendation on how much farther to go up? :beer


Why not just run it and see how it performs, and then check the plug. Maybe you can just tune the carb to adjust for the pipe. Just a thought.

[The Goat]

don't do that...

if you tune that bike to run merely by using the airfuel screw, you'll likely toast that engine.

first thing you should do is sell that cobra pipe and put a stock 450r on it. if you're stubborn..

then you'll likely just need a slightly larger mainjet...and might need to raise that needle clip a notch.

[Thorpe]

You have a 450R pipe you want to swap out for a cobra?

[chris200x]

I ran a cobra and now a supertrapp and didn't have to rejet my X either time. run it and keep an eye on the plug.

[SWIGIN]

don't do that...

if you tune that bike to run merely by using the airfuel screw, you'll likely toast that engine.

first thing you should do is sell that cobra pipe and put a stock 450r on it. if you're stubborn..

then you'll likely just need a slightly larger mainjet...and might need to raise that needle clip a notch.



450r's have a single head pipe 400ex is the one your thinking of.....unless you mean the silencer

[Dirtcrasher]

ANY and all loud and or free flowing exhaust will require jetting changes.

My SX with a Cobra went up numerous sizes on the main and the 450R with the HRC tip on the 3fiddy also needed a sizable change in jetting.

[Erics350x]

You could prolly just raise the needle a couple notches. Without allowing more air in theres not much need to increase the fuel.

[The Goat]

ha...yeah swigin, i was talking just about the muffler, not the headpipe.

they can be had on ebay for 1 dollar plus shipping.