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General Category >> Rubber Side Down! >> Getting ready to re jet
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Message started by solancodad on 10/16/10 at 09:14:17

Title: Getting ready to re jet
Post by solancodad on 10/16/10 at 09:14:17

Hi everyone. New guy here. Getting ready to hang a Sportster muffler, cone air filter and re jet my 09 S40. I've already removed the pilot screw plug, I'm going to start with removing 1/2 of the needle spacer. I picked up a 152.5 and a 155 main jet. With the above mods, would a 155 be a better place to start. I don't care much about mileage, I'm a big guy and I'm looking for better mid to top end and stopping the backfiring!

Title: Re: Getting ready to re jet
Post by justin_o_guy2 on 10/17/10 at 05:16:55

a 150 mite be just fine.

Title: Re: Getting ready to re jet
Post by solancodad on 10/17/10 at 08:46:26

A 150, even with a cone filter ?

Title: Re: Getting ready to re jet
Post by justin_o_guy2 on 10/17/10 at 09:09:08

Ya know, Im gonna wait & see what Lancer or someone else says on that. I wouldnt be afraid to try it, but, Id`rather have the blessings of one of the real tuning guys.

Title: Re: Getting ready to re jet
Post by solancodad on 10/17/10 at 10:26:40

Thanks Justin .

Title: Re: Getting ready to re jet
Post by Routy on 10/19/10 at 07:14:44

Are you just shooting in the dark, or do you have evidence you need to rejet ? Not taking away from the tuning experts here, but even they would have a hard time telling what your bike actually needs for jetting. It depends on your bike first of all, then altitude, and several other things determine what you need.
I did a spacer mod only, because thats all it needed, (to correct low speed surge) and.....just for info, that did not change the backfiring one bit.
Changing to a less restrictive filter is no reason to rejet,......unless you do a lot of WOT, because that is the only throttle range where it will make any difference....if there. Even a modified exhaust will only make a difference at higher speeds,....and is not a reason in itself to rejet.
I know, others have different opinions about this kinda stuff.

Title: Re: Getting ready to re jet
Post by verslagen1 on 10/19/10 at 10:37:53

It's quite easy actually, just a few simple rules to follow.
Look at your plug, WOT test on a hill, starting, shutdown, accel, steady running at various speeds, and mpg.

You get the 1st 3 right, the rest will be icing.

Title: Re: Getting ready to re jet
Post by solancodad on 10/19/10 at 16:48:16

Thanks guys!