rejet needed?

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Dec 11, 2011 | 04:48 PM

#11

dc1450

Road Master

Joined: May 2005

Posts: 1,121

Likes: 3

From: Mass.

Quote:

Originally Posted by Spanners39

Have to disagree on this point...before I added an EV27 I went from a 165 to a 185 just to keep up with the K&N filter. I used to run a bike shop and we always sold jets with a K&N filter....we even had a calculator to work out the correct jet sizes....you can hole a piston on a Harley with the wrong jets.

One point though...in the USA you have way different gas so we tend to jet bigger in NZ...a 50 slow and a 200 main is not uncommon....

You are correct about a lean condition holing a piston but, there has to be some difference with your gas down under. I have run this combo on quite a few Evos and never had a lean condition........in the USA. The Yost tube supposedly atomizes the fuel better. It also comes with a drill to open up the hole in the slide so it opens quicker. It has a needle that matches the emulsion tube, this also works to richen the mixture sooner in the throttle throw. The only time the main jet size is a factor for a lean condition is at WOT which happens how often on the street?
Maybe, if I was actually racing on a track, I may need a slightly larger main jet, but on the street, the stock jet is fine.