250-500cc Factory jet kit revisited

Just got the factory jet kit for my wr300, what is the consciences on which jets to use? The note attached recommended the 45 pj 430 main with the needle in the middle clip. Seems like that is kind of rich for the pilot and lean for the main compared to stock.

Hello Mantrap! First of all: What temp and elevation are you at? When i had my Mikuni i had the GAY needle in 2nd clip from the top and a 470 mainjet in the winter when we where iceracing. I used the 45 pilotjet at -10 degrees celsius, but even then it was a bit rich for me. I was never really satisfyed with this so i started to laborate with different needles and jets, and my best setup was to use a needle named 6DEY15-74 combined with a 40 pilotjet and a 450-460 mainjet. I used this needle in 2nd clip from the top. But the best solution is to get a Keihin PWK 38 AS. This carb makes a BIG difference and is easier to get right with the jetting. Motosportz here at the forum has them for a good price.

Johnny

I'm at 1000' and the temps are from 60 to 80 deg.

Ok. i would try the needle in second clip from the top, 40 pilot and a 450 main. i never really liked the GAY needle, but the DEY was ok for me. get back when you have tried a new setup!

Johnny:sweden: