250-500cc wr 300 got a Keihin

I got sick of trying to jet the mikuni . I called up jd and he sent me a new 38mm a.s. with his jet kit . His settings were really close. The install is just a swap. This really makes this thing rip, no bog , no spoog, just clean power everywhere. I would highly recomend going this route, by the time you buy a couple jet kits and waste a bunch of ride time trying to dial in the P.O.S. mikuni you are money ahead, these bikes should really come with this carb.

So you got the carb from him as well? What kind of money we talking about? Did you try the full power jet kit too, with the mukuni carb? I'm doing some jetting on my 300 right now also, so every bit of info helps.

The carb with his jet kit was 239.00 , not bad when a jet kit is 79.99 . I bought the full power kit with the GAY needle when I got my bike and a bunch of $8.00 pilots and mains. I could never get the bike to run good all the way through the rpm range. I have a rekluse in mine and I could never get it to Idle good and run well, but it does now. Knowing what I know now, I would not have bought the other jet kit and jets , just put on the the keihin and ride.

What jets are you running in the Keihin. I have one on my 07 WR-250 and was wondering how it compares to the 300 jetting.

45 pilot, JD blue needle #2 clip, 172 main , 50:1 lucas /50super/50 110vp

I have a WR 300 with the full power jet kit. I bought my bike at the end of december and have benn iceracing mostly here in Sweden. I have no big compains about the jetting, and my bike idles good and i have no problem keeping up with my friends KTM 300 EXC. He´s bike is slightly stronger from the bottom than mine, but not on higher revs. I tried a needle named 6DEY15-74, but couldn´t notice any improvement, but i will try it again later in another clip position. We have about 10 degrees F and i run 45 pilot, GAY needle in 3rd pos. and 480 main on ice, a little rich.

Are these the settings JD recommended?

I'm about to pull the trigger on one of these and am curious what changes you made from his recommendations, if any.

Also, how come you're mixing race fuel? My motor feels very in a very mild state of tune and has never hinted at detonating on pump fuel. Have you had some motor work done?

The jetting is what came with the carb , you get two needles and a few mains. I dropped the main to a 172 from the standard 175, I am going to put a 40 pilot in place of the 45. It seems just a touch rich off idle. I run the 50/50 gas mix because it seems to run better (I do it with all my bikes) and I think the gas stays better longer.

Thanks!

I ordered one myself, but not from JD so I wont have his needles. I'll hopefully be able to get it installed and start testing by next weekend.

One last thing...
was it truly a bolt on mod? Stock carb boots, throttle cable, etc. all work?

I don't have a 300 but the price sounds very reasonable. I was going to order a JD kit for my 08 Husky CR125 but you have me re-thinking now. I may call JD and if it's not much trouble to switch and they can provide me with a Keihin option give it a try myself. Thanks for posting up.

I know about the WR250 and the pre 09 125 as I have put PWKs on both. They swap right out with the TMX. I used a 99 Honda CR250 throttle cable for both conversions as it works better. This allows the cable routing to go in front of the forks like most bikes.

Thanks for the tip NWRider. I was wondering if the two throttle cables would just swap over.

I think you can reuse the old cable (search TT for details) but I find it a lot easiser to use one that was made to work with the PWK. Plus I don't like the stock Husky routing.

My 300 cable is plenty long to route in front of the forks. Guess they changed it over the years.

You are right PC. On the 125 at least I think it is when they went to the fat bars that the cable got longer and routed normally. If I remember correctly the cable still has a problem because there is too much cable sticking out the end of the housing. I think it can be made to work by using the Mikuni cable elbow but that makes it more of a pain to screw off the top. I would just run down to Bobs Honda and get the 99 cable. Both times I needed one they had it in stock, the oem Honda one is good quality, and I think it was just around $16.

FOR REAL!?!?
They had a hard part in stock?

You should have played the lotto that night!

It is bolt on, just reuse the throttle cable and mikuni sweep on the top of the keihin. It seems a little tight getting it between the boots but it will go.

I wish I hadn't seen this but I am also glad to hear that others are having issues getting their carb jetted right. I think I'll pull the trigger on this carb today.

I spent much of yesterday messing with the stock carb and its still not right!

On what bike zilly?