250-500cc Wr 300 needle in the USA.

What,s the number of the needle that comes standard in the WR 300 in USA? And is there another one for the full power version? Just curious! I have the GAY needle in my full power version here, but have changed it.

Johnny

Johnny my fine frozen friend, here in the states one gets a 6BFY43-74 stock in the Mikuni TMX on his WR300.
The 6GAY69-74 is what came in my full power kit, and I'm not aware of any other full power kit needle numbers at this time.
If you're looking to tinker some more, when Sweden thaws out some this spring and it gets up into say the 50*s or 60*s, try the 6BFY43-74 with the clip in the 2nd notch down from the top,...a 460 main,...a 30 or 32.5 pilot,...and then fine tune your off idle crispness with your air screw. That's the jetting I run, and I'm happy with it. Mine makes great power and it's not too hard on my tank range either.

Thank you very much Rusty man! Okay, it´s richer in the middle then the GAY needle, and slightly leaner in the middle then the DEY needle i use now then! I have my DEY needle in second clip from the top, and it runs better then ever before, but maybe the BFY is perfect for the summer then!!

Yeah, that's kind of a warm weather set-up. Worth a try anyways.
If you do try it this summer let me know what you think of it.

Of course i will!!

What was your stock setup with the gay needle, pilot, main, clip postion, and air screw.

Standard setup is : Needleclip in 3rd position,45 pilot,430 main and airscrew 2 turns out. I personally don´t really understand why it is jetted with a 430 main when we have down to 25F here. I would probably run it way too lean with that. I use 470 now on the ice at about 30F(-5 celsius) and the plug is dark brown, slightly rich which is good on iceracing.

I'm currently running the GAY needle with the clip in the 3rd postion from the top, 45 pilot, 440 main and the air screw about 1 1/2 turns out. I've only ridden it one time with this setup, but it ran pretty good. May have to do some more fine tuning later, we'll see.

Ok, standard except richer main. What temperature do you have? Elevation? I had my airscrew 21/2 turns out at around 25F temp with GAY needle and 45 pilot. It was a bit rich anyway with that setup. My bike runs much better on idle with the DEY needle and 40 main. It also runs much better on coldstart. I have the choke engaged for at least 2 minutes without getting too rich at 25F. A perfect warmup, and no excessive smoke either. It just stands there and idles perfectly while i put my gear on!

Temps are ranging from around 35 to 55 degrees F. Elevation around here is @ 700-900ft above sea level.

My bike would be too rich on the pilot at that temp with a 45! I should try a 40!