All 2st About the Mikuni/Keihin swap:

I received my PWK at lunch hour today...took 15 min to install

used the curved guide off the top of the TMX...works like a charm...2mm throttle play

also just for sake of information....Keihin main and pilot jets for the FCR are the same as the PWK


many thanks Kelly at Motorsportz

you can use the KTM cable , they use the keihin pwk in all the bikes.

So How's it run ? Let us Know

I put my PWK on my 08 CR125 and took it for a quick spin around the back 0.40. I'm running a 180 main, blue JD 4th from the top. A nice boost in low-end response and a good, steady idle. I need to take it someplace where I can get it on the main jet, but it's great so far. Thanks, Kelly!

The 175 main is perfect in my 144 up to 6500' which is the deep white stuff line. I can't imagine taking my pwk off again. It just works flawlessly as all my other pwk's have.

Walt

I now have three mikuni's that I am willing to part with for the price of scrap.

Walt

I figured it out the next morning

Thanks for the correct answer... it was late and I was tired-the next morning I swapped the shorter cable tube off the Mikuni for the longer curved one off the PWK. They just unscrew and have a locking nut to keep them secure.

I went riding yesterday and it ran great, no hiccups and it was very hot-near 90 degrees. It seems like I lost some top end (don't care) but I was amazed at how well this 125 lugs. Going riding the rest of the week and temps are back down in the 70's so we will see how it does...

I got out for a bit yesterday for a little Keihin tinkering on the 300.

I think I got it about perfect. 175mj, 45pj, N3EJ needle #2 clip.
Absolutely, positively freaking rips. That EJ needle and 175mj were major improvements. The bike is beyond crisp and responsive now. And I may have to retract my statements about the PC pipe being 'soft' cause it has monster power now. It just doesn't like to be jetted fat.

I'll probably end up with a 175/42/N3EJ #2 combo once summer hits riding between 800' - 2000'.

That damn throttle cable is killing me though. I have about 3/8" of throttle play before the slide begins to open. I was able to temporarily zip tie it up and get the slack out, but its only a temp fix as the slack eventually returned. When that cable is tight and jetting crisp the motor SINGS!

Gonna bring the stock pipe and silencer next ride and do some comparisons.

HI all, i just finish to install a brand new Keihin PWK AS 38mm on my WR300 2010. 1st, there is a big difference in the lenght of the carb and the Keihin is a real pain to install but when it is in place, it fit perfectly.

My jetting is 178 main, 48 pilot, Needle 48ddj in 3rd (middle).
My bike wont start...
I live in Quebec, Canada. Outside is about 50-60f today.

What do you think, can i go to a 42 pilot .
When the kid go on the bed, i will try to start it with the air screw allway in to see if the main and needle are ok but for that i need to start the bike !!!

*** Before my bike run like a champ with the Mikuni, i just want to see the difference...

Yes, the gas is at on
In a few minute when the kid sleep, i will go to the garage and play with the air screw, i dont have check it.

I would imagine you'll be jetted pretty rich with those jets. I rode around the 2000' level yesterday, temps in the 50's and found the 45/175 combo with the needle in the #2 clip about perfect. A little fat on the pilot, but could have been tuned with the air screw.

And you're right... trying to squeeze the Keihin in there is a hassle. That shock spring is right in the way!

PC,

If you would join the 125 crowd you would learn to love all the room to work on these kind of things.

Walt

I have try to play with the air screw (now set at 1 1/2) and thats dosent work.
The bike is impossible to start. If i put the fuel to off on the tank + remove the plug and kick a few time without the plug to clean the cylinder and retry, the bike run for 1 seconde and die immediately.

Tomorrow i will put a 42 pilot and retry, but i dont think this will work...
What do you think is the problem ??? Is it possible that the idle screw is completly off ??? How many turn do you have on the idle screw.