05 CR250 PWK Needle A715/289R or CEK or other

[mxaniac]

Have an extra 05 CR250 that just sits around so I'm going to set it up for trail riding.  Tight stuff, higher elevation.  I've done the PWK conversion before on a CR125 with very good results, figured I'd do it on the 250 as well.  I've got the carb off a 2001 YZ250 coming my way, should have a #7 slide.  I've got all the pilots from 40-52 and a bazzilion mains as well.  My house is at 2300 feet and I usually go up from there.  Figured I'd start out with 48 pilot and 178 main.  Still can't decide on the needle.  Lots of recommendations over the years but I thought I'd solicit some input once again.  Favorite needle?

Edited July 26, 2017 by mxaniac
typo

[mxaniac]

Geez it's not like I asked which is the best premix (MX2T @ 32:1), whether Hannah should have let Broc by (no), or if aqueous based filter oil works as well as petroleum based (not around here).

[rtv]

On ‎7‎/‎26‎/‎2017 at 11:58 AM, mxaniac said:

Have an extra 05 CR250 that just sits around so I'm going to set it up for trail riding.  Tight stuff, higher elevation.  I've done the PWK conversion before on a CR125 with very good results, figured I'd do it on the 250 as well.  I've got the carb off a 2001 YZ250 coming my way, should have a #7 slide.  I've got all the pilots from 40-52 and a bazzilion mains as well.  My house is at 2300 feet and I usually go up from there.  Figured I'd start out with 48 pilot and 178 main.  Still can't decide on the needle.  Lots of recommendations over the years but I thought I'd solicit some input once again.  Favorite needle?

I would  use an NEDW needle in #3,  with a 42 pilot and a 170 main.

The N3EJ needle that comes in that 01 YZ carb is also pretty good. You will be able to use it with  the 48 pilot and 178/175 main.

Stay away from the 715/289 needle. It's just not very good in that bike.

The starting diameter of the CEK may be a little lean in your bike, if you want to try a single taper needle, try the CEJ and start with the 48 and 178/175 main.

[jeddclampette]

For offroad riding, I'm using a straight taper needle for a more linear throttle response.

Carb: PWK36 (off '06 KTM 250XC), DDK, #2 or #3 clp, 40 or 42 pilot , 168 or 170 main

W/ that single DDK needle, I've ridden 660ft-2000ft elev (TX,OK,LA), 4500-8500 ft elev (NM desert & high mountain), and 8k-10,6k Ft elev (all 4 corners of CO) for past 8 yrs & 500+hrs. Not one single plug has ever fouled up on me. Starts on 1st kick all the time. Pulls to the moon.

Stock '05 pipe, 13:50 gears, 80 hrs between top ends.

 

 

 

[mxaniac]

13 hours ago, rtv said:

I would  use an NEDW needle in #3,  with a 42 pilot and a 170 main.

The N3EJ needle that comes in that 01 YZ carb is also pretty good. You will be able to use it with  the 48 pilot and 178/175 main.

Stay away from the 715/289 needle. It's just not very good in that bike.

The starting diameter of the CEK may be a little lean in your bike, if you want to try a single taper needle, try the CEJ and start with the 48 and 178/175 main.

NEDW, Suzuki needle right?  Are those the ones you run a smaller main with because the tip is so small?

[mxaniac]

6 hours ago, jeddclampette said:

For offroad riding, I'm using a straight taper needle for a more linear throttle response.

Carb: PWK36 (off '06 KTM 250XC), DDK, #2 or #3 clp, 40 or 42 pilot , 168 or 170 main

W/ that single DDK needle, I've ridden 660ft-2000ft elev (TX,OK,LA), 4500-8500 ft elev (NM desert & high mountain), and 8k-10,6k Ft elev (all 4 corners of CO) for past 8 yrs & 500+hrs. Not one single plug has ever fouled up on me. Starts on 1st kick all the time. Pulls to the moon.

Stock '05 pipe, 13:50 gears, 80 hrs between top ends.

 

 

 

Interesting, so same diameter as the CEK but with a sharper taper angle and the taper starts sooner.  I have a 38mm though, that would probably account for the taper difference.

[TommyB 754]

RM250 needle, 168 main, 42 pilot

 

[ulmanb]

I had the same bike with the PWK carb a few years back, seemed to me it ran well with the DDK or DCJ needle. 

[mxaniac]

You guys with the NEDW running #7 or #8 slide?

[rtv]

2 hours ago, mxaniac said:

You guys with the NEDW running #7 or #8 slide?

 

You are going to want to use a #7 with that (NEDW) needle. If you are using a #8 slide, use a richer diameter NECH needle.

[mxaniac]

I went 168, 42, NEDW, and #7.  I'll have to ride it more to know for sure but so far it seems spot on.  Great job guys!

[c-slak]

On 8/22/2017 at 4:33 PM, rtv said:

 

You are going to want to use a #7 with that (NEDW) needle. If you are using a #8 slide, use a richer diameter NECH needle.

I'm running NECH #3 with a #7 slide in summer and at elevation.  In the winter I will probably go to NEDH #3.  I found they have more torque off the bottom and run cooler when doing a bunch of hill climbing.  The W needles always felt lean off the bottom to me.  I'm considering playing with different tapers for the fun of it.  Any other triple taper suggestions?  I know some here like the N3WJ I think?