[cbn70]

What are the differences in needles. From a DGH to a CEL. I have seen some talk on here as to which is a better needle to use, but what are the differences. thanks

 

[motofool250r]

Jet Needle Changes for PJ,PWK and PWM CarbsEach letter designates a size, taper, diameter and the chart above will help you understand it, basically its leaner

 

[mx250r91]

CEL will be leaner from 0-3/16 throttle due to the leaner diameter (L vs H) and richer from 3/16 to half throttle due to the length (E vs G) and the C taper will be slightly richer on the bottom and leaner on the top when compared to a D taper needle. When jetting it is ideal to only change one thing at a time so you can feel the effect on performance at the appropriate throttle position. If you go from a DGH needle to a CEL you are changing three parameters at one time and will make it difficult for you to discern the differences in needle taper, length and diameter and their effects at the appropriate throttle positions.

 

[cbn70]

What is everyone else running for needles? Just courious to see what I should be running, this is for a 330 kit with a 39 pwk.

 

[mx250r91]

I'm running a CCJ 2nd clip (CEJ-4) on my XC 269R

 

[acecarlos]

What is everyone else running for needles? Just courious to see what I should be running, this is for a 330 kit with a 39 pwk.

For a 330 with a 39 PWK, run a CEL or CEJ or DGH. I always like to tell folks to start with a DGH, only as a safe starting point and knwon reference needle.

Carlos

 

[cbn70]

that is good. I have some dyno time booked and just want to make sure I have some of the jets and needles that I might need.

 

[acecarlos]

Don't jet on a Dyno to peak performance, the engine will make more HP with leaner jetting on a Dyno, and then will burn up in the real world.

Carlos

 

[cbn70]

thanks for the advice. The dyno is more just for getting the jetting sorted out rather than trying to find out max hp numbers. The motor has always ran strong, but I could never quite get the bottom end sorted out as far as jetting goes, it was always on the rich side. So it is freshened up with a new piston and rings, and we will see what happens.

 

[acecarlos]

I suggest you get close on the Dyno, and final tune/jet by the 'seat of the pants' via Plug Chops.

Carlos