Needles for 421 Cub

[TeamRealtreeHD]

I recently switched from 33mm PWK's to 35mm PWK's. I am getting to the end of working out all the kinks in tuning. The needle is a tad lean with a CEL in it. As I started playing with the position, lowering the needle made it leaner of course. I raised the needle/dropped the clip and it cleared it up alot from my starting point (3rd/middle clip).

 

My question is... according to my observations and testing, CEL in my setup seems a tad lean with these 35mm PWK's. It was the perfect needle in my 33's but not for this setup.

 

I am not sure which needles to try to fatten up the needle. There are so many out there. It is not terrible on the needle right now on the second from bottom clip. But it can be cleared up some. I am just not sure which needles to try. It needs to richen up.

 

Any suggestions from you guys?

[TeamRealtreeHD]

Anyone have any suggestions? The bike got noticeably more crisp on the needle when I lowered the clip... a.k.a. raised the needle in the slide.

 

I am looking to get a different needle but do not know which one to get. There is so many. Different tapers, different thickness, etc.

 

It can be cleared up some yet. It's not terrible, but it's got a way to go so to speak.

 

I am looking for some opinions so I don't go buying $100 worth of needles.

[hercalmighty]

Hey Tony. It depends on where it feels fat. If it feels fat going from pilot to needle (right at 1/4 throttle to 1/3 throttle). At 1/2 throttle. Or going from needle to main (right at 2/3 throttle to 3/4 throttle). Figuring that out will decide what you have to lean out taper, length, or diameter.

[TeamRealtreeHD]

Right off idle is good. Up higher and main are good. It's dead (lean) at 1/2 throttle, give or take 1/8 up and down.

 

It's great off idle, into the slides opening. Great once the slides open a good bit.

 

I'd say half throttle.

[hercalmighty]

You want a shorter needle so get a CDL or a CCL. A CDL is one size shorter and a CCL is two sizes shorter.

[TeamRealtreeHD]

Thanks Herc. I think you may be right. As I brought the needle higher (lowered the clip) she cleared up significantly.

 

I am a little hesitant to get too crazy with this needle stuff. I am putting the bike away in 2-3 weeks, due to hunting.

 

And I am porting these cylinders over the winter, as well as upgrading to CPI's. So no use in going crazy.

 

We will see where the porting and CPI's gets me next season. Everything will be changing.

 

I got it running great in the time I switched the carbs though. Not much time on it, yet it is close to where I had it. Just some midrange that needs cleared up.

 

I do plan to get another set of needles here though for the weekend coming up, and to hold me over until teardown time.

[banshee332]

Thanks Herc. I think you may be right. As I brought the needle higher (lowered the clip) she cleared up significantly.

 

I am a little hesitant to get too crazy with this needle stuff. I am putting the bike away in 2-3 weeks, due to hunting.

 

And I am porting these cylinders over the winter, as well as upgrading to CPI's. So no use in going crazy.

 

We will see where the porting and CPI's gets me next season. Everything will be changing.

 

I got it running great in the time I switched the carbs though. Not much time on it, yet it is close to where I had it. Just some midrange that needs cleared up.

 

I do plan to get another set of needles here though for the weekend coming up, and to hold me over until teardown time.

 

 

I would put in a dgh or a del. thats a richer needle so that would help. My cub has dgh's and two of my buddys cubs I helped tune we put del in them.

[TeamRealtreeHD]

Butchy told me to try DEL or DJL too.

 

I am going to wait to make big jumps in needles due to only having 3 weeks yet.

Edited August 17, 2010 by TeamRealtreeHD

[wesw]

had good luck with dek needles

[hercalmighty]

I only sugested the CDL or CCL needle because it sounds like his taper and diameter is fine. He just needs a shorter needle