I recently added an FMF Powercore pipe so I need to rejet. Will be changing to KX200 snorkel soon. Within next year I hope to get the BB351.

So I was all set to buy the N1TC needle and Kawasaki jets but just read the thread declaring that the Dynojet needle is superior. OK great I'll go that route but for the 06/07 model years I've read people are using the KLX300 kit (Dynojet 2206) or the the 09+ KLX250 model years kit (Dynojet 2152).

So based on most current knowledge what is the best Dynojet kit for the 06/07 KLX250?

 

If you just want a good running setup with your new silencer and snorkel, either kit is fine when installed as per instructions.
With either kit, just follow the directions, with one exception, if you choose the 2206 kit, do not drill your slide.

If you are wanting maximum power levels with a tested/charted/proven CVK setup, that'll be lidless with either kit, a call to DJ for a DJ140 main jet, and a modified install procedure - For Phoenix and elevations up to about 2k ASL..

 

I've just in the process of going to the 351 BB and I'm replacing my CVK with a TN36-68. My CVK has the 2152 kit installed so no slide drilling. Are you interested in purchasing the carb?

 

Seems like the 2152 is the better option then. No drilling and just swap spring and main jet.

 

Thanks for your offer. I just need the needle and jets.

 

Here's an alternative opinion.

The 2206 kit is made for the KLX300.
It has a little more aggressive needle taper than the 2152, which should provide more mid-range fueling. Some have suggested the 2206 may therefore be better for a 351 kit than the 2152. No data that I'm aware of to prove either way. It's quite unlikely you'll be taking your carb back to stock, but if that's a concern, filling the slightly larger hole with JB Weld and drilling a new smaller one is no biggie.

I'm somewhat curious what DynoJet would recommend for a 351 kitted KLX.

 

It is certainly true that the 352 needle in the 2206 kit has a totally different "design" compared to the 228 needle in the 2152 kit. This means it will provide a different fuel curve from about 3.5k-6.5k RPM's @ WOT.
An armchair analysis of the 352 is easy to do, I took a picture of mine here, https://www.kawasakiforums.com/forum...rments-43117/- it should provide a leaner transition off the pilot system, maintain a leaner AFR during most needle operations, then goes rich really fast at higher needle ops RPM - compared to the 228 in the 2152 kit..

So, IMO, the 352 would serve up better AFR during all needle ops (3.5-7k) over the 228 WHEN you have the main jet large enough for lidless running (DJ140 and up)..

My 07 KLX300R is running stock exhaust(butt plug removed) and the 2206 kit, lidless, with DJ146/3N - It pulls unassisted, engine only wheelies in 1st and 2nd gear, 3rd gear wheelies on engine alone with a tug on the bars !!! And the 352 needle provides crazy powerful throttle response while riding in "needle operations".. Let me tell you why my KLX300R does this - at WOT, that 352 keeps the AFR properly leaned for mid range power (and throttle response) below about 6K RPM, then, just when the engine really wants a "jolt" of fuel - as it climbs a little past 6K or so - that 352 hits its' steep taper (down by its' tip) and "BOOM", you better be hanging on !! That DJ146 wants to overfuel the midrange but the 352 needle keeps the DJ146 under control - the 228 needle doesn't do that as well..

 

So, if a person wanted max power with a slipon or full exhaust but without MCM - 2206 could be the best option, combined with lidless, DJ140 (and up) main jets and a modified install procedure.

 

So I just talked to DynoJet. The gentleman told me that plenty of people have the 2206 kit in the 07 klx250 and are happy with it. He then told me the 2152 would not work in the '07. I asked why would it not work if it's the same carb and engine as the '09+ (I'm 99% sure of this please tell me if I'm wrong) and he replied it's not the same there are many differences. Then he got snotty and told me I could go ahead and try the 2152 but it's not going to work. Haha so now I'm really confused.

 

The gentleman is correct on the first part and wrong on the second.
There's some minor differences, with one being some wiring (I remember this from someone putting an '09+ in their 06/07).