umm, yes the new kit does come with a 5/32 drill bit, as you can see on their website.
I don't think they give you a drill bit for nothing.

 

that drill bit is for drilling out the a/f screw cover. read the pdf, no mention of drilling the slide. look at the final power values, it's there in black and white.

 

You crack me up. One dyno run is on a 97 klx300 the other is on a 09klx250 different bikes with different timing advance etc.....how in the world is the klx300 kit going to give you more power than the 250 kit?? The main jet gives you max power and the 250 kit has all the same jets as the 300 kit plus some more.

The new spring probably eliminates the need to drill the slide but there is no reason why you could not still drill it and see if you like the results.

But damn $68 for the kit.....I would just buy a couple jets and the 300 needle from Kawi directly .... save some money for the exhaust.

BTW whoever posted about emissions... neither kit will help you pass those and neither is designed to do so.

 

the 300 kit is a more effective kit at making power gains as evident by dynojet's numbers. you can't argue against that. the 250S kit is not as focused on performance as evident by it's low power gain. it is evidently tuned to be more emission friendly. argue all you want, but it's there in black and white.
shoot, it's like debating a brick wall around here, seems no one can see the logic anymore. I don't even know why I'm defending DJ, I'm all for ordering the keihin parts and saving dough as well. too bad it takes so long to get these parts from japan vs. the dj showing up in two days.

 

Iowa you are an idiot...what part in one kit will provide more power than the other??? The main jets are the same. Just different needle for midrange and spring for response. More effective at providing power ROFLMAO.

Just accept the fact that your 09 250 will not benefit from jetting and a pipe as much as a klx300 will....get it.

 

Wide open throttle is what these dyno # represent but with the cv carb, vacuum is what drives it per rpm so I'm sure some of this represents mid range (needle position) but I'm sure it doesn't stay there long then it in the main jet, so I'm sure the kits are similar drivabilty is what maybe different not absolute #'s.


Kevin

 

I highly doubt emmissions has anything to do with the '09 kit. Plastered all over the DJ website are warnings that these jetkits are for racing or off-road use only...

I plan on ordering the kit for the '09 in the near future, and I'll be removing the snorkel from the airbox lid. I'll report on what I find soon as I get this mod going

 

+1 exactly, smart decision.


Iowa, just marketing? I wonder if Iowa has ever been to a marketing class? Yeah, DJ makes an OFF ROAD ONLY jet kit, with extra parts, you know, more jets, a spring, different needle and then runs a KLX250s for dyno time and makes specific instructions to support the install...you know, just for marketing reasons. Sure, that makes sense. The only way you could support your comments is if the KLX250s kit was EXACTLY the same as the KLX300 kit, but COST MORE, that would be a marketing spin, you know, product placement, up selling a product to cover a larger consumer base?

And yeah, you know, DJ makes a jet kit for KLX250s specific to keep the emissions...IOWA, you are such a bone head sometimes, if DJ could make the jetting on the KLX250s such that it made MORE POWER but was still emissions legal, then why in the HELL DOES IT NOT COME FROM THE FACTORY LIKE THAT??? The answer is...BECAUSE IT IS NOT EMISSIONS COMPLIANT.

Oh and you are comparing the power gains from jetting on two different engines and that is an apples to apples comparison? So, let's see, let's say a KLX250s makes 20 HP and a KLX300R makes 25 HP, and the jet kit gives a 10% boost in power, which bike would make more power? The answer? The KLX300R of course, why, because 10% of 25 is more than 10% of 20, no matter how you look at it. You cannot say a jet kit made for one bike is better because that bike makes more power..and you are complaining about brick walls, were you dropped on one when you were a child? This is such common sense it isn't even funny.


Man, really, sometimes the putrefied gunk that spews out of your mouth on some of these threads rivals the best poop my daughter places in her diapers.

 

I ordered my kit today...UPS....Yippee....I heard that my Fedex only delivers Tuesday-Saturday...So I saved the coin and went with UPS.....

Oh I went with the 300 kit for now...Makes sense both ways but figured the experience with this forum and peeps with this kit would be better for myself...Probably get the 09 kit next year...Or try another carb...

 

I may be not getting it, but does anyone have any idea as to why the 09 KLX 250 DJ Kit has a different spring? When I looked at the Kawasaki factory part numbers for my 07 KLX 250, the 09 KLX 250 and the KLX 300, they all have the same part number. Since I have the 300 KLX kit in my 07, I thought maybe the spring is "magic" and so I emailed DJ Tech to see if the spring is available separately and the quick response was that they do not offer a kit for the 07 KLX 250? -Is this implying that something is different in the 09 carb or just someone who is reading a script. Anyway this Tech indicated that the spring is not available.
Would a lower spring rate, if that is the case, allow for quicker throttle response?