I have been surfing the site for a couple of days and have come up with a few questions:
1) Why are Dyna Jet kits used so much? Seems like the confusion caused by the different numbering system and potential flow rates outweigh the cost of buying Keihin jets from a dealer.
2) Are the socket head screw kits available for this bikes carbs (and the whole bike for that matter)? I hate cross head screws stripping on float bowls and diaphram covers.
3) Should there be a sticky chart for jetting various standard set ups to get in the right ball park with mods ie stock box/K&N filter/FMF pipe? I know elevation will change things up a bit but it may help the DIY'er to buy a few stock jets from the Kwack dealer instead of changing the numbering system on a single carb bike.
4) What is the Kouba screw, why use it and where odes it come from?
I don't have a KLX250S yet, but I will very soon. I really like this forum for its activity and helping spirit.

 

Brooksie you are prolific today
I think the dyno jet kits are popular because they are kits. It's easy, One stop shopping. you can definitely save some money and buy needles and jets separately ( I did ), but you have to do some homework.

The "Allen" bolts I put on my carb came from the local hardware store. I'm not aware of any kits for our cvk carbs. I do think replacing the Philips head screws is a great idea. It's much harder to cam out a socket head screw vs a Philips head.

There was a chart that had everybody's jetting and altitude etc , but I'm not sure it was here on KF, I'll look around.

Kouba screw is a replacement air fuel mix screw that has a T handle extension. Makes it easy to adjust air fuel mix.
Dan

 

Kouba screws
"T"-Handle FuelscrewAir/Fuelscrews

 

Yeah, I've got the bit between my teeth, allright. I'm ready to jump in this pool! Got a CL listing going up looking for used and have been pestering the dealer on new ones, so it'll happen soon. Thanks for the info.
I've always liked allen heads on everything, especially carbs. Makes the yearly cleaning easy and allows quick access to areas where those devil OE bolts seize. This comes from a very long multi-cylinder street bike background.
I like keeping OE jets where possible. I am a firm believer in "set it and forget it" when it comes to carbs (and suspension, too). Just keeps thing simple and allows more riding time.
Thanks for the swift answers and great link.

 

+1 What Dan says ^

Also, some here have argued that the dynojet needle is preferable to the N1TC kaw needle. I like it because it is a kit, with instructions, and with a variety of main jets to help you get it right without having to order more jets. It will NOT come with a pilot jet, but I don't feel that a larger pilot jet is usually needed for the stock 250, especially if you drill the enrichment jet for easier starting. I used the #2206 kit which is listed for the KLX300, but which does work in my '06 and reported to work in recent models also.

I picked up my Allen heads from Ace Hardware. One of their local stores has a fantastic selection of metric stainless fasteners.

I've seen the chart that Dan mentions. It's in some of the old posts, and you may find a link to it in one of the stickies.

 

Thanks, great point. The tech at the dealer is very savvy with this bike and is just daring me to buy one! I'm digging in on the cold start issue too! Thanks again!!

 

You can pick up OEM jets here, You can get the allen head screws there too.


Jets R Us mikuni, keihin, hitachi, holley, jets and carb parts

I just ordered a variety for my bike to dial in the jetting.

My word of warning is to not just depend on what others have done. I read and jetting my carb to what many others have. My bike ran extremely rich and I got terrible fuel mileage. So either my bike is extremely different than others or possibly others just rejet to what someone else said and never check how it actually performs.

 

Thanks for the heads up and the great link.

 

The needle that Dynojet makes has a dual taper on it. The keihin needles are single taper. The needle is the center of their popularity.

Ride on
Brewster

 

You pay the extra money for the kit for all the research they did. I saved lots of money by just usin jets I had layn around. Some extra research yourself will save you money IF you dont mind usin the computer.