04 EC300 jetting?

[DWreck]

Just bought this bike a while back.

Finally pulled the carb to see what I had in there:

Pilot- 40
Air screw - 2 1/2+ turns out
Main- 178
Needle- N1EF clip at the top (leanest)
Slide- 7

I live in Stillwater, OK. Altitude around 900ft.

Bike seems slightly rich. Whenever I get into an opening where I can really get on it it seems as though it takes a minute to clean out and pull hard.

I just put a 35 pilot in it and it seems a little better but this was a quick run up and down the street at temperature near 100 degrees.

Just wondering what works for you guys. Have heard good things about LTR.

Post em up!

Thanks, Derek

[jeffd]

First off, I am jeff dunham, my best friend is Les Tinius of LTR... (so you know my bias).

From what Les has told me and in talking to other gasgas owners the LTR jetting kit works for most folks There is personal preference about how a bike should run, riding style and in what domain a person wants the bike to run cleanly. So talking about jetting is at times about as productive as discussing politics in a bar.

He told me has sold over 2500 jetting kits worldwide. They are sold through a variety of dealers and also on-line vendors (e.g. www.gofasters.com). If you contact Les (e-mail or phone)- he will set you up with a needle and a set of jets specifically tailored for your bike, altitude and environmental conditions. And yes, it is a needle made by keihin specifically for this carb (numbers machined off to protect the innocent)...

He will also help you dial it in after you receive it. It costs $36 and includes support and consultation with Les to help get things "dialed in" (look here for his qualifications).


I think it might be better to describe my experiences. What Les told me during the process, and what conclusions I drew from it all. This way you can seperate out my experiences from my conclusions and develop your own picture of the situation (and maybe factor in my bias too!). Then you can decide which way you want to go to dial in your jetting.

jeff

[jeffd]

FYI - another alternative is the carb mod done by RB-Designs. He inserts divider plates and also does carb boring.

So Ron, what do your customers see when going with this mod? And I notice that you can also bore the carb to 39 at the same time - with the plate in place will going to 39 also work for tight woods stuff? Or do you just recommend it for more open terrain?

I have actually thought of going to a 36mm carb for tight woods - but am now thinking the divider plate might be a better way to go... ???

thanks,
jeff

[jeffd]

And, also, it seems to me that RBs method of placing the seperator plate on the intake side of the slide would be alot more effective than placing it on the filter side of the slide. What does everyone else think?

thanks,
jeff

[RBD]

Jeff and others,

What the divider plate does, is reduce the size of the carb at the first half of the throttle opening. In effect it is like having a smaller carb which in turn makes the pilot circuitry more sensitive giving better throttle control.

This does give the bike more control at lower throttle settings. Once the slide passes the divider plate the carb just gets bigger and bigger as the throttle opens. This lets you have the same power delivery at WOT as it did before.

Boring a carb will give you better performance on the top end, but will reduce the low end sensitivity.

So a carb mod such as boring and installing the divider plate will give the benefits of a smaller carb on the bottom end and the benefits of a bigger carb on the top end.

Ron

[DWreck]

Hey guys, thanks for the honest/biased replies.

I'm not really trying to make the motor run like something else, just want to clean it up a little.

I will probably see if I can get a couple sizes smaller main jets and see if I can at least get the needle back to the middle of the clip. I'm guessing that if I don't like the way the bike runs after that it will be time to try a different needle.

$36 dollars is pretty reasonable for a jetting kit. I know I could spend that in a hurry if I started experimenting with different needles and considering the lack of knowledge that I have on the subject it would be like throwing darts in the dark.

I think the rb carb mod is what I have read about being popular with KDX owners. Not sure that is the direction I want to go right now. Cool to have the option though.

Thanks again, Derek