Does this sound right?

[grump99]

I have been fighting a bog ever since the weather has cooled down. Bike ran great in the summer with 150/40 DEK-3. Since a couple days ago temps have been down to the mid 30's. I had been going up on jet sizes like crazy and have ended up at 158/48 DEK-4.

Bike seems to run great with this jetting, bogging went away, gained a nice "ring-ding" sound, and revs out better.

My concern is that this seems awfully rich to me, especially on the pilot. However, the bike won't run for squat with a 45 pilot or a 155 main.

Does anyone else run jetting this rich in the colder months? If it gets any colder, I'm going to have to find a 50 pilot jet somewhere . I have also checked for air leaks and found none.

Any feedback is greatly appreciated.

Here is the relevant info about my bike:

'04 KDX 200
FMF torque pipe
Stock silencer
V-force 3 reeds
RB carb mod (modified stock carb, stock cylinder head)
Air box lid opened up
Elevaton: 400 ft above sea level

Thanks!

Tony

[krazyinski]

Dont you just hate winter, it screws with me for the first couple of months then along comes summer and here we go again. Pilot seems a bit rich. How far out is your mix screw? have you tried changing your ratio to richen things up?

[grump99]

Air screw is about 2.5 out (second sweet spot). I run 40:1 mx2t. I didn't need this big of a pilot last year (had a CEK). Bike idles well and is not loading up or fouling plugs. Is a DEK leaner at low throttle position compared to CEK?

[grump99]

I think I might have had a speck of dirt or something in one of the carb circuits. I took it apart and cleaned it. After cleaning, it ran crappy (obvious rich) with the 158/48, it wouldn't even idle. I tried 155/45 and it was much better. I guess I need to get a fuel filter . Will try 155/42 tommorow. Thanks for the advice.

[IdahoCharley]

Air screw is about 2.5 out (second sweet spot). I run 40:1 mx2t. I didn't need this big of a pilot last year (had a CEK). Bike idles well and is not loading up or fouling plugs. Is a DEK leaner at low throttle position compared to CEK?

To answer your question - a DEK IS leaner at low throttle position as compared to a CEK at the same clip position. Glad you found your problem.

[grump99]

Thanks man. I was running on reserve when I started to have trouble. I found a few specks of dirt in the float bowl. I am guessing thats the culprit. Hopefully a filter will solve that issue.

[krazyinski]

ITS always something simple