EC250 Idles hardly ever

[Rokondon]

hello new forum,01' ec250 .The old ongoing problem even with the LTR jets,Idles real high simmers down and peeders out since the bike was new.Another poster on the other site said to try a KDX needle.I have tried several pilot jets,the thing either screams or has some other quirky unstable result.Running champion water pumper oil @50 to 1,or 45 to 1 sometimes.I ride within a few feet of sea level.Otherwise the bike runs great. I guess i will order some needles and get agrivated some more unless someone knows another starting point.Thanks for any help-Don

[roostafish]

Sounds like you should investigate a blocked passage in the carb body to me. Nobody's needle will help with idle, unless you've cranked the idle so far up that the gas is pulling through the main jet for idle, which I've heard of, so make sure that's not happening.

[MattR]

Could the high reving and cutting out be due to an air leak? Such as a small crack in the airboot or reed valve boot. I'm thinking that extra air could cause the engine to race and then the too lean mixture causes it to cut out.

[webmaster]

Lean condition sounds right.

If the suggestions above don't fix the issue -> Depending on the amount of time on the bike, you might want to have a leak down test performed on the motor to ensure that you don't have a leaking crank seal.

Motion pro has a nice leak down tester - kinda expensive though...

http://www.motionpro.com/motorcycle/...k_down_tester/

jeff

[Rokondon]

Hmmm,after reading these replies i think i will pull the carb off and check it more closly,and look at the boots.I like that pressure tester-too pricey though id rather just change the stator side crank seal.The seal on the clutch side would pull oil in and it smoke a lot...right?I did have one pilot in it where it would come to a normal idle from any throttle position for about 10 seconds and it would just go right to that barley running 150 rpm put- put for quite a while before it would shut off.Im going to mess around with it this weekend and i will be back to check forums too-thanks.-don

[LTRace]

Don,

Roostafish is right on track. When you look into the carb for any debris/obstructions and you are doing the cleaning, you will notice 2 discharge ports from the pilot circuit. The obvious one is the small hole in the throat downstream of the slide, the other is located directly underneath the trailing side of the slide. With the slide out, look straight down to the engine side of the slide recess, its there. Remove the jets and air correction screw, make sure both of these are cleared using carb clean and compressed air and verify they are flowing free. Clean the air correction circuit and while you are at it do the main fuel and air circuits too.

In addition to checking/replacing the L. crank seal you should check your reeds for any cracks or sealing issues while you have the carb off to eliminate other possibilities. Good luck.