EC300 Idle Revisited.

[Skidad]

Yes the Kawasaki MX bikes have the notch in the slides. You can get them for about $55 online in a 7 or 8 size but I dont think that's the issue really. I do want one of those notched slides to do some comparison tuning.

You could have an air leak in the throtte body where the needle jet and idle circuit assy attaches with those tamper proof torx screws. The choke plunger could be leaking air. A guy on KTM Talk went so far as to completely block the choke hole in the bell housing and found the carb worked better but would still start.

I say you need to get someone elses 38mm carb and swap it into your bike with your jets and see what happens. This will quickly determine if the carb has a problem.

[Ud_luz]

I talked to Ron at RB. He said that it's unlikely it's the carb after I told him what all I have done. In his opinion it's a classic case of a squish issue. I told him I'd send him the head and the carb but he told me to save my money and do the head. If that didn't clear the issue up, and he was pretty certain it would, then send the carb in. He told me this carb is more sensitive than what I'm used to with the KTM version but from my description this is head related.


I'm off to take the head off and send it in. I will follow up with a report.

[oldgoat]

Well ???. Did the head mod fix it ???

[Ud_luz]

Originally Posted by oldgoat

Well ???. Did the head mod fix it ???

Well, me being the "I'll get around to it" and having a garage full of other dirtbikes to ride, I haven't sent it in. Actually I'm dealing with a kind of weird low compression issue before I send the head in.

[skid jackson]

thats the problem with having more than one bike .. if one breaks you just go ride a different one .... eventually you end up with four or five broken or ill running machines!!

[Ud_luz]

An update. An o-ring was missing in the jet block. I replaced the carb with a new JD AS but couldn't stand not knowing what was wrong with the old one. I replaced the o-ring and made a new gasket, reinstalled the carb and the bike ran perfectly.

Who would have thought?

[moto9]

Originally Posted by Ud_luz

An update. An o-ring was missing in the jet block. I replaced the carb with a new JD AS but couldn't stand not knowing what was wrong with the old one. I replaced the o-ring and made a new gasket, reinstalled the carb and the bike ran perfectly.

Who would have thought?

Hey,
Can you be more descriptive with the adverse symptoms and exactly what,where parts were missing.
The only reason I ask is a guy I ride with is have similar jetting issues with his 09 ec 300.

It has a hanging idle that gets worse as the bike heats up...wack the throttle a few times and it will drop.
It's jetted with a 45PJ 180MJ and a cck needle...my 08 is jetted pretty close to that and it runs great.

So, we threw in a 48PJ and it still has the hanging idle, I played with the air screw and I can get it to idle down but then it almost dies and stalls a lot....with a 48PJ it should be way on the rich side.
My first thought was some sort of air leak....I wonder if his carb as the same missing part(s)
I tried to find the jet block o ring in a exploded view of the carb, but it's not shown ???
Let me know
Thanks !!!

[GMP]

I assume you have to remove the security screw (Torx?) and remove the nozzle assy.

[stainlesscycle]

Originally Posted by moto9

I tried to find the jet block o ring in a exploded view of the carb, but it's not shown ???
Let me know
Thanks !!!

mikesxs.com lists a pwk jet block gasket and o-ring. i also ordered a float needle from them. the float needle was the wrong one. i have not opened the jet block up to see if the gaskets they sent me are correct...

you do need to remove the security torx - the last jet block i opened up was on a mikuni tmx, and it was trashed in there. after that i found out you cannot order a jet block gasket for a tmx. urrghh..

[Gasgasogeros]

hi where can by this oring ?