EC 300 problem!!!!!!!!

C

clerky clerk

New member
Hi all, I am back with my problem ec 300, I still have the flat spot on full throttle, both low end and mid range are great, but wont rev any more from there. I have now changed the main jet for 175 then 172, I have checked inside the timing cover, its all ok and dry and clean in there, the pug is fine, the pv is working smoothly and opens when it should, I have new carbon reeds, a repacked silencer, cleaned and re-oiled air filter, and a full engine rebuild, but still, still, still!!!!!!!!!!!!!!!!!! the bike wont rev. I have tried the N1ef needle in 1st 2nd and 3rd slots to.:mad:
 
is it like your hitting a rev limiter? had the same problem just had to change the plug, the plug looked fine and the bike would start no problem just didnt rev. just change your plug for good precaution. most of the time its a simple solution b8eg
 
Clerky Clerk,

Since this is a new thread and not a continuation of your previous one you're getting the same answers all over again.

I think it's time to borrow if possible either a different carb and/or ignition and CDI and coil unit. You seem to have exhausted all the other possibilities with your work. For some reason I just wonder about the "new carbon reeds" you mention but it's just a hunch.

You did not mention when this started happening. Can you back track and think was it after anything in particular you did or changed on the bike? I assume it ran correctly at some point?
 
I have a new plug in, I changed from norm to iridium with no difference, and yes it does seem like a rev limiter, I have a standard gg expansion pipe and standard gg silencer, the bike has always performed in this way ever since I have owned it, thats the main reason for replacing everything and rebuilding everything, I agree with needing to try another carb and cdi unit, but i dont know anybody else who owns en ec300. I went out today for a 4 hour run on some fast tracks, I tried reving in 4th to the bog out and then dropping down into 3rd to see if it would rev that way but no, it just bogged staight away. I thnk it may be time for specialist to step in, Dyno possibly
 
Hey CC,
My 07 ec 300 used to rev out to about 7-7.5k and then do the same thing.
I did not go into it much, just checked coil wiring-ok, fuel tap etc - all ok.
When I replaced the original muffler with an Fmf powercore 2 off of a 98 rm the motor instantly reved out to about 9-9.5.
More power everywhere....now very happy.
Cheers Mark
 
In your other post you claim that you adjusted the float height so it will lay on its side without spilling fuel. DUH!
 
I will change the muffler/silencer thanks for the advice.
No sorry, you miss understood what Il ment to explaine; the carb used to overflow a lot so I opend it up,took out the needle and found a little debree in there, after cleaning it out and putting it back together it stopped overflowing to the point when it was tipped on its side, only then will it overflow. New exhaust, then if that doest work, a match and fuel ,then a new bike.
 
If you want your stator, coil checked send it away to west country windings i think there in surrey i sent mine away my starter coil was burnt that coupled with a new plug it was rapid again! like i said i had the same problem where it wouldnt rev out, now i got a problem where the bike stutters coming into PV its really fustrating me !! ive got an 02 250 SM, i would swap CDI's with you to see how it goes but im not totally sure but the 300 and 250 CDI are totally different? anyone help
 
Hi have the 2k-3 (larger flywheel) rear exit wires. Are these bike ment to rev out early? It has plenty of torque, but I have to change gear early as there are no high revs?
 
i have an EC250, what year is your EC300 ? i also have the 2k-3 ignition and it revs very well. your bike definatley shouldnt run like it is. if your intrested we could swap CDI's and see what happens? i live in Telford if i pay for my side of postage and you for your side? and back. we could try? cheers
 
The 200 is mapped for more top and mid than a 250 or 300. Thats why the increase in top end. As for the MC250 CDI Widebear did it and could not feel a difference.

If you look at the DE or XC 250 they came with 200 CDIs for the purpose of reving.
 
2 strokes 4 life said:
The 200 is mapped for more top and mid than a 250 or 300. Thats why the increase in top end. As for the MC250 CDI Widebear did it and could not feel a difference.

If you look at the DE or XC 250 they came with 200 CDIs for the purpose of reving.
Click to expand...

O ryt thanks! so i need to get either a DE250, XC250 or EC200 CDI? does it matter what year? ive got a 2002 EC250. Also i run the 2k-3 ignition as i use the bike on the road, will changing to a 200 CDI effect the lighting on the bike? Also do you know anyone who has the CDI im after? thanks
 
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