My 06 EC300 not running properly!

[ju571n]

Just purchased the bike and it doesn't seem to run right.

It just stutters when trying to get in the upper revs. The low end seems good but that is about as good as it gets! I reckon I could run faster than it when it gets to the stuttering part!

It is running a 175main, 38 Pilot and N1EG needle on the second clip (tried 3rd also). Can you guys give me any advice on why it wont rev out properly? Is the main jet too lean?

I live in Australia. 0-1000 elevation. 25-30C

any advice would be appreciated. Cheers.

[buzzard]

It could anything, jetting, crank shaft seals, plugged exhaust, and on and on. This does sound like what my 250 did with a bad ignition. Put an inductive timing light on your bike, and see that the ignition advances with an increase in RPM. My defective ignition advanced to midrange, then dropped back to no advance. It ran exactly as you describe.

[PEB]

The little nipple on my spark plug was loose last time I rode and the bike ran as you describe.

[gasIdaho]

My EC300 ran like this when my power valve was stuck open(or shut?) . The nut holding the PV actuator arm had fallen off.

[ferguscawley]

My guess is power valve is staying shut - mosre thabn likely due to the linkage arm coming off - remove rhight hand side power valve cover (you will have to remove exhaust front pipe first) and see if all is OK in there.

Fergus

[ju571n]

checked the powervalve and it seems to be opening when I rev the bike. Any more ideas?

[ju571n]

I think it's the crank seal that is the problem, caused by worn main bearings! There is about a mm of movement when I move the flywheel up and down. Does it sound like it would be the cause? It also seems to be smoking a lot and the plug was pretty oily when I pulled it out..

[ju571n]

Revved her in neutral with the plug in finger tight. Heaps of oil came out the plug hole....crank seals it is by the looks of things.

[GMP]

That won't tell you anything. A rolller crank bearing as used in the GG has some detectable radial play when the flywheel is moved up and down, even on a brand new bike. A bad crank bearing will also cause more vibration and a roaring noise from the lower end. Remove the flywheel, if the seal is bad you will see evidence of it in a leak. If the flywheel side seal is bad, it will usually have lean symptoms from sucking air. This does not sound like your problem. If the primary seal is bad, it will smoke really bad, much worse than rich jetting.

Think simple at first. Check your float level, float valve, and overall carb condition, from what you describe it just sounds way too rich on top for some reason. Reeds next, and go through your electrical connections including the HV coil wire. I see by that pic the plug cap has been changed, perhaps an attempt to fix this problem and maybe not correctly. Check/clean the coil ground to the frame and the stator plate to the case. Lastly CDI and coil if you can swap with someone to troubleshoot.

[ju571n]

The oil does not look like 2 stroke oil coming out of the spark plug hole. It is more the consistency of gear oil. It is blowing excessive amounts of smoke that appears to be more whiter in colour. There was also water on the plug which to me indicates that the water pump seal is broken also leaking through the right side crank seal. I have changed all the fuel so I dont think the water could have come through there.