2006 EC300 problem
 

okay I have search for similar problems here and there are plenty
my bike is running like the choke is always on,it wont clean out or rev out,it has no power at all from 3/4 to full throttle
the top end has very lttle time on it,it has plenty of compression and has a heavy kick to start it(compared to my 200)
heres what I have tried:

*changed plug
*fresh fuel
*repacked silencer and checked for blockages
*burnt out pipe and checked for blockages
*changed air filter
*cleaned carb four of five times
*changed carb from 200 with same results
*tried dropping the needle to lean it out
*swapped CDI from 200
*removed both powervalve covers checking for opening

few things I will be trying:

*swapping out coil and plug wire from 200
*checking reeds
*disconnecting kill switch
*taking off the tank and looking for a broken wire?

any ideas? am I overlooking something simple?
Bike ran fine at our last enduro in November,
took it apart last month to replace kicker gears and now
I have this problem

*could it be a magneto problem

Sounds like a CDI or Magneto problem for sure. Also cheeck those reeds too.

Check your reeds.

if they're OK, then you may have either of 3 problems :

a head gasket problem - are you losing any water ?. Is the exhaust showing clouds of steam ?

a crankshaft seal problem (on gearbox side) - is the bike excessively smoky ? - are you losing tranny / gearbox oil ?

An electrical problem : Try this and see if it solves the problem - remove fuel tank - you will see a yellow wire connected to another yellow wire via a spade connector by the front frame section bewteen the headstock and where the frame splits below the radiators. This is the AC gfeed from the 2K3 generator to power the lights etc. Disconnect and tape up this wire and test ride - if problem disappears then your rectifier may be faulty or the wiring behind the front light is faulty.

Let us know what you find ;)

Thanks

Fergus

I have tried a CDI swap already with my 200,the 200 runs fine with the 300 CDI also

WILL CHECK THIS TODAY

tried everything above:
*reeds ok no fraying,laying flat
*changed out coil and wire from my 200,no change
*disconnected yellow wire under gas tank,no change

My 300 used to do this in hot humid weather. Since having RB do the head
squish and using the CCK needle it runs MUCH better.

If it ran fine before you pulled off the side cover I would look there. Double check that the power valve is moving. I would pull off the pipe, remove the right PV cover,reinstall the pipe and run the motor and rev it up to make sure the PV is moving. Just my guess.

already did that and its moving,I did say that after taking it apart to change the kicker gears it hasnt run right since,but truthfully,it sat from november till january and I didnt try it when I took it out of my shed before I removed the side cover to say it was doing it after the repair

My 06 is doing the same thing and it is driving me crazy. I am not a mechanicly minded person so it is getting very expensive!!. Things that have been done
Carby Cleaned
new float valve
reeds checked
power valve checked
ignition and wiring
new piston and rings
new cranck shaft seals
new fmf exhaust
all new gaskets
new needle coming tomorrow
I am trying to get her ready for sale.....it has cost me close to $1500 already!!!!

It will be for sale as soon as this issue is sorted if anyone is interested
Brand new chain and sprockets
Brand new fork seals
LED tail light
Race Tech suspension
Brand new FMF silencer (powercore2)
Brand new Force raiator guards
top end rebuild (not run in)
12 months ACT rego
Brand new clutch master cylinder kit
Rockstomper footpegs
barkbusters
Bashplate
I am selling because I found a brand new 08 WR450F at a good price and thought I would try something different
I am In Canberra Australia
PM if interested

If you have checked all the items I mentioned, then try / check the following :

Disconnect your kill switch by the CDI (its the black wire with yellow stripe that goes into a 'bullet' connector about 2 or 3 inches from the CDI) - disconnecting it here will eliminate any potential wiring fault between CDI and kill switch itself.

Try the coil/ HT lead/ plug cap assembly from your 200.

If your jetting is OK and all the mechanical necessities are OK, then it must be an electrical prbolem.

Have you checked the magneto and pulse generator (pick up coil) resistances ?

Magneto wires are the black/red and red/white wires going to CDI - you should have approx 13 ohms across these wires.
Pulse generator/ pickup coil wires are the red and green wires going to CDI. You should have approx 100 ohms across these.

Easiest way to check these is disconnect CDI and use a couple of paperclips to stick down into the CDI connector on the loom (holes in connector are too small for regular multimeter probes)

Best of luck !!

Fergus