2001 EC 300 Mid Range Problems

[Jamie195]

Jakobi... The silencer is one thing I have not checked. How important could this be for a the mid range problems as now I think about it, it is way too loud. I have ordered some more packing

Cheers

[nambo-trev]

Does it have a spark arrestor? If so is it bunged up or free flowing??

[Jamie195]

Originally Posted by nambo-trev

Does it have a spark arrestor? If so is it bunged up or free flowing??

I took apart the DEP end can and repacked it. Not sure what a spark arrestor is but I would guess it doesn't have one? Still midrange bog and running rich

Cheers

[Hawkeye]

Does the needle and/or slide show a lot of wear? With a bike that age, that could be a factor. Also, the orifice where the needle seats into could be worn larger?
You probably checked this, but is the main jet tight in the carb body? The reason I ask is that I've seen a KDX 200 run even after the main jet came loose and fell out! She didn't like any throttle openings more that 1/4 turn, but it still ran and made it back to the pits. A loose main could mess up the midrange, but I'd think it would blubber like crazy on top as well.
Well, I just wanted the opportunity to tell a cool, weird story that had us stumped out on the trail that day with the KDX.

[KTMAndy]

Jamie I've had similar issues with my 250 gasser. I found Jakobi to offer great advice.

For about 18 months I thought it was just a 2 stroke characteristic until I rode my friends 300.

However, since then I've been chasing the smooth torqy power.

I've replaced the stator which was looking fried. Then started re jetting which didn't do much at all....

However somewhere along the process I managed to snap the standard needle. N1EF so I've ordered a few more, but in the mean time Diggs gave me a CEK needle.

It's totally changed the characteristics of my bike. Far more than anything else I have tried.

I'm away to try it properly tomorrow but just riding on the tarmac I have no flat spot like before, bags of low end power. However the cut into the power band it's a little severe.

Current set up

Low jet #42
Main jet #175
#7 slide
CEK needle clip #3

Running 50/1 fuel also with Dep can and from the uk.

[mjtursky]

I agree with KTMAndy.

My EC250 runs well with the same MJ & SJ. But I use a slightly leaner CEL (straight dia) JN. That's because I use a 6.0 slide which gives a better signal to the nozzle to get the main circuit going.

[KTMAndy]

I struggled to find needles that I needed both from local dealers and from eBay. However I found gear4moto in the us and the needles arrived within 4 days. Apprx ?6 each.