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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc.

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Old 05-16-2010, 08:41 AM
slocalspode's Avatar
slocalspode slocalspode is offline
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Join Date: Mar 2007
Location: Southern Kalifornia
Posts: 452
Default Jetting Q: outside of the normal range.

Looking for suggestions. I have read all the jetting posts and I think most
of the jetting specifications are for off-road riding. Where you are on and
off the gas quite a bit. Most of the time off-road you are on the gas pretty
hard coming out of corners and climbing hills.
I am running my EC250SM on the street. With the exception of accelerating
away from a stop light. The bike spends a lot of time in cruise mode at between
1/8 and 1/4 throttle. With RPM's somehwere in 3,000-5,500 range.
My present jetting is/was a #7 slide. 45 pilot, 180 main and a LTR needle in
the second clip from the bottom. I put it there in an attempt to fatten up the
off idle mixture.
It ran pretty good, but would smoke quite a bit when accelerating from a stop
and when hard on the gas it seemed to lack any real snap. It felt too rich on top.
A couple of days ago. I moved the needle to the second clip from the top.
Thinking It might improve the smoking and restore some of the midrange hit.
It did reduce the smoking a fair amount, and the midrange power was a
slight improvement.
What got me concerned was when I was cruising along at about 60-65 mph,
(BTW, I am running 14/40 gearing), with the throttle open less that 1/4.
It felt like it started to bog down and loose power. I was afraid it was about
to seize. I gave it a hand full of throttle and it took off like it should. Only a few
miles from home. I slowed down and ran the motor at a lower rpm and lugged
the engine so I could give it more throttle and hopefully prevent a seizure.
Yesterday, I checked the plug. It is dry as a bone. With a very slight golden
color to the insulator. It looks to be on the lean side of perfect.
So I moved the needle to the middle groove and replaced the 180 main with
a 175 in hopes of clearing up the top end smoking and lethargic power
I have yet to run it like this.
Am I chasing my tail? Should I be looking at a different needle. One that
runs richer off the bottom? Replace the 45 pilot with a 48?
I am curious about your suggestions.
I may try my old stock needle, I think it was an N1EF, not sure though.
Thanks in advance for your input.
Jeff So. Cal.
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