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


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  #1  
Old 10-06-2013, 11:47 AM
Jamie195 Jamie195 is offline
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Default 2001 EC 300 Mid Range Problems

Hello,

Recently purchased a GG EC 300. The bike starts easy and idles fine etc. However it has a huge flat spot mid range where it stutters and doesn't feel like it wants to even go through the power band in lower gears. Once past it gets better. It had BR8EG (Very black and wet) so I have changed to BR10EIX as was recommended by the local motocross shop. Carb has been cleaned and has slide #7 and needle on leanest setting. Main Jet is 178 and pilot jet is 38, I live in the UK so elevation is 0-500ft. Reeds look fine and powevalve looks fine. This is my first enduro and 2 stroke so would really appreciate some help and advice, even someone can tell me what size jets to try etc

Thanks very much
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Old 10-07-2013, 12:10 PM
mjtursky mjtursky is offline
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If I'm not mistaken, a BR10 is a colder plug and would foul easier then the 8. If you are running the factory JN, I would recommend the next leaner OEM JN. In most Keihin PWK carburetors, the straight diameter can influnece up to 1/4 throttle. So very little would change by moving the clip position. That would influence 1/4~3/4 opening.
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Old 10-14-2013, 03:52 PM
Jamie195 Jamie195 is offline
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Quote:
Originally Posted by mjtursky View Post
If I'm not mistaken, a BR10 is a colder plug and would foul easier then the 8. If you are running the factory JN, I would recommend the next leaner OEM JN. In most Keihin PWK carburetors, the straight diameter can influnece up to 1/4 throttle. So very little would change by moving the clip position. That would influence 1/4~3/4 opening.
Thanks for the reply... Stuck with the BR8 and I'm just going to try a 172 main jet and leave the pilot jet as a 38. Or do you have any more advice?

Cheers
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Old 10-14-2013, 06:11 PM
Jamie195 Jamie195 is offline
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Also does anyone reccomend the RM250 NEDJ needle, I imagine I can try this with my current jetting as its a leaner needle? Although I've only seen people on the forum using this needle on much newer bikes.

(Not familiar with jetting etc)

Cheers
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Old 10-14-2013, 08:32 PM
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Jakobi Jakobi is offline
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An older model won't like a diameter that lean.
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Old 10-15-2013, 12:04 AM
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wrench wrench is offline
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Are you getting a lot of smoke from the exhaust when the power drops off?
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Old 10-15-2013, 01:48 AM
Jamie195 Jamie195 is offline
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Quote:
Originally Posted by Jakobi View Post
An older model won't like a diameter that lean.
Ok is there any you would reccomend? Or would you downjet first
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Old 10-17-2013, 05:21 PM
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nambo-trev nambo-trev is offline
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Does it have a spark arrestor? If so is it bunged up or free flowing??
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Old 10-23-2013, 03:47 PM
Jamie195 Jamie195 is offline
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Quote:
Originally Posted by nambo-trev View Post
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
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Old 10-23-2013, 04:54 PM
Hawkeye Hawkeye is offline
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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.
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