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


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Old 08-24-2019, 02:17 PM
Doc Brown Doc Brown is offline
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Default yes, another jetting question

My friends GP 300 is on stock carb setting, except that the main jet is a 170 instead of the standard 175. I checked the float height and reduced it a bit as it was set too high and the carb spilled gas as soon as you leaned it over 20? degrees.

So the current set up is:

N1EF needle in the third groove, main jet 170, pilot jet 42, AS 2 turns out.
Altitude: 660 to 1200 feet
Temperature: 88 F
Premix: 60:1 Silkolene Fuchs Titanium Oil

Surprisingly the bike runs very well with the N1EF only burbles a bit down low. Its mostly ridden on the pilot jet, normally does not get high revs. Its overly rich and always has much spooge on the exhaust.

I have a NECW needle on the shelf and would like to try it. I do believe it would work very well with the current jets but I don't want to ruin his bike. If it was mine I would not hesitate a second and try it.

Can anyone tell me the differences between the two needles. I know the NECW is leaner than the N1EF but I don't know much about the N1EF. I expect the bike to run leaner everywhere without the danger of seizing.

I can't ride behind my buddy because his GG smells like its spraying pure gas out of the exhaust. I had a headache last time I followed him...


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Old 08-24-2019, 03:54 PM
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rodent rodent is online now
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Default

When I changed to the NECW alone, it felt a lot cleaner though most of the range. Nothing to substantial but I could definitely tell by the seat of the pants.

My bike also runs best at around 2 turns out on the mixture screw but I am running 1 1/2 till I get it sorted.....I don't want to lean the sucker.

My bike is still running fat and burbling up top, sometime this week I'm changing from a 172/42 down to 170/40 to see what happens.

If your 2 turns out on the pilot, maybe drop it down to a 40 and try to get the mixture screw to around 1 turn.

All that said, my bike is an ec not a gp.
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Old 08-25-2019, 04:37 AM
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Jakobi Jakobi is offline
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NECW has a longer and thicker straight section. Much leaner off idle.. That is where most of the difference is.. 0-1/4 throttle range. Find the clip position that gives best feel from 1/4 upwards... Main will be comparable.
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Old 08-25-2019, 04:44 AM
Doc Brown Doc Brown is offline
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Quote:
Originally Posted by rodent View Post
When I changed to the NECW alone, it felt a lot cleaner though most of the range. Nothing to substantial but I could definitely tell by the seat of the pants.

My bike also runs best at around 2 turns out on the mixture screw but I am running 1 1/2 till I get it sorted.....I don't want to lean the sucker.

My bike is still running fat and burbling up top, sometime this week I'm changing from a 172/42 down to 170/40 to see what happens.

If your 2 turns out on the pilot, maybe drop it down to a 40 and try to get the mixture screw to around 1 turn.

All that said, my bike is an ec not a gp.
Many thanks rodent! Are you on the NECW right now? I will try the NECW in his bike with the 170 and 42 jets then see how its running, if necessary reduce the pilot to a 40.
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Old 08-25-2019, 04:49 AM
Doc Brown Doc Brown is offline
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Quote:
Originally Posted by Jakobi View Post
NECW has a longer and thicker straight section. Much leaner off idle.. That is where most of the difference is.. 0-1/4 throttle range. Find the clip position that gives best feel from 1/4 upwards... Main will be comparable.
I see, that's probably why people recommend it when they have the well known "low down burble".

Many thanks Jakobi !
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