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


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Old 06-23-2019, 05:31 AM
Pygmygod Pygmygod is offline
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Join Date: Jun 2019
Location: Victoria - AUS
Posts: 26
Default First 2-stroke. Now to jetting!

Hi All, I've owned a Yamaha wr250f 4-stroke for 5 years.
Have recently bought my first ever 2-stroke, a 2007 EC200.

The bike came with an oversized tank so I assumed the jetting was a bit rich otherwise why would you put the big tank on, unless you're doing mammoth rides.

The jetting currently in the bike is:

Slide: 6
Idle Jet: 50
Main Jet: 178
Needle: NBHW
Clip: 2
Air Screw: 1

From the reading through some of the posts on here, the 50 pilot jet is probably far too rich.

I am also thinking the Air-Screw may need to be wound out half a turn as only 1 turn out is a richer mix, right?

It had a fair amount of spooge coming out the exhaust port as it needs new exhaust o-rings.

Previous owner was using Penrite Semi-Syn oil at 50:1.

Altitude around here is about 450mtr above sea level.
Riding temp ranges from 10C to 28C.

Considering this is my first ever 2-stroke, is the rest of the 'tuning' done by how it feels at each particular throttle%?
Will it be bit hard to determine since it's my first 2-stroke or is it easy-ish to just listen to the way the motor sounds to tell that it's off?

Thanks!


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Old 06-24-2019, 05:18 PM
Jakobi's Avatar
Jakobi Jakobi is offline
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Join Date: Oct 2010
Location: Australia
Posts: 7,844
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I remember going through all of this when I bought my first 2T.

Yeah nah yeah!

Not as many 200's in circulation so may find it a bit harder to get a baseline.

Rich is easy.. Really lean is easy. The closer you move to ideal the harder it gets to find just right, and shifts based on temps and engine loads etc.

Simple method is get it rich enough that it blubbers and then lean it off until it doesn't anymore. Want to feel blubber? Make it rich or pull the choke on.
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