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


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  #1  
Old 01-12-2017, 09:36 AM
muddertrucker muddertrucker is offline
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Default Weird jetting!

So i took my carb off today to verify what i had in my notes because the jetting values i had were no were near what everybody elses are.

My bike is a 2011 ec 300 that i think is all stock but the jetting i have is 145 on the main and 38 on the pilot. I have no idea wich needle is in there and cant see any writing on it. The slide is a number 7.

The bike runs good, smokes only a little and the plug is actualy pretty dark.

Any ideas as to why my jetting is so different?


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Old 01-12-2017, 10:44 AM
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Quote:
Originally Posted by muddertrucker View Post
So i took my carb off today to verify what i had in my notes because the jetting values i had were no were near what everybody elses are.

My bike is a 2011 ec 300 that i think is all stock but the jetting i have is 145 on the main and 38 on the pilot. I have no idea wich needle is in there and cant see any writing on it. The slide is a number 7.

The bike runs good, smokes only a little and the plug is actualy pretty dark.

Any ideas as to why my jetting is so different?

The main is too small, the bike will be asking for more fuel. I run a 40 pilot and # 2 from top for the needle. I'm about 5hr from you.
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Old 01-12-2017, 10:55 AM
muddertrucker muddertrucker is offline
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Theoreticly it should i know. But it definatly is running good.

Just wondering what could make it need such a small main jet.
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Old 01-12-2017, 12:07 PM
Neil E. Neil E. is offline
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Are you actually riding hard enough to get on the main jet? The main jet is mostly controlling the mixture past 3/4 throttle and you've got to be riding with the throttle almost pinned to see what effect your main jet has.

A small main would require a needle with a very small bottom diameter.
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Old 01-12-2017, 12:18 PM
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Are you sure it isn't a 175 main?

If you don't see any markings on the needle it may be a jetting kit where the markings were removed to keep someone from copying it. e.g. old LTR jetting kit. This is a keihin needle.

If you don't know which needle it is - I would pick up a needle suggested elsewhere here - e.g. "suzuki needle" or "yamaha needle"...

With all replacement (improvement) needles - you typically run a richer pilot jet and reduce idle setting to better separate the carb circuits (high/low). My experience (which is a bit dated) is that you should see a 42-45 pilot - maybe a 40 - but definitely not a 38 if things are set up "well" (given conditions are not extreme).

jeff
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Old 01-12-2017, 01:03 PM
muddertrucker muddertrucker is offline
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Default Weird jetting!



You can see it pretty good in the pic but in real life it's even more clear that it's a 145.

And no I don't tend to reach above 3/4 throttle except on the rare occasion.


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Last edited by muddertrucker; 01-12-2017 at 03:08 PM.
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Old 01-12-2017, 01:13 PM
muddertrucker muddertrucker is offline
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Default Weird jetting!



Here's a pic of the needle.


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Last edited by muddertrucker; 01-12-2017 at 03:08 PM.
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Old 01-12-2017, 03:13 PM
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Is it a 36mm carb? Some 2011 models came with them.
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Old 01-12-2017, 03:39 PM
muddertrucker muddertrucker is offline
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No it's the 38, I was just looking it up to see which one I had.

I have a left over 42 sj from my kdx220 but I'm kinda having a hard time seeing if it's compatible.


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Old 01-12-2017, 04:56 PM
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Perhaps your 145 main has been bored out? If the needle is modified the main could be too.

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