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ady witting

2016 Sherco 300 Carb Jets

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Does anyone know what jets I should be running on my carb its a kelhin flat slide

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What do you have it in now and how is your plug looking?

Altitude? air temperature? high performance or just farting around?

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I'm experimenting with mine at the moment. I've just popped a 48 pilot in on reccomendation of one of the MRS British riders and have been advised to run the air screw 1/2 to 1 full turn out. I'm going to try this first and i'm hoping it will be spot on. 

 

Chris @ splatshop has suggested the following:

 

48 pilot

128 main

3 1/2 slide

raise the needle one clip

 

Obviously the slide is quite expensive so he suggested a richer needle if i didn't want to spend the extra on the slide. 

 

 

 

 

 

 

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That setup should work, It will be on the rich side but will help with detonation.

 

I have just set up a 14 factory with a 48 pilot, 128 main and the std 4 slide with a jjh needle clip in middle, Its had some ignition and compression mods and it runs very smooth with no detonation, A tad rich off the bottom but it's being ridden by a novice so it will stay that way till he improves.

 

You could go to a 45 pilot with the 4 slide and change to a jfh neddle, This is more cost effective than buying a slide.

 

If you want an aggressive setup 3.5 slide JJH needle, 125 main and a 45 to 48 pilot, Needle 2nd from bottom.

 

With a 48 pilot the air screw will be 1.5 to 2 turns.

 

What symptoms are you getting? If it's a new Sherco I would imagine it has an air leak as the stupid plastic manifold is a piece of junk, Sherco are aware of it and just supply a foam gasket to help it seal.

 

You will have to order a box of manifolds at 50 quid each to find an almost good one!

 

Speak nicely to Chris at splatshop and he will try to find you the straightest one possible.

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The standard out of the crate jetting has a 45 pilot and 3 slide. The bike runs a little weak hence making it a tad richer.

 

The new airbox makes has made a lot of difference in how the engine runs. To the extent that Chris @ splatshop thought he had an air leak on his new bike as it was running so weak but in fact it was just jetting. He suggested he may go a little richer still! 

 

Edited by hugh_b

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am I missing something here but surely you shouldn't have to start spending money on jets and slides etc having just forked out 5k on a new bike my sherco is nearly 13 yrs old been mine from new and never been altered and is spot on

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am I missing something here but surely you shouldn't have to start spending money on jets and slides etc having just forked out 5k on a new bike my sherco is nearly 13 yrs old been mine from new and never been altered and is spot on

 

Funny that as I always changed the pilot jets on my 03 04 and 05 sherco. Perhaps yours isnt as good as you think.

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I've just changed my carb settings now, left the pilot jet at 45, changed the main jet from a 125 to a 128 and needle setting to 1 up from bottom, going to try this setting at trial on Sunday (Lincoln). hopefully this setting should be ok.

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