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

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Old 09-10-2018, 04:57 PM
Alberto17 Alberto17 is offline
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Thanks! appreciate all the information provided here!

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Old 09-10-2018, 05:24 PM
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john r b john r b is offline
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Originally Posted by Alberto17 View Post
What is the difference between those 2 in terms of bike performance?

I am afraid I bought a cheap one(china) and that is why it does not work good
You receive what you paid for..
'12 XC 200 TTX Sold
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Old 09-12-2018, 12:22 AM
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Jim Cook Jim Cook is offline
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Originally Posted by Davehuge View Post
There's no difference in performance between the AS1 and AS2, both will work great on your bike...

BUT it's essential to get your carb setup correctly, or it won't run correctly or may not even start at all!

Start with the basics, clean air filter, good spark plug correctly gapped, new fuel with good quality 2 stroke oil (usually 2% for full synthetic but check). Check rubber tube between carb and reed block, on older bikes the rubber can perish and split causing an air leak, it's not expensive to replace.

Then check carb, remove main jet and pilot jet, inspect/clean. The hole in the pilot jet is very small and can easily be blocked.

Remove float and float valve, clean/inspect. Rubber tip on float valve can look OK but on older bikes the rubber can harden and it doesn't seal so well.

Check float height, very important before you start adjusting jetting.

Once you've completed all the above start trying different jets. You said it ran good with your friends carb, try copying his jetting, it might not be perfect but should give you a good starting point.

Main things to concentrate on are... Main Jet, Pilot Jet, Needle and clip position, Air Screw.

Good luck, stick with it. Once you get it jetted correctly it'll be a great ride!
In addition to all the good advice Dave gave you, I feel it is best to have a freshly packed silencer when "critically" jetting a carb. This will remove one uncertainty in your equation.
Jim Cook
Smackover Racing
'11 Gas Gas EC250 (primary ride)
'06 Gas Gas DE300
'94 Husaberg FE350
'86 Yamaha IT200 AHRMA CC Race bike
Several others, including project bikes, Deb's bike, and a fleet of grandkids' bikes

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Old 09-12-2018, 03:56 AM
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SS109 SS109 is offline
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The Chinese knock offs just aren't worth it IMO. Their jets are not genuine so their numbering system, if they're even marked, won't match with Keihin jets so jetting them is a pain. Also, one that most seem to overlook whether genuine or not, you need to have the right number slide in there as well.

You can buy a real deal Keihin through Sudco, Jet-r-us, or a nicely modified version from RB Designs (Ron Black).
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