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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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Thread Tools | Display Modes |
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Basic Carb Function explanation
I found this link while trying to educate myself in understanding the way the carb works. Pretty good reading and helped me understand the way the carb circuits work (it has pictures!)
http://www.motorcyclecarbs.com/carbs101.pdf
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Current: 2014 Gas Gas EC300R _____________________________________________ Previous: 2011 Gas Gas EC300 ELC 2004 KTM 300 EXC |
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In case the link is ever removed
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Nice article. Printed that out for my service book.
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A Few Jetting Basics (ie Jetting 101)
At the suggestion of Jakobi, I compiled a few posts into this thread to help folks out there like myself - somewhere between grasping at straws to a somewhat fundamental understanding of how the slide, pilot jet, needle, main jet, and air screw all work together.
Props go to stainlesscycle and arminhammer for the content below; my guess is others will hopefully add to this. The simple explanation and then how to adjust is by far the biggest help for me. Now if I could get the secret needle code decoder ring, I might actually be able to comment intelligently...lol. Quote:
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Adding the information from arminhammer...and someone named Spanky
Quote:
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#7
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I've also merged it with a previous Sticky on the same topic as I know Jeff (webmaster) would rather keep them to a minimum. Give me a few days and I'll try and gather my notes on part numbers, needle codes, diameters etc.
One thing I will note straight up though (which is also in spankys guide). You will NOT jet out a mechanical issue. First point of call! If you're not sure, take the time to check or you could be wasting your time going around in circles. That also includes the carb! Make sure its clean and that the floats are in spec. |
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Quote:
I'll be referring to this thread this coming weekend as I try to get both my brother-in-law's 250 and my wife's 200 setup and ready for our first outing the last weekend of May |
#9
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Before you play too much try and bring the idle down nice and low with the idle screw, and then adjust the air screw. I'd suggest 1.5 turns from fully seated, but you may come out further. If it idles up when you open the air screw you can bring the idle back down again with the idle screw. When its on the money it'll tick over like a sewing machine, and the air screw will be quite effective where opening it up causes a lean condition and going rich makes it want to flame out a bit.
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