Q:stock jet is 122 kn power kit tells me to put in a 114, im running stock ehx. with air lid on. going down in size does not seem right to me.im also running a kn filter. any advise?

 

With the K&N kit their jetting #s are different than stock. If you were using stock main jet I would go up to the next size #124 or #126. I use a K&N with a DG pipe and I use a 130. I suppose you could compare the jet sizes physically. The hole in the center of the K&N #114 should be slightly larger than the hole in the center of your stock #122. Jetting these carbs is a real treat! Just getting the carb out takes a little practice.

 

Don't listen to the last guy he can't even get the sizes right. 124 and 126 aren't even jet sizes, get yourself a 125 main and you will be good.

 

He is right, the K&N jet kit uses their own jet numbers.

 

WRONG!!

ordered directly through Keihin, you can in fact get hex main jets in: ..123,124,125,126,127.......

motorcycle shops only carry incraments of 5, because "you don't need in between sizes"
you can't even get the stock 122 at a honda dealer; "use a 125, it's the same thing"

call the manufacturer, you'll be surprised what they offer
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I infact have gotten a 122 main from my honda dealer and jets aren't in 5's either through them. 122,125,128,130,132 etc.,etc.the same as every catalog and dealer that i've called. From east to west coast.

 

Hey guys listen to this, this seemed weird to me to. I jetted mine the other day with a K&N Stage II kit. I had to go down to a 120 main. It gave it more power, even though it was a leaner jet. I also installed the K&N Needle on the fourth notch.

 

I got a HMF S/O K&N airfilter and getting 3 hmf kethin jets 120 125 and 130 what size should i use for my 300ex

 

i have a hmf s/o and k&n airfilter should i use a kethin 125 jet?