chinese mikuni vm22 clones and their pilot jets.....

imapdog · 06-12-2018, 12:05 PM

Q: so why going from #20 to #38 for stock vm22 pilot jets?
A: "mikuni numbers are flow rate, keihin numbers are a hole size".

Q: are the pilot jet 6 holes vs 8 holes a difference?
A: yes, but very small impact in jetting.

i am now understanding the numbers more thanks to mike at jetsrus.
thought i would share this for othe newbies in carbs like myself.
carb jetting is a voodoo i want to learn!

ok, i have been through plenty of these vm22 clones and genuine vm22.
these seem to be very inconsistently stock in the jet styles, even same item from same seller.

the main difference it seems is the pilot jets being totally different in style.
most come with the #38 pilot, and that is a keihin clone pilot jet.
some come with the mikuni #20, and that is a mikuni clone pilot jet.
so, if you don't have the part number or jet size in the sale listing, wait until you have it in hand to verify style of pilot jet.

#1 in the pic is vm22 #20 clone pilot jet ( few this way)
#2 in the pic is vm22 #25 clone pilot jet (very few this way)
#3 in the pic is vm22 #38 clone keihin pilot jet (mostly this way)&(keihin 3j)

Attachment 13359

06-12-2018, 12:05 PM	#1
imapdog Join Date: Feb 2018 Location: nashville Posts: 574	chinese mikuni vm22 clones and their pilot jets..... Q: so why going from #20 to #38 for stock vm22 pilot jets? A: "mikuni numbers are flow rate, keihin numbers are a hole size". Q: are the pilot jet 6 holes vs 8 holes a difference? A: yes, but very small impact in jetting. i am now understanding the numbers more thanks to mike at jetsrus. thought i would share this for othe newbies in carbs like myself. carb jetting is a voodoo i want to learn! ok, i have been through plenty of these vm22 clones and genuine vm22. these seem to be very inconsistently stock in the jet styles, even same item from same seller. the main difference it seems is the pilot jets being totally different in style. most come with the #38 pilot, and that is a keihin clone pilot jet. some come with the mikuni #20, and that is a mikuni clone pilot jet. so, if you don't have the part number or jet size in the sale listing, wait until you have it in hand to verify style of pilot jet. #1 in the pic is vm22 #20 clone pilot jet ( few this way) #2 in the pic is vm22 #25 clone pilot jet (very few this way) #3 in the pic is vm22 #38 clone keihin pilot jet (mostly this way)&(keihin 3j) Attachment 13359 Last edited by imapdog; 02-14-2020 at 08:48 AM.
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