06-12-2018, 12:05 PM | #1 |
Join Date: Feb 2018
Location: nashville
Posts: 574
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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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06-12-2018, 04:03 PM | #3 | |
Join Date: Feb 2018
Location: nashville
Posts: 574
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Quote:
"THIS" is over twice the cost of most....its not a problem with the cheaper ones, if you want to wait till it arrives to make sure of pilot style, even if its same item from same ebayer. tbolt prob is ok to get consistency. if not, then its all over the place re-learning these carbs if running different styles....messed up you cant predict what u get..... i guess its tbolt next time.....unless someone can lead me to the next vm22 clone specified-pilot carb for less. Last edited by imapdog; 06-12-2018 at 05:28 PM. |
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06-12-2018, 11:45 PM | #4 |
Join Date: Aug 2017
Location: Bay Area, CA
Posts: 375
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This is the carb that I bought for my 2017 Apollo DB-X18 I have it jetted with a 20 pilot, & 112.5 main at sea level.
https://www.amazon.com/MIKUNI-VM22-C.../dp/B0176TACDC The pilot jet in mine is the same as picture # 1 |
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06-13-2018, 11:08 AM | #5 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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FWIW, Mikuni uses hole size for jet numbers. IOW, a 100 jet is 1.00mm, a 110 jet is 1.1mm, etc.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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07-31-2019, 12:44 PM | #6 |
Join Date: Sep 2016
Posts: 103
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Reviving an old thread,
So if I get one of these VM22 clones that comes the #38 clone keihin pilot jet what size jets as a base for tuning should I get for a 120cc? (fake 124cc). Everything I read suggests a 17.5 pilot but I'm guessing that is a true Mikuni jet size. Same with main jet, recommended seems to be 100~105, again is that Mikuni sizes and if so what are the equivalent clone keihin jets? |
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07-31-2019, 12:56 PM | #7 | |
Join Date: Feb 2018
Location: nashville
Posts: 574
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