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View Full Version : vader-hellcat-boom 125 pilot jet size?

imapdog
05-08-2018, 03:48 PM
my genuine mikuni vm22-133 came in and has a pilot jet vm22/210 size 30 in it.
isnt this too large for a 125cc and will probably flood, idle extremely high, too rich? what vm22 pilot jet is recommended for a 125cc or what combo is everyone running?

here are my stock genuine mikuni vm22-133 specs:
http://vi.vipr.ebaydesc.com/ws/eBayISAPI.dll?ViewItemDescV4&item=161240922802&t=1518536265000&tid=10&category=177773&seller=niche-cycle&excSoj=1&excTrk=1&lsite=100&ittenable=false&domain=ebay.com&descgauge=1&cspheader=1&oneClk=1&secureDesc=0&oversion=38feea94
humanbeing
05-08-2018, 08:53 PM
from Yamaha YBR125ED service manual
http://s9.postimg.cc/ciac2xnkf/ye2.gif
imapdog
05-09-2018, 08:09 AM
from Yamaha YBR125ED service manual
http://s9.postimg.cc/ciac2xnkf/ye2.gif

thank you humanbeing, :thanks:
#15 pilot is more what i was expecting for 125cc stock bikes with vm22. i will now go with the #17.5 pilot to start with on a new assemble. hopefully my other jets/needles are kosher with a 17.5 pilot to start out with.
imapdog
05-09-2018, 06:49 PM
yeap. #15jet works great. i may just leave it in and not put in the #17.5 being delivered saturday. glad i asked bc starting with the given #30 would have been a chase!