RTC wrote on 08/14/10 at 11:06:38:LANCER wrote on 08/14/10 at 02:10:39:RTC wrote on 08/13/10 at 16:37:42:has anyone ever drilled thier own bleed holes? I was thinking about doing this to my 52.5 pilot. I can only find 55 with bleed holes here in town and that has been way too rich for me. Any experience in this matter?
keep in mind that "bleed holes" do not increase fuel flow, they only help to smooth out the transition process when going from low throttle to midrange throttle positions
i have heard that the bleed holes only smooth out the transition but why is a 55 w/bleed holes way too rich and a 52.5 way too lean? where is the in between? it seems that if there is more than one hole in the jet, then more fuel would be going through it.
Mikuni makes 3 different types of pilot jets for the various types of carb models that will fit (thread size wise) in the stock BS40 carburetor.
If you happen to get pilot jets that are of different types they will flow much differently.
The
VM22/210 series is for the VM & TM carburetors.
The
BS30/96 is the correct bleed type and the
N151.067 is the correct non-bleed type for the BS40 carburetor.
It is easy to get them mixed up since they look virtually alike to the eye.
Keep in mind that the main hole in the base of the jet (the threaded end of it) is what controls the amount of fuel flow; and the bleed holes are down stream of that...so the bleed holes have no control of the volume of fuel flow, only how it is dispersed
after it comes in through the main hole.