pilot air screw adjustment-please explain!
Posted August 11, 2002 - 01:26 AM
My question is, How do you adjust the pilot air screw to represent pilot air jet size?
How many turns from fully seated does it take to get a 60 paj size? for example, and what size Piot Air Jet is best matched to the 38 Pilot jet.
Any advice from anyone running the smaller'taffy' style of jets or the adjustable Pilot Air Screw will me much appreciated, taffy? jd? anyone! anyone!
I intend to go to yz timing as well soon, will my intended jets be in the ballpark for that change or doesn't the yz timing make much difference to jetting requirements?
thanks in advance for any help!
Posted August 11, 2002 - 11:36 AM
A 38 pilot jet equals a 60 paj.
Posted August 11, 2002 - 05:32 PM
With a #38 pilot jet you should be down in the range of 3/8 to 1/2 turns out on the air screw from lightly seated to get a #55 to #65 pilot air jet. Taffy makes most of his posts assuming you have this chart to see how many turns he's recommending on the air screw.
A #38 pilot jet with #60 pilot air jet sounds like a good plan to try.
Posted August 12, 2002 - 12:37 PM
Posted August 14, 2002 - 12:53 PM
Keep in mind i do not have a yz426 but it is an fcr carb which may or may not work. Anyway to set that slow air screw i take off the rear of the bike to allow access to the intake of the carb. I then start it, let it warm up and adjust the idle speed up to 1800rpm's or so.Then i turn that screw out until i get the highest idle speed.It's important to stop there because turning it out further will just lean the mixture with no noticeable effect on the idle.
I have had very good results with this method and have read on other message boards of others doing the same.