A number is stamped on the section of the needle that is inserted into its holder. Loosen the screw holding the needle in extract the needle and read the number on the needle shaft.
You need an SU needle chart to identify the profile or taper of the numbered needle and make comparisons between it and other needle tapers. Thicker needles are leaner running, thinner run richer. The needle chart identifies the needle diameter at standard distances along the needle. There are lots of different needle profiles. Other needles can be both thicker and thinner than your needles at different parts of their profile. Examples: If your engine is leaning out up high, you want needles that are thinner at their ends. If your engine is rich at low revs you want needles that are thicker near their base. Ditto in the mid range. Before you get this far, make sure you have adjusted the base of the needle jet to the correct setting, before making the lean/rich decisions. I think standard setting it is two turns down from flush with the venturie. ----- Original Message ----- From: "Bob" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, 26 August 2002 22:35 PM Subject: SU Needles > Hello membersozdat, > > Now that I have my SUs on, how do I find out what needles are in it, > are they stamped with an ID etc? How do I determine exactly what > type of SU they are eg HIF44 etc? > > -- > Best regards, > Bob mailto:[EMAIL PROTECTED] > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
