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June 19, 2004
Jens,
Fixed needles are held rigidly by a grub screw into the piston, but
swinging (or biased spring) needles are retained by a separate collar, they
are forced by a light spring so that they contact one side of the jet, so
no centering is needed, but the jet and needle both wear more than the
fixed type. They're not interchangeable because of the retaining ring on
the spring type. HS2s used both types, depending on the year. You can check
which yours is by the tag number on the carb float bowl (what do you mean,
it's not there?!) or taking the dashpot off and looking/checking if the
needle wiggles!
There should be a (broadly) equivalent needle available in both fixed and
swinging types. (I would tell you if AAV is the same as No. 5 but I lent my
SU book to someone and never got it back :-( )
Regards
David
"David Jacobs" < mail@... > 32690
Posted on June 19, 2004 11:15 PM
Posted to category(s) Carburetor | Engine (internal) | Exterior | Suspension & Steering | Technical Info | Tuning
