Make sure that the shoulder on the needle is level with the bottom surface
of the piston - if it is below the surface, you will always run too rich.
Also, make sure that the jet is truly centered. With the spring removed
from above the piston, the piston should drop under gravity and you should
hear a "clunk" when it hits bottom. If it doesn't do thius, the jet is not
centered and you will run rich.
-----Original Message-----
From: Michael Ferguson <fergie@ntplx.net>
To: triumphs@autox.team.net <triumphs@autox.team.net>
Date: Saturday, June 19, 1999 2:49 PM
Subject: SU Carbs
>
>TR3 was running VERY rich. Tried adjusting jet adjusting screw, but jet
>collar was turning with it. Turned out the locking nut was loose. Removed
>carbs from engine, re-centered, tightened locking nut, reassembled and
>installed. Pistons move freely.
>
>Opened both jets by 15 flats, set throttle stop per instructions in every
>manual I own (barely holds a piece of paper). Started engine, let it warm
>up...and CANNOT make it run properly!! I get black exhaust and a VERY rough
>idle at about 1000-1200RPM - any lower and it stalls. Black exhaust says
too
>rich so closed jets one flat at a time. No improvement, still black
exhaust,
>rough running. Kept tightening jet until all the way in! NO CHANGE.
>
>No matter where I have things set, lifting piston by 1/32" increases idle
>slightly. And the thing STILL runs like a tank.
>
>Am I doing something wrong or are my carbs in need of major surgery? Thanks
>for your help.
|