The centering tool in my kit replaces the needle in the piston, and has a
stepped bit which goes right into the jet. Works very well.
Scott
----- Original Message -----
From: "Randall Young" <Ryoung@navcomtech.com>
To: "Triumph List" <triumphs@autox.team.net>
Sent: Friday, November 28, 2003 10:15 PM
Subject: RE: SU H6 Jet Centering
> > What's the best way to center the jet on an SU H6 carb after it's been
> > disassembled?
>
> Don't know that it's "best", but I've always done it by removing the
mixture
> nut and pushing the jet up until it almost touches the piston, then
checking
> for free piston movement as I tighten down the jet nut. Since the needle
is
> tapered, I believe that ensures it cannot touch the jet when the jet is
> lowered to it's normal position.
>
> > Is it possible to accurately center it without a special
> > tool?
>
> I never could do it with the special tool <g>
>
> > Can a good centering be verified by proper motion of the
> > needle/piston?
>
> My concern is that, with the jet in it's normal position, you may not be
> able to detect a slight contact between the needle and jet, but it might
be
> enough to wear them both over time. That would eventually distort the
> mixture profile.
>
> I've never tried it, but I suspect the best "special tool" would be a
steel
> rod that would fit into the needle hole in the piston, and also just clear
> the inside of the jet. The tool packaged in the "SU Tool Kit" only
engages
> the body of the carb, not the piston.
>
> Randall
|