> 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
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