running rough

thanks for that, i have tried swapping the pistons over and tried the old springs, all with no change , i think the needles are ok as with the domes off i can gently move the piston up and down and the needle slides up and down the jet smoothly, still think there is too much pressure/ suction between piston and dome

regards Steve.
 
AC Dodd, Living with a Classic and D3Shooter channels on Youtube (and more). Detailed examinations and rebuilds of SU's, tuning, and the correct oil to use.
 
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