Joined: Aug 2009
Location: Sunshine Coast, Queensland, Australia
I used to have a 1970 Datsun 1600 510 with the twin Hitachi SU type carbs. Most problems are with vacuum leaks or sticking floats. They can be balanced by ear listening to the noise of the air being taken in. Set carb by turning the jet adjusting nuts under the base of the carb.usually the nuts only need turning 1/2 turn either way. You check the mixture adjustment by lifting the piston approx .8mm and if idle increases it is too rich, fix by turning jet nut clockwise. If it decreases when piston held up turn anticlockwise to increase richness. do left then right carby from front.the mixture is right when the engine speed rises slightly when the piston is raised slightly above the .8mm checking height. Hope this is of some help. you really need the manual to go through it step by step.
Aussie 1986 N12 PULSAR 24 years,250000km one owner, still going strong!
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