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SU carb tuning guide L16, L18

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#21 noramost


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Posted 07 April 2018 - 05:47 AM

After I balance and sync I raise the idle enough to keep it running and pinch off a fuel tube from bowel to nozzle one at a time with a hemostat and set the CO to 1.5 using my Sun 5 gas exhaust analyzer then the other. For some reason 1.5 + 1.5 = 4.5 when you take off the hemostat and back the idle back down to 800 so now that my CO is balanced I just lean the nozzles out the same about ½ turn. The trick is to lean them out until the HC just starts to go up then back of until it drops back to its lowest point. I usually end up with a 3.5 CO and a 400 HC depending on how warn out the throttle shafts are which equals around 28MPG

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