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I am struggling to setup a pair of Dellorto DHLA Emission carbs. Engine is a Vegantune Twincam VTA, 1700cc 8-valve running “sporty†cams. At the moment it starts well (have disconnected the choke arrangement, it doesn't seem to help, just makes a loud whoosing noise when operated) and will idle at around 700rpm when it gets up to about 70/80 deg. The engine will not pull or cruise below 2000rpm and it is running lean throughout the range, plugs are nearly white, very small amount of soot after idling. Vacuum advance is currently connected although have run without some of the time with no obvious difference in performance. It does seem to be relatively happy above 4000rpm, suggesting the progression range is the problem. The consequence of running lean appears to be some overheating, gentle throttle and no static idling for any time is needed to keep temperatue below 100deg C. On acceleration the noise is strangely raucous, hard to describe and not, I think, attributable to the exhaust setup. The carbs setup is: 0 DHLA “H†and “Nâ€, ie the emission carbs. Idle – 62 with the emission holder Main 145 Air Corrector 200 Emulsion 7772.11 Chokes 34 Auxillary Venturi 7848.1 Float level in carbs – as far as I can measure about 28mm from top of tower on engine side. Floats set at 16.5mm. Ideas welcome!
