I have recently had my HS4 's refurbished also all new gaskets etc. I have also fitted an electronic distributor which is set at 100 BTDC. My chassis no is FH127081. Engine FMHF. I always used aprox 2 turns or 12 flats as a starting point . the guy who refurbished them has said my carbs are late models and to use 20 flats as the mixture adjustment thread is finer: has anyone heard this? I have had the engine running after warm up and managed to get a tick over about 1000 RPM and set the timing as above . The front carb appeared to be lean and the aft one rich. tried to get them the same: Now It will only start Cold on full choke and runs at about 2500 revs. Using a air volume tester I get the same reading for both carbs: which appear to indicate the that the carbs are balanced. Pushing the choke in just a little the engine stops. Any suggestions please. I have a number of tuning guides including Haynes and following the recommended procedures never before had problems in getting to ticking over smoothly at 800RPM.
Any suggestions
