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So, that was the dull bit. I was naughty and removed the return cable and went for a short ride. Fantastic. Handles better than I expected, sounds great. The bike is starting, ticking over, running on all 4. Idle below 1500rpm is lumpy but smooth above that and I sense it wants to pull more at 4-5,000rpm. Pretty sure a carb tune would sort it. However, the rear brake pulses badly. So that's next on the list
I've taken a photo, this is our UK K2 but the routing is the same for the UK K6.
Assuming the carbs are balanced, the low speed setup is essentially the same as your "single Amal" in that the routine for idle mixture adjustment is to wind the screw to give highest rpm, then a bit more to see that cylinder start to falter as it gets too lean, finally back it down (richer) to give 100 rpm drop and that's the set point. You've just got to do that 4 times, one after another to set the low speed mixture as manual describes, they can be different one to another rather than set them all to X turns out . Its all fairly simple in reality.
Quote from: K2-K6 on March 16, 2023, 08:37:56 AMAssuming the carbs are balanced, the low speed setup is essentially the same as your "single Amal" in that the routine for idle mixture adjustment is to wind the screw to give highest rpm, then a bit more to see that cylinder start to falter as it gets too lean, finally back it down (richer) to give 100 rpm drop and that's the set point. You've just got to do that 4 times, one after another to set the low speed mixture as manual describes, they can be different one to another rather than set them all to X turns out . Its all fairly simple in reality. I've only balanced them off the bike. The gent I bought the bike from has given me the 4x vacuum guage kit for 'Dynamic balance'. I have an itch to use it, but it could be a maze I get lost down! All 4 are set at 1 turn out of the pilot screw, so that will need checking when I get it warmed up next. Hopefully it is fairly obvious when one of 3 cylinders starts to falter. I don't follow the 100rpm drop bit in bold? On the Amals it's also an air screw. Bike fully warmed through and I wind in until it falters then back out until stable (revs rise) and leave it there. = the point of richest smooth running.Thanks for your help. Appreciated.