Hi Guys,
I have just put in a new HS4 carby and trialing some new needles. I don't have a colour tune or a dyno in my tool box so I'm just doing this by ear and the colour of the plugs.
The doc's I've read say to lift the piston up 1mm to listen for idle changes but how do I know how much the piston is going up by using the spring loaded lifting pin? I'm pretty sure 1mm of the lifting pin does not equate to 1mm of piston lift.
It seems to work if I just push the lifting pin all the way in to get a result otherwise there is no notable changes?
Is this the correct way?
Thanks Brad