SOHC.co.uk Forums > CB350/400
400/4 carb balancing
flatfour:
Perhaps it's just the luck of the draw - my Davida set of gauges are over 20 years old now, used a couple of times each year and have been faultless.
4wDaz:
Anyone used the Morgan Carbtune ?
taysidedragon:
--- Quote from: 4wDaz on May 23, 2020, 09:49:56 AM ---Anyone used the Morgan Carbtune ?
--- End quote ---
Yep. Easy to use and good quality. My local club has a tool loan scheme so I just borrow it when I need it.
If I used it more I would buy one.
4wDaz:
I think i may have to invest in a set :)
Oggers:
You don't "need" any fancy stuff. I used 4 milk bottles - 1/3 full of water and red food colouring, 4 rubber bungs drilled to take the tubing, clear PVC fish tank tubing, and 4 x 5mm? adaptaors to take the hoses from each manifold. Cost about a tenner. The set up is a very cheap but effective manometer - details on You Tube plus many others. The goal is to ensure each carb pulls the same vacuum- doesn't matter what it actually is - and that the water level in the bottles ends up the same - or pretty close!. Fiddle with the carb screws and lock off until it is.
Arguably it is more accurate than cheap gauges as there is no calibration to worry about. My tickover is now pretty well sorted. Very little horrible primary chain rattle, good pick up, and very smooth throughout the revs.
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