SOHC.co.uk Forums > CB350/400

Carb Synchronising with a gauge.

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Rayzerman:
Alternate method, test each gauge with a hand vacuum pump that has a gauge, note the offsets...... or,  join all 4 gauges together and use the vacuum pump (or I suppose connect to one cylinder, and note the offsets.

scifi:
Thanks for all the replies.  My CB250 has rubber manifolds without the access screw holes, so my gauges won't work on that machine.   For the 400-4 I am following the O ring discussion, it is much like the main jet O ring on Mikuni carbs, that I have on my Yamaha ty175 ( think that needs 4.6 x 1.6 mm.)

btw,  Our local Aero Club had an Altimeter Calibration Manometer, that could be used to test airplanes altimeters.  We just needed to connect all the pipes together with Tee Pieces.

kevski:
Ideally with clean and serviced carbs, running stock jetting and filters, you need to bench synchronise the butterfly's or slides first, then run the bike up to temperature  synchronise at around 4k rpm using the synchronising screws between carbs,  then on idle using the pilot circuit fuel or air screw, whichever is applicable.
But if your bike is running fine don't touch it, also don't just warm it up in the garage all the time as this will leave the plugs black and make them hard to start and miss on cylinders.

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