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1978 CB550 K3 "running" restoration
SPR:
Another day another go !!
The aux tank arrived so connected everything up again with the tank in place to give me longer to get the carbs balanced
I just can't believe how fiddly these are to get close ... add to that an idle screw that is so sensitive .... I struggled to be honest
Eventually I think I've got them pretty much within one mark of each other on the gauge and idling at 1100 rpm
Are the earlier carbs this bad - or is that why people tend to change them ?
Cheers
Simon
K2-K6:
To clarify sequencing, vacuum balance to within 1.6 inch Hg ( 40 mm) then leave the vacuum adjustment alone. In other words slides are in spec of Honda manual.
Then use the idle screws to refine the combustion of each cylinder at tickover, you don't need the gauges fitted for this but use rev counter to observe the effects each cylinder has.
Do you want a photo of Honda manual that describes this element?
SPR:
--- Quote from: K2-K6 on May 31, 2020, 05:01:00 PM ---To clarify sequencing, vacuum balance to within 1.6 inch Hg ( 40 mm) then leave the vacuum adjustment alone. In other words slides are in spec of Honda manual.
Then use the idle screws to refine the combustion of each cylinder at tickover, you don't need the gauges fitted for this but use rev counter to observe the effects each cylinder has.
Do you want a photo of Honda manual that describes this element?
--- End quote ---
I've only one large idle screw ... are you referring to what I call the mixture screw ? I've been tweaking these slightly to get the best overall running
Bryanj:
The mixture screws stick downwards at manifold side of carb and have a spring , tiny washer and tiny O ring on them. All those little bits are needed and must not be doubled up
K2-K6:
Yes, talking at crossed subject there.
The big, single screw that sets the engine's speed at tick over and lifts all carbs together is not the one I mean for idle mixture adjustment.
The mixture screws are the ones in the routine, after getting slides to parity with vac gauges, these refine each cylinder to effectively get each one running with the same combustion energy to smooth out crank speed fluctuations. This to make them run like a swiss watch.
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