SOHC.co.uk Forums > CB500/550

Stupid question of the day - PD carb balancing

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K2-K6:

--- Quote from: keithtraffic on May 30, 2020, 07:52:40 PM ---Will be interesting to see how you get on with this.

I have just complete re-built my PD46 carbs - new just about everything! They are now back on the bike after a big struggle and  and it seems to run reasonably just after a static balance (setting all the throttle sliders to the same height), but I do want to balance them properly.


--- End quote ---

Strangely enough bench synchronisation and with gauges are the same thing. Gauges just allow you to complete it without dismantling the carbs from the bike.
Parity of carb slides is ultimately for running at equal combustion under full loading as any significant variation will cause unwanted vibrations in that range.
Admittedly it has the byproduct of smoothness,  or improved smoothness, at idle,  but it doesn't have the resolution in mechanical design to fully resolve tickover refinements.  This is completed by adjusting the idle circuits for each cylinder to produce parity of combustion at this speed range,  which do have the resolution to control it. They are in effect individual throttles with micro adjustment.

keithtraffic:
So, does that mean that if they have been statically balanced its no necessary to use the vacuum gauges for anything?

SPR:

--- Quote from: keithtraffic on May 30, 2020, 10:46:19 PM ---So, does that mean that if they have been statically balanced its no necessary to use the vacuum gauges for anything?

--- End quote ---

I suspect the skill used when static balancing plays a big part - mine looked OK when I had them off but the gauge showed that they were way out

Nurse Julie:

--- Quote from: SPR on May 30, 2020, 10:56:05 PM ---
--- Quote from: keithtraffic on May 30, 2020, 10:46:19 PM ---So, does that mean that if they have been statically balanced its no necessary to use the vacuum gauges for anything?

--- End quote ---

I suspect the skill used when static balancing plays a big part - mine looked OK when I had them off but the gauge showed that they were way out

--- End quote ---
I think if you have access to a decent set of vac gauges, it's worth checking your bench sync if you want to double check the result. We never vac gauge after bench syncing, our bench syncing is so close but, it's takes experience to get it spot on.

K2-K6:
http://www.sohc.co.uk/index.php/topic,17769.0.html

Above link is a very elegant way of working through a set while on the bench.

Obviously it will give greater accuracy than just doing it by eye.

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