SOHC.co.uk Forums > CB350/400

Before I took it apart.....

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Nurse Julie:
Quote...

Cor,  you don't arf ask some awkward questions Julie

 ;D ;D ;D
Of course I do Nigel, I'm a Woman, awkward question asking is part of our DNA  ::)

Woodside:
so
are we saying a bench set up set of carbs (correctly)will be closer to optimum set up to a vacuum gauge set up?
or am i reading this wrong...all things being pefect

Woodside:
thinking on this
ill ask you honda trained mechanics this
how much tinkering did you need to do when you pulled these bikes out of the crate...to get them running right..
i guess they were nailed into crates in japan then it was almost anyones guess where they arrived ...there is a big difference between a usa bike set up in alaska to hawaii..
were vacuum gauges involved

K2-K6:
Yes,  exactly that.

I can see the case with original 750 with its 4 separate cables plus equal pipes being a reason to design the guages as a solution, but as it moves to a single bar type carb operation that starts to diminish.

The vacuum guages are not reading anything but that, so if you alter the cylinder vacuum via the pipe on a individual basis, the accuracy of that system falls down.  If vac is too high then you respond by raising the slide,  which reduces resistance, which drops the gauge reading.

So not only is it possible to run the cylinders leaner going across the engine right to left,  number four will be effectively coasting compared to number one as the carb will be more closed.

Nurse Julie:
So Nigel, my question wasn't really awkward in the end but you did answer my question, so thanks  ;D ;D ;D

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