Topic: carb synchronizer how to

[Deltarider]

Skip the vacuum tools.
Bench sync work good enough.
Setting the ignition correct will make big difference.

I share Pewe's experience. Realise that the vacuum meter set is ment to save on labour time in the workshops. The three times I have bench synced my carbs, I managed - when tested afterwards - to have all four within 2cm Hg of eachother, which is well within Honda specs. Bench syncing has to be done in the right mood and well concentrated though. Don't hurry, take your time. Some use drill bits. I used a small allen key under the slides engine side. Some do it using steel balls; goal is to have them drop simultaneously. Would be interesting to know how carbs were bench synced in the factory.

[rotortiller]

The nice thing about the gauges is they can be exactly matched before you use them with the calibration screw and matched at operating vacuum. Doesn't get any better than that. Furthermore static bench syncing is like static timing, it gets you in the ball park however the gauges take into account other factors like minute differences in cylinder draw, carb inlet tolerances etc. If you suspect the gauges are out swap lines and verify indications. Some guys will swear that using a light bulb is better than a timing strobe. Specialty tools are normally appreciated by professionals, even those brought up as shade tree mechanics. The bottom line, syncing with gauges require very tiny adjustments, even the torque down on an adjuster lock nut will affect the readings, try that with drill bits and feeler gauges.

[PeWe]

I used drills I had and use when drilling, not a cent or penny extra spent

Saving money is the deal here, better to spend those on parts as TS want.

Yes, vacuum tool will make it a little bit better, but my adjustments were always good enough like Deltarider also have experienced.

If vaccum gauges make a huge difference compared with a careful bench sync, it must be differences in valve lash, opening/ closing, leakage etc that should be addressed.

There are several descriptions how to do.
Drill on engine side. Do not let the throttle spring to snap throttles on the drill this will cause marks.
I have used 3-5mm drills. Make sure throttles are not adjusted very wrong. Let carb 2 be a reference.

Hondachopper.com has a good description as for carb floats, ignition etc.

http://www.hondachopper.com/garage/carb_info/bench_sync/bench_sync.html

If I'll synch my Mikuni TMR again I'll use my Morgan carbtune

My K2 with stock carbs are OK as they are.
Maybe try the Morgan . I have found my old home made 2" long copper tubes I screwed into each carb and connected hoses to. I do not recall which tool I used back then, early 80's when clocks were a luxary tool.