Topic: bench sync

[extek66]

I finished rebuilding my carbs or should I cleaning and replacing a few parts.Simple Green is the greatest much better than the stuff I used years ago.When I sync the carbs" mechanical sync"how much should the slides be open looking from the back?Its a K1
                                                                             thanks John

[MasterChief750]

use an 1/8 in drill bit itll get it running then sync from there

[Roach Carver]

does not matter within reason (1/8" sounds okay to me). the bit is to make sure all slides are all open the same amount. you will adjust the idle once running and negate the amount (1/8").

[nancy]

I used a piece of 30amp fuse wire.

[Old Scrambler]

I tie thick string to a narrow strip of cardboard...........place the strings under the slides and check to see that all are taught at closed throttle.  Gently pull on the cardboard to tighten the strings, then very slowly open the throttle. When all 4 strings pull out together your carbs are bench-synced.  Its not the amount of space but the opening and closing in sync that matters.

[Kong]

What you are doing is getting all four of them even to start out with, that's why the actual distance doesn't matter.  When I did mine I just used a flashlight.  Hold the light tight against one side, look through the slide, lower it until you see no light, then raise it until the very first crack of light is seen - snug it down and move on to the next one.

[OldSchool_IsCool]

I use a flashlight.

- Pick a reference carb (usually #2)
- place a small flashlight in the intake throat of the reference carb
- turn the idle set screw until the beam of light just disappears from the output throat
- now that #2 is set to "closed", move the flashlight to the next carb intake throat
- use the slider adjusting screw this time to make the beam of light barely disapear again
- repeat on the remaining 2 carbs.

This method not only sets the sliders to the same hights, it also ensures that your sliders are capable of fully closing. 

[camelman]

I like the flashlight method too.  I've done the drill bit sync a few times, but notice that the bottoms of the slides invariably get nicked by the drill bit (yes, I use the round part without the cutting edges when I do it).  If you decide to use the drill bit method, then adjust the slides until the bit can slip underneath easily.  Don't set the slide down on the bit if the slide will contact it with force.

Camelman