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Author Topic: Bench sync...... Using a vacuum cleaner  (Read 3325 times)

Offline Homesick vagrant

  • Posts: 41
Bench sync...... Using a vacuum cleaner
« on: May 21, 2014, 01:14:13 »
I got bored. So I went to the garage.


Re: Bench sync...... Using a vacuum cleaner
« Reply #1 on: May 21, 2014, 14:46:27 »
Looks like Ichiban has some competition!
"Remember when Goldwings were sexy? Me neither" -- Comet Tavern bathroom, Seattle.


Offline cqyqte

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Re: Bench sync...... Using a vacuum cleaner
« Reply #3 on: May 21, 2014, 16:09:52 »
It works just great until you forget or get lazy and leave some fuel in the float bowls... but that would be okay if your name was Wile E Coyote!  Remember gas fumes are way more combustible then liquid and vacuum motors have brushes that spark when the motor runs!!!!   :o
'71 CB450K4 (BlackJack) Sold
'83 GS450GA (Automatic) Sold
'75 CB750F Hardtail (Deviant, 2010 Class Winner)
'02 XV1600 Roadie (the Stooge) Sold
'01 XV1600 RoadStar Custom Bagger
'01 VT750DC Sold

Offline Homesick vagrant

  • Posts: 41
Re: Bench sync...... Using a vacuum cleaner
« Reply #4 on: May 21, 2014, 19:46:22 »




Offline Bootsey

  • Posts: 247
Re: Bench sync...... Using a vacuum cleaner
« Reply #5 on: May 21, 2014, 20:58:47 »
Are the carbs back on the bike? Would love to know how well synched they are from this method, when you get them back on.

Offline irk miller

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Re: Bench sync...... Using a vacuum cleaner
« Reply #6 on: May 21, 2014, 21:03:04 »
Are the carbs back on the bike? Would love to know how well synched they are from this method, when you get them back on.
  Obviously, this was staged because gas explodes in a vacuum just like in space.

Offline Homesick vagrant

  • Posts: 41
Re: Bench sync...... Using a vacuum cleaner
« Reply #7 on: May 21, 2014, 22:03:09 »
It's not a substitution for an actual sync on a running motor. I'd venture to say, it's another option, and maybe better than a feeler guage or eyeballing it.

I'll check it at some point. Valves are in spec, carbs are clean, main jet is too small. It idles great. low throttle steady state hunt and surging is gone, but it's lean up top. Main jets will be here tomorrow.

I'd venture to say, it's closer than bench syncing with a feeler guage or eyeballing it. As well as it's doing right now sync is lower on the list than getting WFO throttle working right first.

Offline Homesick vagrant

  • Posts: 41
Re: Bench sync...... Using a vacuum cleaner
« Reply #8 on: May 21, 2014, 22:12:50 »
I almost spilled my beer on my cigarette while I was draining the gas out of the carbs because I burned myself on one of the candles.


Offline Rich Ard

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Re: Bench sync...... Using a vacuum cleaner
« Reply #9 on: May 22, 2014, 00:03:44 »
I thought it was pretty clever, in a Rube Goldberg kind of way.
unplug the connectors from the harness and multimeter the shit out of them

Bad Points, a comic :: CB450 Restomod (sold) :: Viragostrosity :: GL1000 daily rider :: Kaw 175


Offline Homesick vagrant

  • Posts: 41
Re: Bench sync...... Using a vacuum cleaner
« Reply #11 on: May 23, 2014, 23:03:04 »
Curious to see if it'll pick up variances between jets. Testing the jets out of the carbs. But, I'm pretty sure the vacuum cleaner won't pull enough. Not for flow but consistency. If it will, you can put the richer jets in the middle cylinders (to keep them cooler).