Vacuum Sync Help Request - Kawasaki Versys Forum
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post #1 of 4 (permalink) Old 09-09-2012, 03:57 PM Thread Starter
twowheels's Avatar
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Vacuum Sync Help Request

I just got my carb sync tool connected when I got rained out and had to cover the bike. I'm in rain delay mode right now.

The vacuum was a little off but not by much at 20,000 km/12,000 miles.

I've read through the sync procedure in the service manual but could not locate the adjustment screws. The manual states I need a special tool to adjust these, is this true? Any help or pictures would be greatly appreciated.

Also as I interpret the manual, if the balance is off, booth screws should be turned full clockwise, then the screw with the higher vacuum should be backed off until balance is reached, is this correct?
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post #2 of 4 (permalink) Old 09-09-2012, 09:35 PM
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If you don't want to take the tank and airbox off, then I think you likely do need the special tool.

When I did mine at about 8k miles, they were way off. I turned one screw (right side) about a quarter turn, retested, another smaller turn, retested and it was spot on. I don't see any reason to fully close both and start over, though there might be something I'm missing. The end-results were really impressive; this was the best 30 minutes of work I've done on the bike. (the tank was already off to clean the air filter, which barely needed it).

Cheers, Jeff

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post #3 of 4 (permalink) Old 09-09-2012, 10:15 PM
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Leave the closed screw as it is, and balance both at 1300 rpm idle by adjusting the screw that is aready open. Yes, opening it more lowers its vacuum reading... You can run it without the airbox but with inlet air temperature sensor still connected and unscrewed from airbox, by propping rear of fuel tank up a few inches to access TB vacuum bypass screw. I covered the TB inlets with original air filter element, but you can use a single layer of lint-free cotton fabric... Easily accessible with airbox removed, here's the left throttle body's vacuum bypass adjustment screw at the end of red pointer, as seen from fuel tank's rear mount:

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post #4 of 4 (permalink) Old 09-10-2012, 05:10 AM
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That's how I did mine too, with the airbox removed. I put it on a sawhorse next to the bike and left the sensor wire connected. Then had to reconnect the tank. With the airbox out of the way you can reach the screws fairly easily. I only needed to turn out one of the screws (the rights side one, I think), to get the balance good. I think you're supposed to check balance at idle and also at 4k rpms, but I could be wrong about that.
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