Vacuum imbalance above idle - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 
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post #1 of 3 (permalink) Old 06-01-2012, 12:00 PM Thread Starter
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Vacuum imbalance above idle

30 years ago when I wrenched on bikes for a living I used a mercury manometer and it was common practice to sync your carbs somewhere above idle... 1500-2000 rpm. Thinking was.. that was where your motor ran most of the time. On my Vstar 1100 the vacuum becomes awful imbalanced above idle with the front cylinder drawing a lot more vacuum than the rear. I don't remember seeing this way back when. Might be because the mercury, being so heavy, wasn't as sensitive and didn't show the imbalance as much as other fluids. Has anyone else experienced this? I'm using the 2 bottle method with water. Worked way better than my home made u-guage manometer.
http://faq.ninja250.org/wiki/How_do_...arb_sync_tools
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post #2 of 3 (permalink) Old 06-02-2012, 10:46 PM
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Originally Posted by Reno View Post
30 years ago when I wrenched on bikes for a living I used a mercury manometer and it was common practice to sync your carbs somewhere above idle... 1500-2000 rpm. Thinking was.. that was where your motor ran most of the time. On my Vstar 1100 the vacuum becomes awful imbalanced above idle with the front cylinder drawing a lot more vacuum than the rear. I don't remember seeing this way back when. Might be because the mercury, being so heavy, wasn't as sensitive and didn't show the imbalance as much as other fluids. Has anyone else experienced this? I'm using the 2 bottle method with water. Worked way better than my home made u-guage manometer.
http://faq.ninja250.org/wiki/How_do_...arb_sync_tools
It just needs to be balanced at idle...950-1000 RPM.

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post #3 of 3 (permalink) Old 06-04-2012, 06:35 PM Thread Starter
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Originally Posted by Sick Mick View Post
It just needs to be balanced at idle...950-1000 RPM.
Mick,
Why is idle better than closer to where the motor will be running?
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