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Old 05-26-2016, 09:33 AM   #1
Track_Graphics
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CAN YOU USE A VAC GAUGE ON A BIKE THE SAME WAY YOU DO ON A CAR?

Just wondering.
All the videos about using a vac gauge always show the guys blipping the throttle. What happens to the vacuum if you just hold the engine at like 2500 RPMs?
I would assume different values on a bike, but is it in effect the same idea?

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Old 05-26-2016, 09:45 AM   #2
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Yes you can use one 'for a car'.

Hook one up to find out the results.

Then test a car and see if its the same or different.
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Old 05-26-2016, 10:04 AM   #3
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Guess I should clarify:
Can you use a vac gauge to diagnose conditions of a bike the same way you would use one on a car like in the video? i.e. If the needle drops and stays down it means one thing or if it vacillates b/w 15 and 20 in.Hg it means something else, etc...
Are there already published readings for what bikes should be (I suppose, depending on the bike, they would each be different)
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Old 05-26-2016, 10:16 AM   #4
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Considering the vacuum is the same as a car, yes. As far as the published readings, google might tell you if you ask nicely
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Old 05-26-2016, 10:25 AM   #5
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Quote:
Originally Posted by Track_Graphics View Post
Guess I should clarify:
Can you use a vac gauge to diagnose conditions of a bike the same way you would use one on a car like in the video? i.e. If the needle drops and stays down it means one thing or if it vacillates b/w 15 and 20 in.Hg it means something else, etc...
Are there already published readings for what bikes should be (I suppose, depending on the bike, they would each be different)
All the same principles apply. The nice thing about a bike is you can get individual cylinder readings as opposed to a car, where you get overall vac readings.

For quick diag, its just like a compression test; if all the other cyls are x amount, and one isn't close to the others, you have a problem on that one cyl.
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Old 05-26-2016, 10:31 AM   #6
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I'm going to pick up a gauge. If I hold the engine at 2500 RPMs will the vacuum stay low or will it eventually go back to the reading at idle?
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Old 05-26-2016, 12:28 PM   #7
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It will initially drop off, then hold steady, just like at idle.

If you are on the 290 side, you can borrow mine, or my CarbTune if you want.
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Old 05-26-2016, 01:50 PM   #8
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I live in La Marque. Right now I'm in Milwaukee doing some stuff for HD, but hope to be home in a couple months. I'm doing all my research while I'm up here and when I get back I'm going to do the work.
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Old 05-26-2016, 03:05 PM   #9
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Quote:
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I live in La Marque. Right now I'm in Milwaukee doing some stuff for HD, but hope to be home in a couple months. I'm doing all my research while I'm up here and when I get back I'm going to do the work.
Not sure what you are looking to diagnose.

If you are doing carb issues, yeah a vac gauge is good, but a thermo gun can tell much more.

Whats yer issue Pirate?
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