how can I check for vacuum leaks on my bike

Ayman L · 11-05-2008, 12:14 PM

(honda vtx)? after rejetting my honda vtx, it now chokes when I turn on the throttle. I checked air-fuel mixture, and checked all hoses, all seems good. I was told I might be having a vacuum leak. anyones knows how to check for that.

broken_pole_texas · 11-06-2008, 04:04 PM

Drive it underwater and look for bubbles.

PsychProf · 11-08-2008, 12:53 PM

Start the honda. Find or buy a 3' length of new fuel hose. Stick one end in your ear and snoop around the intake system with the other end listen for any pronounced "hisssssssing...". [Warren Bain] I was able to isolate a vacuum leak with a mechanic's stethoscope with the probe removed and only using the tubing to get very close to the gasket and follow the contour of the manifold. You can also modify the stethoscope for locating vacuum leaks by replacing the probe with a length of plastic hose or fuel line. Spraying With Liquid. Another trick, for small leaks such as loose intake manifolds or shrunken injector seals, is to spray them with carb cleaner. This will temporarily seal a leak and a rough idle will smooth out for 10-15 seconds: you will hear the change in idle rpm.

11-05-2008, 12:14 PM	#1 (permalink)
Ayman L Junior Member Join Date: Nov 2008 Posts: 1 Diggs: 0 My Profile Profile Last Updated: 11-05-2008	how can I check for vacuum leaks on my bike (honda vtx)? after rejetting my honda vtx, it now chokes when I turn on the throttle. I checked air-fuel mixture, and checked all hoses, all seems good. I was told I might be having a vacuum leak. anyones knows how to check for that.

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11-06-2008, 04:04 PM	#2 (permalink)
broken_pole_texas Junior Member Join Date: Nov 2008 Posts: 1 Diggs: 0 My Profile Profile Last Updated: 11-06-2008	Drive it underwater and look for bubbles.

11-08-2008, 12:53 PM	#3 (permalink)
PsychProf Junior Member Join Date: Nov 2008 Posts: 1 Diggs: 0 My Profile Profile Last Updated: 11-08-2008	Start the honda. Find or buy a 3' length of new fuel hose. Stick one end in your ear and snoop around the intake system with the other end listen for any pronounced "hisssssssing...". [Warren Bain] I was able to isolate a vacuum leak with a mechanic's stethoscope with the probe removed and only using the tubing to get very close to the gasket and follow the contour of the manifold. You can also modify the stethoscope for locating vacuum leaks by replacing the probe with a length of plastic hose or fuel line. Spraying With Liquid. Another trick, for small leaks such as loose intake manifolds or shrunken injector seals, is to spray them with carb cleaner. This will temporarily seal a leak and a rough idle will smooth out for 10-15 seconds: you will hear the change in idle rpm.

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