Measuring Vacuum

Has any body tested with a vacuum gauge on there bike? Where did you attach and what were the readings?

Originally posted by Littlefoot:

Has any body tested with a vacuum gauge on there bike? Where did you attach and what were the readings?

Never, but how about plumbing it to the hot start circuit?

I just did the same the other day out of curiosity...

tame the fluctuations by slowly pinching the hose until the needle only wiggles a little.

What you get is repeatable, but I don't know how useful???

My readings were 10-11 in.Hg vac. 11 when idle was on the verge of stalling, 10 or a little less after turning up the idle screw a bit.

That's what I thought. I attached the vacuum gauge hose to the head side carb bell nipple, where my hotstart is attached. Wild fluctuatuions at idle.

surely vac guages are only any good when comparing two carbs or more?

have i missed something here?

Taffy

[ July 13, 2002: Message edited by: Dan Lorenze ]

Typically I would use gauge for indications of valve / valved guide / piston ring condition. Just an indicator mind you. Then if there was cause move on to compression and leakdown testing.

It's just a quick and easy check to throw on a vacuum gauge. Could be any thumper has the fluctuations, never tried one before, just curious.

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