Normal throttle operation? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 07-22-2017, 09:58 PM Thread Starter
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Normal throttle operation?

So I've never had a motorcycle throttle in my hands before, so I just wanted to ask if this is normal operation on the 750's. Basically, when I try to give it light throttle in neutral, it doesn't respond in the first 2-3mm of the turn, but then when the throttle finally responds, it doesn't gently raise the RPM, but rather, throws it straight from 800-2600. Secondly, when I raise it to about 5000, it doesn't drop straight immediately after letting go, but rather, slowly floats down. I was wondering if this is normal, or do I have to make an adjustment to the carburator or anything.

I had also noticed a loose spark plug, and wondering if this could have anything to do with it.
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post #2 of 4 (permalink) Old 07-22-2017, 10:16 PM
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Remove and inspect your spark plugs, you will need the tool to do so in order to tighten it anyhow.

As for the throttle, you may want to get a small adjustable wrench and turn the adjustment nuts in on the throttle to give the cables some slack. It would also be a good idea to lubricate these while you're at it. The carburetor may still have something with it, but lubricating and adjusting your throttle cables is very important and will rule that out before we dig into the carburetors.

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post #3 of 4 (permalink) Old 07-23-2017, 10:23 AM
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Sounds like you might have a sticking throttle or an air leak. When you let go of the throttle the rpms should drop quickly. Either it's sticking or there is an air leak in one of the rubber boots that hold the carbs on to the motor.
Make sure the throttle is snapping back when you let go of it, at the carb, and check the boots for tightness, cracks, or holes. (If you spray some WD40 on the boots while the engine is idling, and the engine speed changes, you have an air leak)

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post #4 of 4 (permalink) Old 07-23-2017, 06:34 PM
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Running lean causes high rpm hangs, though you can tell if it's lean based on if it idles all the way down or stays higher after it hangs.
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