Compression test nob question - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 74 (permalink) Old 07-31-2013, 10:09 AM Thread Starter
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Compression test nob question

I searched everywhere for directions on compression testing our bikes and even just normal vehicle testing. Is there a post in here someplace with directions? I don't get what you do in our case of two spark plug holes. Do we leave on of the plugs in unhooked? Do we just pull the wires and turn over the engine with the gauge in or do we ground something yadda yadda yadda. If we do ground something, why? How is anything grounded for that matter on rubber tires, I never got that one? My sail boat had a grounding strap sittin in the water. I drag my wife behind the car as a make shift ground and solar sail.

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post #2 of 74 (permalink) Old 07-31-2013, 10:47 AM
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Leave all the spark plugs in, except where you put in the gauge. Pull all the wires off all the plugs. Turn bike over with starter. Stop when needle on gauge stops rising.

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post #3 of 74 (permalink) Old 07-31-2013, 11:11 AM
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I understood it was best to remove power to the coils when doing this to avoid the HT doing damage as it no longer had the plug gap to jump. Also, open the throttle to wide open for best result whilst cranking. Either pull the supply from the ignition circuit or ground the HT leads to chassis. Grounding in this sense means connecting to the frame for a return, not grounding as in connecting to the ground you stand on. The terms "ground" and "earth" have become almost the same and have come to mean connecting to chassis/frame/body so as to complete the electrical circuit for the return current path. Whereas in radio and some other transmission aspects it can actually mean connecting to a metal spike buried in damp earth.

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post #4 of 74 (permalink) Old 07-31-2013, 11:19 AM Thread Starter
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Power to coils

Is there a fuse I can pull or do I just disconnect the ground wire from each coil? I understand the return aspect of DC but why does it have to 'grounded' to a large piece of metal?

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post #5 of 74 (permalink) Old 07-31-2013, 11:37 AM
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Goofy, no ground 'wires' on a vn coil, that I know.
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post #6 of 74 (permalink) Old 07-31-2013, 12:11 PM
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Yes, sorry, you need to pull the ignition fuse.....but not sure which one this is.

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post #7 of 74 (permalink) Old 07-31-2013, 12:16 PM
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what is HT?

thanks, Kenny

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post #8 of 74 (permalink) Old 07-31-2013, 01:08 PM
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Quote:
Originally Posted by Mercury View Post
what is HT?

thanks, Kenny
High Tension??

Hot Teen?

Horrible Term?

Honest Thief?

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Highlighted for Mercury

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Last edited by Knifemaker; 08-01-2013 at 10:01 AM.
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post #9 of 74 (permalink) Old 07-31-2013, 01:41 PM
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One more thing. A compression test should be done with the throttle held wide open, and the engine turned over with the starter till the gauge quits going up.

I am a motorcyclist, NOT a biker.


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post #10 of 74 (permalink) Old 07-31-2013, 01:51 PM
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Quote:
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One more thing. A compression test should be done with the throttle held wide open, and the engine turned over with the starter till the gauge quits going up.
Both of those were mentioned.

Right now the question is -----Is there an ignition fuse??

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