GoPro ride and engine thump - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 24 (permalink) Old 03-31-2014, 07:47 AM Thread Starter
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GoPro ride and engine thump

Got a gopro hero3+, great camera. At the beginning of the clip when i get to the stop light, you can kinda hear the thump I've been talking about on the front cylinder. Sorry about the rattling sound which is the fishing leeder I used to make sure my new camera doesn't become road kill if the mount fails.

The thump goes way when you're going and the bike runs smoothly. Idle jet on the rear?

http://youtu.be/DeDI-04RTGo

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post #2 of 24 (permalink) Old 03-31-2014, 10:48 AM
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The thump goes way when you're going and the bike runs smoothly. Idle jet on the rear?
I can hear it even when you get up to speed, and it sounds down low in the engine... i really don't think it is a carb issue, unless no fuel is flowing in there and I am hearing a dead piston moving.
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post #3 of 24 (permalink) Old 03-31-2014, 10:54 AM Thread Starter
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I can hear it even when you get up to speed, and it sounds down low in the engine... i really don't think it is a carb issue, unless no fuel is flowing in there and I am hearing a dead piston moving.
Definitely no dead piston. She flies. I wasn't even goos'n it in this video. Still, PEOPLE WILL NOT STAY OUT OF THE LEFT LANE!

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post #4 of 24 (permalink) Old 03-31-2014, 10:58 AM
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I have had mine up to 110 on one piston, and she seamed to scoot along fine, then when I got both working she flew. I had the same noise you do as well.
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post #5 of 24 (permalink) Old 03-31-2014, 11:07 AM Thread Starter
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I have had mine up to 110 on one piston, and she seamed to scoot along fine, then when I got both working she flew. I had the same noise you do as well.
Ok, so how do I test this theory? wouldn't this thing be backfiring and all kinda stuff goin' on?

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post #6 of 24 (permalink) Old 03-31-2014, 11:57 AM
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Goofy, I do not hear well. I watched it twice, sounds like a dead cylinder or small exhaust leak to me. Too much throttle to move away from a stop sign.

You the guy that had trouble with synching? If so I would look for one carb with a plugged pilot circuit.
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post #7 of 24 (permalink) Old 03-31-2014, 12:15 PM Thread Starter
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Goofy, I do not hear well. I watched it twice, sounds like a dead cylinder or small exhaust leak to me. Too much throttle to move away from a stop sign.

You the guy that had trouble with synching? If so I would look for one carb with a plugged pilot circuit.
So how do I check for a dead cylinder and then can I back blow the pilot?

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post #8 of 24 (permalink) Old 03-31-2014, 12:50 PM
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Goofy, does the motor USUALLY require a little cranking and nearly always likes a little choke when cold?

Describe how it starts. Mine starts warm instantly, when cold, half choke fires instantly.
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post #9 of 24 (permalink) Old 03-31-2014, 12:59 PM
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So how do I check for a dead cylinder
Cylinder short test ... Remove/replace plug wire as it idles, listen for any change. No change, dead cylinder. Would have to remove two plug wires, then replace one for the test, in this case.

Not a fan of backblow. Seems it would create a mushroom cloud of loose crud inside a dirty carb. I now it works in some cases, but anyway .... It can't remove crud, just move it around.

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post #10 of 24 (permalink) Old 03-31-2014, 01:20 PM Thread Starter
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Goofy, does the motor USUALLY require a little cranking and nearly always likes a little choke when cold?

Describe how it starts. Mine starts warm instantly, when cold, half choke fires instantly.
Mine starts ok cold, sucks starting warm.

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