Clacking knocking tapping at hot start - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 24 (permalink) Old 06-25-2017, 10:35 PM Thread Starter
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Clacking knocking tapping at hot start

Hello all...just purchased a 2009 Vulcan 900 with 9000 miles. I didn't notice this on the test drive but when starting the bike after it's warmed up it makes some clacking noises for a minute or two and then quiets down again. There is no loss of power or any other issues but this noise has me a little concerned. Again, it only happens at hot startup and goes away pretty quickly. At cold startup, it's completely smooth and silent.



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post #2 of 24 (permalink) Old 06-25-2017, 11:43 PM
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There is a valve that opens and closes that is part of emissions system. When it opens or closes, the engine sounds different for a few seconds then returns to normal. Maybe that is what you are hearing? Although, it continues to open and close. It doesn't stop.
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post #3 of 24 (permalink) Old 06-27-2017, 10:31 PM Thread Starter
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Thanks Mr crazy rider guy. This noise only occurs at hot start. It gradually gets quieter and completely goes away after a minute or so. I have changed the oil and even tried some Lucas oil stabilizer. Nothing seems to help.



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post #4 of 24 (permalink) Old 06-28-2017, 05:08 AM
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What oil are you using? What filter are you using? Additives are not required to be added and often will do more harm than good.
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post #5 of 24 (permalink) Old 06-28-2017, 09:26 AM
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Noises are almost impossible to troubleshoot over the internet with any certainty.
Posting a video would help.
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post #6 of 24 (permalink) Old 06-29-2017, 10:03 AM
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That noise is normal on all 3 of the Vulcan 900s I have owned. Oil from the head drains out when hot. It will take a few moments to built it all back up. As long as you are using an oil that is good for flat tappets, you should be golden. These engines will last a VERY long time.

Here are the oils that will work:
5w-40 - Diesel
10w-40 - Motorcycle
15w-40 - Diesel

Other weights may not be optimal. Do not use straight weight, or car oil. Often dealers can run sales on OEM branded oils. So it is possible to run Honda, Suzuki oils in your kaw if the price is right.
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post #7 of 24 (permalink) Old 06-29-2017, 11:16 PM Thread Starter
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Cool thanks mr forddeisel69. It's good to know someone else has experienced this. I drained the Lucas and replaced with fresh valvoline conventional 10w-40 motorcycle oil.

sfair...I will post a video soon. Thanks for all the comments.



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post #8 of 24 (permalink) Old 06-30-2017, 12:21 AM
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sfair...I will post a video soon. .
Good. It would be poor practice to write the noise off as "they all do it" until positively identified.
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post #9 of 24 (permalink) Old 07-04-2017, 12:45 PM Thread Starter
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Hey guys I'm having trouble uploading the video from my phone. It only lets me select pictures from my phone. Any suggestions?
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post #10 of 24 (permalink) Old 07-04-2017, 02:26 PM
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Hey guys I'm having trouble uploading the video from my phone. It only lets me select pictures from my phone. Any suggestions?
Upload to youtube and link it here. Or, if using Google, save video to Google Drive and link it.
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