Knockin' - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 4 (permalink) Old 07-27-2019, 08:28 AM Thread Starter
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DANAD's Avatar
Join Date: Mar 2009
Location: Edson, Alberta, Canada
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I have an 08 Custom that I have upgraded with Cobra HP 2 to 1 pipes and a Barron Big Air Kit. I don't ride it much, in fact it hasn't even been started for 2 years and has only run 4mi in the last 3....(I have an 04 V2K that sees a lot of use). The 900 has 7100kms (4700mi) on it and has only been on one long trip (Sturgis 08) so I shouldn't have any serious mechanical issues.....? I pulled it out of storage yesterday, put a battery in it and ran it in the shop for 20min or so to make sure it was ok. It was ticking pretty good while cold but that went away pretty quickly. (I had changed the oil out when I put it in storage and added fuel conditioner to a full tank).. When it was warmed up, I hopped on and rode it for about an hour. I noticed that there was a slight knock in the engine when under fairly aggressive acceleration but it went away as soon as I backed off a bit. It sounded like a pre-ignition knock, but these 900s are relatively low compression so we shouldn't get that should we? Have I got enough mileage on it to require valve adjustments? Am I only "hearing" the noise because I have the BAK and the noise transmits thru the intake? I truly haven't spent enough time on the bike to know what it sounds like normally.... lol. Opinions welcome!

2004 VN2000
V&H Pipes
BAK, Mustang Seats, Scootworks Tour Trunk
HD Softail lowers, Memphis shield
Darkside Falken Zeix 205/65/16 rear, Bridgestone Excedra Max front
2008 900C as barhopper
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post #2 of 4 (permalink) Old 07-27-2019, 01:18 PM
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Location: South Coastal Oregon
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Suggest draining the gas tank and filling with fresh fuel. Fuel conditioner loses effectiveness and generally after a year or so its effect is nil. Also gasoline tends to lose octane after a time, so the combination of factors could result in what you are hearing.

'07 Kawasaki Vulcan 900 Classic LT

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post #3 of 4 (permalink) Old 07-27-2019, 08:19 PM
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Rider 50's Avatar
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Location: Pacific Northwet
Posts: 669
I am with "Hot Cruiser" Put new oil in it too, Start with all known fluids.

2007 VN 900LT
Ebony Black & Galaxy Silver

Highway bars w/pegs
Saddleman studded seat
Cobra 2 into 1 HP Pro w/peashooter tip
Luggage rack
Home brewed aux. brake light
Home brewed Leather Lowers
Highway bar Chaps
Cobra FI2000 Tri-pot
Redneck air box/K&N filter
Headlight modulator
Other stuff
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post #4 of 4 (permalink) Old 07-27-2019, 08:53 PM
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Join Date: Aug 2017
Location: DFW area
Year/Make/Model: 2013 Vulcan 900 Classic LT
Displacement/CC's: 900
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Gender: Male
Posts: 318
Yes, agree with Rider50 and Hot Cruiser.
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