Question for 1700 owners - Page 2 - Kawasaki Vulcan Forum : Vulcan Forums
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post #11 of 22 (permalink) Old 10-30-2012, 09:33 PM Thread Starter
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Don't drink, so I know for sure that's not an issue. I'll hopefully get some video sometime soon.

1996 Harley Davidson FXDS with a lot of stuff. Yes, it's fast, yes it will pull the front tire in 1-3rd. No it's not a stock evo.

2011 Vulcan 1700 Vaquero
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post #12 of 22 (permalink) Old 10-31-2012, 07:50 PM
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Yep i have the same noise on my Nomad.
Sounds to me like a bearing knock in the bottom end, bike seems to run ok its got 12000k's on it now. I have my suspicions that it may be fuel knock when you blip the throttle really quickly. Due to the built in delay these bikes seem to have. I gave mine the "throttle mod" treatment and seems to have reduced the incidence.
My bike has done it since new, but as i said it seems to run ok.
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post #13 of 22 (permalink) Old 11-01-2012, 07:31 AM
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Yep i have the same noise on my Nomad.
Sounds to me like a bearing knock in the bottom end, bike seems to run ok its got 12000k's on it now. I have my suspicions that it may be fuel knock when you blip the throttle really quickly. Due to the built in delay these bikes seem to have. I gave mine the "throttle mod" treatment and seems to have reduced the incidence.
My bike has done it since new, but as i said it seems to run ok.
Yeah, my 1700 classic LT has had that internal knock on occasion since day one. 6000 miles on it, no problems so far.
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post #14 of 22 (permalink) Old 11-01-2012, 04:51 PM
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Don't know what kind of Knock you are talking about.

When you blip the throttle, does the engine stutter and hesitate ?

If so is this when you hear the clunk or knock ?

If you answer yes to both the above then, yes I have the same thing on my 2011 Nomad. It got worse when I put the throttle mod on it, prior to the throttle mod it mostly did nothing when I blipped the throttle, no rpm gain, just kinda nothing. The throttle lag is the result of Kawa's electronic throttle.

I have to gradually increase rpms before I blip the throttle or else I get a very detectable knock. Evidently the ECM is not able to deal with a fast increase of throttle from idle (resulting from the throttle mod).
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post #15 of 22 (permalink) Old 11-01-2012, 06:14 PM
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clunk

My 2010 Nomad does the same thing. Bear in mind those are large pistons slinging around. Because of the single pin crank design of this v-twin, if you goose the throttle from idle, you will get a "slap" from the engine. I don't think it is anything to worry about.
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post #16 of 22 (permalink) Old 11-01-2012, 06:44 PM
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My 2010 Nomad does the same thing. Bear in mind those are large pistons slinging around. Because of the single pin crank design of this v-twin, if you goose the throttle from idle, you will get a "slap" from the engine. I don't think it is anything to worry about.
I'm not so sure on that Timberwolf (with all due respect). My previous Harley had a single pin crank (all Vtwins do) and I never got anything like that. I think it's the ECM timing and reactions to the throttle.

I try not to blip my Nomad since I'm afraid it's a pre-ingition knock. In normal engine (that's not worn out) there should be no piston slap or rod beaing knock.
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post #17 of 22 (permalink) Old 11-02-2012, 04:25 AM
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RWB, i think we're all on the same page with this. I reckon you're spot on, i couldnt place what the sound reminded me of till you said PRE IGNITION knock.
Thats what it would be.
If the bike is idleing really low its more common.
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post #18 of 22 (permalink) Old 11-02-2012, 03:42 PM
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knock

Ya it really depends on exactly what the noise is, hard to tell via a forum . My noise is not pinging, its just a lot of metal to get moving in short order when you goose it from idle. I was just offering an idea, opinion, I'm no expert
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post #19 of 22 (permalink) Old 11-02-2012, 07:55 PM
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I've been concentrating on riding for while and my work schedule has been crunched. Soon I plan to install my new PCV w/Ignition. I don't have anything on the bike but Cobra Tri-Ovals, so I can't put in David's full blown (big air) map. But I'm gonna see if the Power Commander slip on map download takes care of this situation.
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post #20 of 22 (permalink) Old 11-03-2012, 01:26 AM
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The noise reminds me of that pre ignition knock i used to get on my old cars when i turned them off and they kept running for a few seconds, like a clunking knock.
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