Sluggish/lack of power - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 70 (permalink) Old 06-28-2019, 04:48 PM Thread Starter
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Sluggish/lack of power

08 Vulcan 900 classic. On the way to work and about 15 minutes into the drive I was accelerating got to about 55 couldn’t get any more out of it. Too much throttle and it bogged down. I managed to maintain about 55 the rest of the way. After work I drove with same symptoms to a gas station and being near empty, I filled up on marine grade high octane ethanol free gas. I read on an earlier post where someone with the same/similar symptoms replaced spark plugs and that didn’t work for me. Now I’m struggling to maintain 40 mph. Even in neutral the throttle cuts out without allowing the bike to reach high rpms. Any thoughts/suggestions are greatly appreciated. I just got the bike Monday and I’m eager to get back on it.
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post #2 of 70 (permalink) Old 06-28-2019, 05:18 PM
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Kind of sounds like an injector that isn't meeting the flow requirements the ecu is demanding. Might be clogged or gone bad

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2006 Vulcan 900 Classic
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post #3 of 70 (permalink) Old 06-28-2019, 06:33 PM
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I had similar conditions with a dying battery, something worth looking into.

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post #4 of 70 (permalink) Old 06-28-2019, 10:52 PM
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If I had to guess- maybe it's the stator? I hear when those have problems on older bikes the battery drains and it needs to be replaced.

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post #5 of 70 (permalink) Old 06-29-2019, 05:05 AM
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This sounds like a fuel problem. Not the gasoline put into the bike, but a fuel system delivery issue. My guess would be a fuel pump issue, most likely a partially clogged fuel filter. Unfortunately, on the Vulcan 900, the fuel filter in an integral part of the fuel pump.
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post #6 of 70 (permalink) Old 06-29-2019, 08:07 AM Thread Starter
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Just to be clear, I’m new to owning a bike and although I’m not trying to make anyone mad, I might question your response only because I’m trying to learn. How could the stator cause my throttle issues? Where would I install a pressure gauge to test the fuel pump?
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post #7 of 70 (permalink) Old 06-29-2019, 09:31 AM
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The reason the dying battery causes this is because it does not have enough power to send fuel through the injectors at the right pace.

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post #8 of 70 (permalink) Old 06-29-2019, 09:44 AM Thread Starter
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Thanks G man. Battery and charging seems good. About 12.8v engine off. 14.7v engine on. And today it seems worse. Just tried going down the road and struggled to reach 20 mph.
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post #9 of 70 (permalink) Old 06-29-2019, 10:04 AM
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1. How many miles on it?
2. Post a picture of the new and old plugs.
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post #10 of 70 (permalink) Old 06-29-2019, 10:21 AM Thread Starter
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3,418 miles, previous owner was navy and rode to work daily 8mi. With occasional road trip.
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