V-Star engine surging after full-service - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 12 (permalink) Old 07-30-2014, 07:26 AM Thread Starter
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V-Star engine surging after full-service

Had a full service done on my V-Star 650 last weekend (fluids, filters, valve adjustment check, etc). Everything seemed great although I don't think we held the throttle open like this at the time. Yesterday I went out to install a K&N filter and thought I'd get some "before" footage to compare to "after" and I noticed this issue. The engine surges / pulses at medium to full throttle. See the linked video.

Any ideas before I call the mechanic back? I'm a new rider and not at all a mechanic, got the bike a few weeks ago and have put maybe 1K miles on it so far. This is definitely something it wasn't doing prior to the service.


Thanks!
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post #2 of 12 (permalink) Old 07-30-2014, 08:45 AM Thread Starter
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Inadvertently had the video as "private". Fixed now, you should be able to see it.
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post #3 of 12 (permalink) Old 07-30-2014, 09:20 AM
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It sounds to me that you are running it up to the rev-limiter?
How does it do when you are riding it?
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post #4 of 12 (permalink) Old 07-30-2014, 09:22 AM
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I'd just call the guy the worked on it. Save yourself some time and give him a chance to fix it....or at least get you headed in the right direction.

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post #5 of 12 (permalink) Old 07-30-2014, 09:32 AM Thread Starter
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Quote:
Originally Posted by farmalldanzil View Post
It sounds to me that you are running it up to the rev-limiter?
How does it do when you are riding it?
I didn't have a chance to ride it, will do so tonight. Maybe I'm imagining a problem where there isn't one?
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post #6 of 12 (permalink) Old 07-30-2014, 11:29 AM
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You are leaving it on the rev limiter, it is supposed to do that to prevent damage to your engine.
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post #7 of 12 (permalink) Old 07-30-2014, 12:18 PM
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In the video you said it does it at full throttle. If in fact you are at WOT then its the rev limiter as mentioned above. With out any load on the engine it would easily over rev and blow without the limiter. I'm no mechanic but personally I would never hold any engine wide open with no load on it. It can't be good for it. If it rides and perform well otherwise I wouldn't worry about.
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post #8 of 12 (permalink) Old 07-30-2014, 12:28 PM Thread Starter
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Originally Posted by Summer View Post
In the video you said it does it at full throttle. If in fact you are at WOT then its the rev limiter as mentioned above. With out any load on the engine it would easily over rev and blow without the limiter. I'm no mechanic but personally I would never hold any engine wide open with no load on it. It can't be good for it. If it rides and perform well otherwise I wouldn't worry about.
That makes sense. Thanks!
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post #9 of 12 (permalink) Old 07-30-2014, 08:46 PM Thread Starter
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Originally Posted by Andiceman View Post
That makes sense. Thanks!
Yep, seems it was a newbie panic attack. Took the bike out for an hour or so this evening and it was flawless.
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post #10 of 12 (permalink) Old 07-31-2014, 07:07 AM
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Glad it worked out! I know the rev. limiter is there to protect the engine but I'd still refrain from doing that. We were in a huge parade with about 6k bikes at our annual bike rally and there's a bridge we all go under that everyone revs it. We could all hear a cruiser type bike hitting the rev limiter and next you hear a loud "metally" pop! and then a lot of smoke......rut row!

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