Side effect of Vtwin engines - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 12 (permalink) Old 09-10-2015, 07:54 PM Thread Starter
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Side effect of Vtwin engines

…they tend to vibrate things loose after awhile. I had my second casualty tonight. The rivets holding the mounting bracket to the windshield vibrated free and the bag came off. I ended up using some washers as a substitute and secured it with a nut from the windshield framework.

Earlier this year, the vibration rattled the locking mechanism apart on my hard bags, and I lost some of those parts while moving things in and out of the bag. Now I have one locking bag, one that won't lock…which ain't so bad.

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post #2 of 12 (permalink) Old 09-11-2015, 04:14 PM
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Ever heard of Loctite? Use the Blue kind only.

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post #3 of 12 (permalink) Old 09-11-2015, 04:37 PM
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LOL...yup...I've lost a few things on mine over the years too. I generally go over things 3-4 times a years checking tightness and looking to see if anything is loose.

I tear my bike down quite often....and will sometimes forget to tighten something...so my first test run is always done with caution....and all of my tools....

...and yes, blue Loctite is your friend.

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post #4 of 12 (permalink) Old 09-11-2015, 04:47 PM
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Had many bikes over the years, including V-twins, never had anything vibrate loose...(yet). That said, I was almost beaned once by a mirror that vibrated off my son's Harley. LOL He was riding a ways in front of me.

However, I've almost lost the side cover on my Victory CCT a couple times ... training my wife to stop bumping it with her feet has proven to be more difficult than I'd expected LMAO!

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post #5 of 12 (permalink) Old 09-12-2015, 05:42 AM
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For a V-Twin, the Yamaha is one of the smoother running engines. If anything will shake things loose, it would be a big HD with an aftermarket cam. I have never had stuff come loose from vibration either.

I'm always working very diligently to discover the obvious.
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post #6 of 12 (permalink) Old 09-12-2015, 11:05 AM
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Originally Posted by CandyRedVStar View Post
…they tend to vibrate things loose after awhile. I had my second casualty tonight. The rivets holding the mounting bracket to the windshield vibrated free and the bag came off. I ended up using some washers as a substitute and secured it with a nut from the windshield framework.

Earlier this year, the vibration rattled the locking mechanism apart on my hard bags, and I lost some of those parts while moving things in and out of the bag. Now I have one locking bag, one that won't lock…which ain't so bad.
SouthCo sells replacement locks which worked for my roadstar. They might have a match for your bike. I can't remember the model#. I found the match then measured my old one for the correct size.
http://www.southco.com/class/93-keyl...false&filters=
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post #7 of 12 (permalink) Old 09-13-2015, 07:54 AM
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For a V-Twin, the Yamaha is one of the smoother running engines. If anything will shake things loose, it would be a big HD with an aftermarket cam. I have never had stuff come loose from vibration either.
Yeah. I'd almost go so far as to say if it's vibrating that much to knock stuff off, maybe have a go at the various tuning issues. Mine hardly vibrates at all.

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post #8 of 12 (permalink) Old 09-13-2015, 06:47 PM Thread Starter
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Quote:
Originally Posted by afaycasaym View Post
SouthCo sells replacement locks which worked for my roadstar. They might have a match for your bike. I can't remember the model#. I found the match then measured my old one for the correct size.
http://www.southco.com/class/93-keyl...false&filters=
Thanks. I have fiberglass hard bags that are obviously some aftermarket brand. One of these days, I will figure out who makes them and see if I can get the parts. I noticed on Friday that more of the locking mechanism vibrated out…the only thing left is the retaining nut and the main threaded shaft of the whole mechanism. Hope no bees get in there. :roll eyes:

The only Vtwin motor I've owned besides a Yamaha is a Craftsman garden tractor, so I have nothing to compare it to. Mine is pretty smooth at certain speed, creating essentially no vibration, but under acceleration and at 60+, it is noticeable. Mine loves 55-57 mph, according to the speedometer. I can't believe the excessive vibration on H-Ds is actually a source of pride and may be intentionally designed into them… I see them idling at stoplights sometimes and can see the mirrors vibrating from several dozen feet away. Mine vibrate under throttle, but not at idle, or if they do, it is minor.

This is why the Honda flat six continues to keep my attention...

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post #9 of 12 (permalink) Old 09-14-2015, 11:53 AM
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Originally Posted by CandyRedVStar View Post
Thanks. I have fiberglass hard bags that are obviously some aftermarket brand. One of these days, I will figure out who makes them and see if I can get the parts. I noticed on Friday that more of the locking mechanism vibrated out…the only thing left is the retaining nut and the main threaded shaft of the whole mechanism. Hope no bees get in there. :roll eyes:

The only Vtwin motor I've owned besides a Yamaha is a Craftsman garden tractor, so I have nothing to compare it to. Mine is pretty smooth at certain speed, creating essentially no vibration, but under acceleration and at 60+, it is noticeable. Mine loves 55-57 mph, according to the speedometer. I can't believe the excessive vibration on H-Ds is actually a source of pride and may be intentionally designed into them… I see them idling at stoplights sometimes and can see the mirrors vibrating from several dozen feet away. Mine vibrate under throttle, but not at idle, or if they do, it is minor.

This is why the Honda flat six continues to keep my attention...
The level of vibration you describe sounds completely normal to me. I check things over every couple months and will occasionally find something that needs tightening...especially aftermarket stuff. I use loctite as well. I've ridden a number of HDs over the years and some have been ridiculous with the amount of vibration. You can play around with your idle adjustment and usually smooth things out even more.
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post #10 of 12 (permalink) Old 09-14-2015, 12:03 PM
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Complaining about a v-twin vibrating is like complaining that your Corvette rides rough.

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