Wildguzzi.com
General Category => General Discussion => Topic started by: earemike on July 10, 2015, 12:00:06 AM
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Hi all,
hope someone can confirm my suspicions or tell me I'm way off base.
Riding the '77 LeMans at around 3.5-4.5k rpm I could hear a rattle in the driveline that was causing me concern. If I get on the berries up the rev range I don't notice it at all. I'm guessing when everything is under load it's fine but when revs are near constant there's some lash in the uni-joint (or possibly the splined shaft?).
I've ordered some parts expecting the uni joint will need swapping out sooner or later regardless.
If you can spare a moment to look at my video of the bike running in first on the stand & throw in your opinion about the knock I'd appreciate it. If running it in first on the stand in itself is a bad idea you can scold me for that too! I'm posting as I'm guessing but some of you will know!
Thanks
https://vimeo.com/133110362 (https://vimeo.com/133110362)
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Get ready for the scolding , I did that once , and almost half the board told me to never do that again , and that was the nice half :laugh:
Probably a U joint , push on the boot around it .
Dusty
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Probably at least the u-joint. To monitor the condition of the u-joint before it get's this bad, rotating your wheel back/forth when the bike is off, the more slop doing that the more your u-joint is worn. :wink: After you get a new u-joint in there you will know what doing this feels like as a reference. I do this same test on my 750 Breva.
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Is it making a noise when you are riding it or just on the stand? If it's doing that when you're riding it you have a problem. If it's only doing it on the stand? Well? Just don't.
Pete
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Get ready for the scolding , I did that once , and almost half the board told me to never do that again , and that was the nice half :laugh:
Probably a U joint , push on the boot around it .
Dusty
Thanks Dusty, I figured it wasn't designed to run without load. I hope the board considers me thoroughly scolded!
I'll give the u-joint a prod later to see if anything feels odd.
Probably at least the u-joint. To monitor the condition of the u-joint before it get's this bad, rotating your wheel back/forth when the bike if off, the more slop doing that the more your u-joint is worn. :wink: After you get a new u-joint in there you will know what doing this feels like as a reference. I do this same test on my 750 Breva.
Thanks Wayne, I did try feeling the 'slop' at different parts of the wheel rotation but couldn't tell the difference. I used my other LeMans as a reference (runs beautifully on the road) but couldn't notice a difference!
Is it making a noise when you are riding it or just on the stand? If it's doing that when you're riding it you have a problem. If it's only doing it on the stand? Well? Just don't.
Pete
Yes Pete, when I'm riding but not all the time. When sitting on 3.5-4.5k rpm I can usually hear it but if I wind on the power I can't notice it. When I say can't notice it I can't hear or feel it & the bike feels great.
Because it was only at a certain RPM & specific load I was thinking the uni-joint or splines must be worn unusually.
I did find pieces of teeth in the rear drive sump when I changed the Dif oil (850T dif). I can add a pic when my internet is working better
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If it sounds like a helicopter is following you down the road when you're riding it the UJ is buggered.
Pete
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broken cush drive spring can cause driveline slop
run it on the centerstand but drag the rear brake for load... (donning asbestos suit)