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Scooters - 50cc => People 50 => Topic started by: blufx on December 31, 2015, 10:02:59 PM
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I have this noise sometimes. When it happens, there's a big power loss. I noticed it before I installed the 70cc BBK, and it's still there. Sometimes, I can start off and I don't hear it. When that happens, I have plenty of power, but if it starts, power drops a lot.
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Remove the CVT cover, have a look, and report back.
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I should have mentioned I've taken it all apart. Everything looks great. I replaced the belt. The variator weights have a slight flat spot on them. I've seen a lot worse and not hear anything. Yesterday, I noticed I could start off holding the rear break and prevent the rattle. Today I pulled the rear wheel expecting to find loose springs or something. Everything is just the way it's supposed to be. I can't see it involving the final drive gears. If they made noise, it would be constant.
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Did you check on the clutch?
Check stiffnes bell and pads.
Enviado desde mi SM-G920I mediante Tapatalk
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How many kilometers on scooter? When did you change transmission oil last? Rollers with flat spots are not working optimum, may be combination of worn parts causing issue, I don't know. Good luck finder problem.
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Only 5200 miles (8,368 kilometers) the scooter. It has a variator pulley system with belt drive and centrifugal clutch. There is no transmission oil. Clutch pads and springs all look like new.
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Did you check on the clutch?
Check stiffnes bell and pads.
Enviado desde mi SM-G920I mediante Tapatalk
Everything looks like new. Springs are stiff and the pads are hardly showing any wear.
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Yes, does have transmission (gears) and takes approx 3 oz 90w gear oil. Owner's manual recommends replace gear oil at 300k, 3000k, and 7000k. If never been replaced, may be the problem?
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Yes, does have transmission (gears) and takes approx 3 oz 90w gear oil. Owner's manual recommends replace gear oil at 300k, 3000k, and 7000k. If never been replaced, may be the problem?
You're correct. I wasn't thinking about the three gears in the final drive. However, I doubt the rattle is coming from the gears. If a cog were missing, it would produce a clunking sound and that would be there all the time. If it were low on oil, there would be again, a constant whine, not a rattle. But thanks for the input. I'm going to change the gear oil just because I doubt it's been done.
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I decided I'm going to pull the rear wheel again. It takes such a light touch on the brake to stop the rattle, I think it has to be related to the brake shoes. Today I'm going to remove the shoes and take it for a ride. I shouldn't have to go far to know if it is. Then I'll try to figure out why it is. Your thoughts are welcome.
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I wouldnt ride without the shoe... take it apart clean it inspect the shoe lube it and then go for a spin.
Enviado desde mi SM-G920I mediante Tapatalk
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I wouldnt ride without the shoe... take it apart clean it inspect the shoe lube it and then go for a spin.
I do appreciate your concern, but as I said I won't have to go far (less than a 1/4 mile) to know. I've investigated everything else. Now by eliminating the brake shoes, I'll know for sure very shortly. Everything will be cleaned and properly lubed when I put it back together. The shoes and linings look very good. Pads are around .140 inch thick(3.55mm). Service limit is 2mm, so they still have plenty of miles left on them. As you can see in the pic, with the exception of some brake dust, they're in perfect condition. Rather than reduce the image size, I uploaded the pic to my Box account. Here's the link: https://app.box.com/s/4hs7xekgbiufea5m8y246fud8ca8p0cs
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No picture on your link for me, could be my computer....
Karl
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No picture on your link for me, could be my computer....
Karl
I just checked the link. The pic is there.
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Dammit! lol! I was so sure I was going to find it, but it was still there and this time I couldn't touch the brakes to make it go away. Back to the drawing board. I cleaned the brakes and putting them back. I did notice there was no grease on neither the anchor pin or brake cam. I added another pic to my upload of the brake shoes after cleaning them, although there's little difference. The first pic is the after cleaning. https://app.box.com/s/4hs7xekgbiufea5m8y246fud8ca8p0cs
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Latest update: Nothing. Adding grease to the anchor pin and cam didn't stop it, so the rattle isn't brake shoe chatter. That leaves the variator and final drive gears as possible suspects (I hope I don't have to eat my words there).
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It's not brake related. Since there was no grease on the pin or cam, I was hoping it might have been chatter from the shoes. No dice. I opened the final drive today and found nice clean gears, lots of clean oil on them, and bearings that I cant detect any play in. Even with the drive shaft hanging 5 inches out of the bearing, it only has about .,04 inches (1mm) of play at the opposite end of the shaft. I'm not going to replace all them just to see if that fixes it. They would have to have notable play to produce this noise. I'm running out of things it could be. I guess I'll get a new set of weights for the variator. If that doesn't do it, I'm at a loss.
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Check the bell clutch. My brothers scoot was deformed and made a huge shake... and i only realized when i placed the bell on paper draw its outter circle and then messured. It had lesd than half a mm but it made it a big pita to ride. Any ways roller change wont hurt and ill give q shot there.. good luck
Enviado desde mi SM-G920I mediante Tapatalk
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Check the bell clutch. My brothers scoot was deformed and made a huge shake... and i only realized when i placed the bell on paper draw its outter circle and then messured. It had lesd than half a mm but it made it a big pita to ride. Any ways roller change wont hurt and ill give q shot there.. good luck
I can see that causing a vibration. Not a rattle, especially a rattle that goes away when slight brake is applied. But I will check it with an indicator after I have it back together. Inside the bell, it looks perfect. A dent would cause the wear in the bell to have a gap, I would think. Anyway, I'll post back when it's assembled. Thanks for the input.