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Post by bendover on May 21, 2015 7:35:36 GMT -5
When I drive, at certain rpm/gear it starts making noises "ruvruvruvruvruvruv" kinda fast. When accelerating past this point, or before it, there is no such sound. It is hard to determine if it is bound to rpm or to cvt position or to actual speed. I am afraid it is some kind of bearing.
(Aerox, stock variator, stock rear pulley. Tried 2 different clutches while keeping the same bell, problem persist)
Have anyone some clue as to what it might be, and/or how to troubleshoot?
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Post by 90GTVert on May 21, 2015 8:11:02 GMT -5
It could be just an imbalance in the wheel/tire. If that is the case generally it will change in frequency with speed to some degree. Find a spot where there isn't a lot of traffic or other dangers to look out for so you can monitor speed and RPM with more scrutiny. If it's RPM dependent then you may be looking at an engine issue. Speed related is more likely to be wheels/tires or CVT and gearbox.
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Post by 2stroked on May 21, 2015 11:46:56 GMT -5
Kinda does sound like a wheel/tire the way you described it. How lo g has it been doi g this? Did you change anything right BEFORE it started?
I am not sure about scooter tires, but the tire on my old Ascot did this. I busted a belt or something on a curb I was foolishly going over. 140$ mistake thankfully while I had a good job.
Did this start suddenly, or did it start kinda soft and just slowly got worse?
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Post by bendover on May 21, 2015 19:47:44 GMT -5
It could be just an imbalance in the wheel/tire. If that is the case generally it will change in frequency with speed to some degree. Find a spot where there isn't a lot of traffic or other dangers to look out for so you can monitor speed and RPM with more scrutiny. If it's RPM dependent then you may be looking at an engine issue. Speed related is more likely to be wheels/tires or CVT and gearbox. Thanks mate. I dont feel it _at all_ until im within a certain range, say 80-85% rpm/speed/whatever. I can easily avoid it by giving more gas - engine rev up + more speed, vibrations are gone. It comes suddenly and disappears suddenly too. I can feel it in the scooter, not even sure its a sound or if its just vibrations. Any ideas of how to easily rule out if the vibrations are from belt/cvt/wheel/engine? I can remove belt to test engine alone. I can remove rear wheel to rule it out. I can remove clutch bell to rule that out. I can even remove variator to rule that out. But that's a lot of work, are there any "smarter" ways? |
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Post by bendover on May 21, 2015 19:54:37 GMT -5
Kinda does sound like a wheel/tire the way you described it. How lo g has it been doi g this? Did you change anything right BEFORE it started? I am not sure about scooter tires, but the tire on my old Ascot did this. I busted a belt or something on a curb I was foolishly going over. 140$ mistake thankfully while I had a good job. Did this start suddenly, or did it start kinda soft and just slowly got worse? I noticed it as soon as I got the scooter tuned with 70cc etc, before that it didnt reach those revs/speeds where they are noticeable. It have not gotten any worse I think, about the same. The vibrations are pretty fast, I have had vibrations in a wheel on my cars when braking, and even if going pretty fast, 100kph+, those vibrations were much lower frequency. I hope it's the wheel. It actually have a little repair in one spot, some retart previous owner damaged the tire when mounting it, so the little rubber-clad-steel rim on the inside had a little scratch, leaking air. We put some silicone there. Hard to believe they are so sensitive though :/ |
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Post by 2stroked on May 22, 2015 8:19:21 GMT -5
Almost sounds like a wheel bearing, but you'd notice that easily. I don't know just how sensitive these tires are. I hope they aren't too sensitive, its hard enough to look masculine on a fifty cc scooter, with out slowing down for every tiny bump. The fact that its fast and the kick start, help the masculinity level,a little. I need to put a beefy ass kick lever on one of these days.
EDIT: Good thing I don't give a crap what people think of me when I ride. I'd still ride if my scoot was painted pink with purple trim. I'd just try to ride at night.lol lol lol
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Post by 90GTVert on May 23, 2015 7:38:02 GMT -5
Wheel/tire imbalance is incredibly common in scoots, especially if you aren't running quality rubber, and that will do what you're describing as best I can tell. If that steel wheel is bent anywhere that may do it. A simple solution may just be to try a balancing product that goes into the tire like DynaBeads or Ride-On. Some have reported just using plastic airsoft BBs, I believe about 2oz in a tire. The off the shelf products will tell you how much to use if you go that route and you can prob use their recommendations to help if you decide to go with some home brew solution. They aren't miracle workers, but if you did add something like that and the vibration went away or changed you could be fairly certain you're looking at a wheel/tire balance problem.
I've secured a scoot before and removed various bits to find a vibration but first you'd have to be certain you can tell it happens when secured with the wheel off of the ground before bothering to try any of that stuff. Be very sure it's secure too. The last thing you need is for the tire to hit the ground when spinning at a high rate of speed.
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Post by bendover on May 23, 2015 13:12:19 GMT -5
Wheel/tire imbalance is incredibly common in scoots, especially if you aren't running quality rubber, and that will do what you're describing as best I can tell. If that steel wheel is bent anywhere that may do it. A simple solution may just be to try a balancing product that goes into the tire like DynaBeads or Ride-On. Some have reported just using plastic airsoft BBs, I believe about 2oz in a tire. The off the shelf products will tell you how much to use if you go that route and you can prob use their recommendations to help if you decide to go with some home brew solution. They aren't miracle workers, but if you did add something like that and the vibration went away or changed you could be fairly certain you're looking at a wheel/tire balance problem. I've secured a scoot before and removed various bits to find a vibration but first you'd have to be certain you can tell it happens when secured with the wheel off of the ground before bothering to try any of that stuff. Be very sure it's secure too. The last thing you need is for the tire to hit the ground when spinning at a high rate of speed. Thanks man, great reply! Will report back if I find anything. I noticed I read it in your voice, been watching too many of your videos! =) |
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Post by niz76 on May 23, 2015 13:46:40 GMT -5
Haha- I've found that Brent's voice sounds almost exactly like my best friends older brother. The funny thing is his name is Brent also lol.
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Post by 90GTVert on May 23, 2015 18:15:13 GMT -5
Most comments I get are about being monotone so I'm sorry you're stuck reading like that. lol Maybe next time imagine James Earl Jones or Mike Rowe or Clint Eastwood replies to you. Go ahead, balance that tire if you feel lucky.
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Post by katastroff on May 24, 2015 8:02:37 GMT -5
Most comments I get are about being monotone so I'm sorry you're stuck reading like that. lol Maybe next time imagine James Earl Jones or Mike Rowe or Clint Eastwood replies to you. Go ahead, balance that tire if you feel lucky. |
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Post by bendover on May 24, 2015 13:36:49 GMT -5
haha love this thread =P Well, update on the "question in question": New variator did NOT fix vibration. Change of complete rear assembly (pulley/clutch/bell etc) did NOT fix vibration. I did notice that on the fixed half of the variator, one of the cooling fins are cracked - See pics here, pic 2 and 5: imgur.com/a/eed0V . Will this cause enough weight imbalance/air resistance imbalance to vibrate? |
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Post by thatcrazyguy on May 24, 2015 20:19:43 GMT -5
haha love this thread =P Well, update on the "question in question": New variator did NOT fix vibration. Change of complete rear assembly (pulley/clutch/bell etc) did NOT fix vibration. I did notice that on the fixed half of the variator, one of the cooling fins are cracked - See pics here, pic 2 and 5: imgur.com/a/eed0V . Will this cause enough weight imbalance/air resistance imbalance to vibrate? It should not. I have ran a variator with 2 missing fins. |
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Post by Elektrey on May 24, 2015 20:21:11 GMT -5
it shouldn't, but what it could do is with a weak crank it could amplify those vibrations or it could put more wear and tear on the crank.
Have you measured side to side play with the crank?
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Post by bendover on May 25, 2015 4:06:23 GMT -5
it shouldn't, but what it could do is with a weak crank it could amplify those vibrations or it could put more wear and tear on the crank. Have you measured side to side play with the crank? I have not, do we have any instructions? I have tried to feel if the variator have any play sideways or vertical looking at it from in front, ie forward backwards in the scooter facing direction (to check bearings) , it feel solid, but very unscientific. |
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