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Post by Danielle Belle on Mar 5, 2018 3:07:55 GMT -5
Recently my scooter has been making a chirping type sound. It's coming from the bottom left side near the belt. It's only noticeable when I'm stopped/idle. Also when I'm riding my scooter it starts vibrating at around 25-30mph. Anyone have any ideas whats causing this. I've had the clutch, variator and belt checked and they said everything is fine. Any advice?
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Post by 90GTVert on Mar 5, 2018 7:45:51 GMT -5
Got a vid of the sound by any chance?
Probably the most common source of a speed relative vibration is a tire being out of balance. Usually it will come on slowly around a certain speed, increase in frequency as speed increases, and then decrease in frequency and go away as speed increases even more. Could be other things with the same symptoms though. I had a bent primary drive shaft (what the clutch rides on) that did the same thing. Things like a bent wheel or out round tire may do it. Could be something in the CVT itself being out of balance. If the issue has always been present or always present since the last tire change, I'd consider balancing the wheel/tire. It can be done with weights, but an easy way is to use beads or a slime type of product like Ride-On. Dynabeads are the most popular beads, but some even use stuff like airsoft BBs. Any of those types of products need to be weighed or measured based on wheel/tire size so check into that before using.
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Post by dexameth on Mar 5, 2018 12:01:50 GMT -5
When those symptoms happened to my scoot, the cheap belt had a chunk missing from it. I could feel a "shutter" at take off and it would fade away with more speed. I'm glad I caught it before it left me stranded miles from home.
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Post by pinkscoot on Mar 5, 2018 12:26:59 GMT -5
 It could also be a motor mount causing the chirping. My old Znen had a chirp when I went over bumps. I torqued the motor mount it went away.
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Post by dexameth on Mar 5, 2018 12:29:59 GMT -5
 It could also be a motor mount causing the chirping. My old Znen had a chirp when I went over bumps. I torqued the motor mount it went away. Ahh yes, true! I even had a phone mount chirp when hitting bumps... |
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Post by Danielle Belle on Mar 5, 2018 20:17:49 GMT -5
Are any of these a major problem. Like they have to get fixed right away. If it is the motor mpunt or the tire needing balanced?
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Post by 90GTVert on Mar 6, 2018 9:34:53 GMT -5
If the vibration is only bad enough to be a nuisance, it may not be anything that you need to fix right away. Kinda depends what it is. I had a bent shaft in the CVT that made a vibe similar to a tire out of balance and that caused premature wear of all bearings in the gearbox, so it's possible that it has negative effects.
If it's something like a belt that's chewed up, then you're at risk of a belt failure (breakdown and possibly tearing up more things when it goes).
All depends exactly what the actual issue is.
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Post by GrumpyUnk on Mar 7, 2018 14:39:06 GMT -5
If the chirp is ONLY audible when stopped and at idle, the only thing rotating is the variator. The clutch and wheels are stationary, and the clutch bell and driven parts(centrifugal springs & shoes) are immobile also.
Were it me, I would be inspecting the moving and fixed parts of the variator, removing it, and checking the sheave(?) that the variator moves back and forth on. If it is sticky or dirty, when the variator is spinning(whenever the engine crankshaft is moving), and you are unmoving, the variator can rub against the belt, as can the 'hub' portion of the variator, which would be more likely if the clutch (at the other end of the belt) has not retracted enough to allow more slack in the belt.
In shorter terms, I'd do a removal, cleaning, inspection of both the clutch, variator and belt. If it is very minor, you can expect that as the belt is riding(at rest) on/within the moving parts of the variator, and a bit of a squeak is not unexpected.
tom
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Post by 90GTVert on Mar 7, 2018 14:47:22 GMT -5
If the chirp is ONLY audible when stopped and at idle, the only thing rotating is the variator. The clutch and wheels are stationary, and the clutch bell and driven parts(centrifugal springs & shoes) are immobile also. The variator, clutch, and rear pulley should all spin at idle. The clutch bell, primary driveshaft, and other gearbox components will only move once the clutch rotates fast enough to overcome spring force and grab onto the bell to rotate it. The clutch and rear pulley spin freely (hopefully) on the primary drive shaft and the variator that's attached to the crank will rotate them via the belt any time it's moving. If the belt is slipping and not spinning those parts, the belt will wear fast. Any belt long enough to disengage totally at this point may come off of the pulleys. Even with slightly too long of a belt I've found that too much slack (not enough to not spin the rear pulley) makes for a lousy takeoff. |
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Post by lilpinny on Mar 7, 2018 16:47:13 GMT -5
I've gotten a chirping before but it came out my carb when idling. I forgot what fixed it but was in my TR build thread
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Post by GrumpyUnk on Mar 8, 2018 9:58:04 GMT -5
90gtvert:The variator, clutch, and rear pulley should all spin at idle.
Oops. You are correct. I was incorrect. Somehow I got the 'bell' confused with the centrifugal clutch pulley and shoes. That adds to the 'parts count' of things that could be squeaky. And, again, I'd suggest removing and cleaning both variator and clutch, paying attention to any bearings included that are so easy to overlook. They need love and attention also even though hidden away. SLIGHT amounts of lube make a lot of difference.
tom
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Post by Danielle Belle on Mar 9, 2018 21:19:26 GMT -5
So I fixed the chirping sound. For some reason I replaced the belt and the chirpimg went away. Now I have a new issue after changing the belt. Now when I come to a stop the acooter seems to jerk forward a couple times. Its not a major jerk but it'll only do it when I comw to a stop. Not when idling. Any suggestions as to what is causing it.
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Post by lilpinny on Mar 9, 2018 23:01:41 GMT -5
The new belt is slipping. Let it break in.
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Post by Danielle Belle on Mar 9, 2018 23:30:31 GMT -5
How long does it take for the new belt to break in?. It was just put on today
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Post by benji on Mar 9, 2018 23:40:57 GMT -5
Were your hands clean when you swapped the belt? The belt surfaces should be clean and free of grease, oil, or dirt. It should only take a couple days to break in, and you should honestly barely notice it. If it keeps acting strange, open it back up and look in there for a reason.
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It could also be a motor mount causing the chirping. My old Znen had a chirp when I went over bumps. I torqued the motor mount it went away.
It could also be a motor mount causing the chirping. My old Znen had a chirp when I went over bumps. I torqued the motor mount it went away.
