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Post by mralice on Jul 9, 2023 13:35:36 GMT -5
Hey folks,
Got my first scooter recently. Put it together fine and it runs well, but one major issue thats making it unridable at the moment.
When I pull back on the throttle, it revs, revs louder, louder, then ZOOM I jump to 20+ MPH instantly.
While fast acceleration is certainly nice, its impossible to use this thing around stop signs, stop lights, parking lots, etc. Theres absolutely no speed under 20MPH. Things like a dragster lol.
Like I said, first scooter, so I have no idea what needs to be adjusted so that I can search for how to do it.
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Post by classacted on Jul 9, 2023 14:44:27 GMT -5
the first thing I would suspect is a dirty carburetor.
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Post by Zino on Jul 9, 2023 21:41:41 GMT -5
what brand of scooter ?
4 stroke 2 stroke ?
new or used ?
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Post by mralice on Jul 10, 2023 13:14:58 GMT -5
what brand of scooter ? 4 stroke 2 stroke ? new or used ? X-PRO Maui 50cc 4 Stroke Brand new, freshly assembled out of the box.
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Post by GrumpyUnk on Jul 10, 2023 13:43:51 GMT -5
If you put it up on the center stand, can you slowly twist the throttle and have the engine rpms increase at a reasonable rate? If the engine rpms follow the twist grip throttle, and raise/lower rpms as desired, then I would look at the CVT to see if it has some sort of assembly error. If the CVT hangs, the engine rpms go zoom zoom zoom and THEN all of a sudden, the CVT grabs and about yanks the scoot out from under you, I would look at the CVT, a hanging clutch, hard to move variator, or sticky torque spring/movable hub. I don't know all the legal names.
If the rpms climb and you go nowhere, the clutch could be sticking and finally engage and take off. If that happens, the variator would be 'gearing' as you accelerate, with the rpms tending to stabilize as your speed increases.
Need a closer description of what is happening...?
tom
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Post by mralice on Jul 10, 2023 14:32:04 GMT -5
If you put it up on the center stand, can you slowly twist the throttle and have the engine rpms increase at a reasonable rate? If the engine rpms follow the twist grip throttle, and raise/lower rpms as desired, then I would look at the CVT to see if it has some sort of assembly error. If the CVT hangs, the engine rpms go zoom zoom zoom and THEN all of a sudden, the CVT grabs and about yanks the scoot out from under you, I would look at the CVT, a hanging clutch, hard to move variator, or sticky torque spring/movable hub. I don't know all the legal names. If the rpms climb and you go nowhere, the clutch could be sticking and finally engage and take off. If that happens, the variator would be 'gearing' as you accelerate, with the rpms tending to stabilize as your speed increases. Need a closer description of what is happening...? tom If Im understanding you correctly, I should look at the clutch first (but I'll check the other stuff if that doesnt seem to be it). I'll try to work on it this weekend and take a video. But the RPMs go up and up and up as I pull the throttle back, then they suddenly drop to where they belong and it takes off. |
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Post by mralice on Jul 10, 2023 16:36:22 GMT -5
If you put it up on the center stand, can you slowly twist the throttle and have the engine rpms increase at a reasonable rate? If the engine rpms follow the twist grip throttle, and raise/lower rpms as desired, then I would look at the CVT to see if it has some sort of assembly error. If the CVT hangs, the engine rpms go zoom zoom zoom and THEN all of a sudden, the CVT grabs and about yanks the scoot out from under you, I would look at the CVT, a hanging clutch, hard to move variator, or sticky torque spring/movable hub. I don't know all the legal names. If the rpms climb and you go nowhere, the clutch could be sticking and finally engage and take off. If that happens, the variator would be 'gearing' as you accelerate, with the rpms tending to stabilize as your speed increases. Need a closer description of what is happening...? tom This was the issue. I've been zooming around for the past 2 hours now :3 |
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Post by classacted on Jul 10, 2023 19:23:26 GMT -5
I'm sure you know that you have to take it easy during the 'break in period'. be ready to change the oil soon. experts say within the first 100 miles. you probably have close to that now driving for two hours.
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Post by aeroxbud on Jul 11, 2023 3:29:38 GMT -5
If you put it up on the center stand, can you slowly twist the throttle and have the engine rpms increase at a reasonable rate? If the engine rpms follow the twist grip throttle, and raise/lower rpms as desired, then I would look at the CVT to see if it has some sort of assembly error. If the CVT hangs, the engine rpms go zoom zoom zoom and THEN all of a sudden, the CVT grabs and about yanks the scoot out from under you, I would look at the CVT, a hanging clutch, hard to move variator, or sticky torque spring/movable hub. I don't know all the legal names. If the rpms climb and you go nowhere, the clutch could be sticking and finally engage and take off. If that happens, the variator would be 'gearing' as you accelerate, with the rpms tending to stabilize as your speed increases. Need a closer description of what is happening...? tom If Im understanding you correctly, I should look at the clutch first (but I'll check the other stuff if that doesnt seem to be it). I'll try to work on it this weekend and take a video. But the RPMs go up and up and up as I pull the throttle back, then they suddenly drop to where they belong and it takes off. That sounds like pretty much how scooter CVT systems work. The revs rise to a set level by the clutch springs. Then once the clutch shoes spring out and grab the bell. The revs should drop. I don't mean to sound like I'm getting at you. But this your first experience with a scooter? Have you ridden any other powered two wheeled bikes before for comparison? |
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Post by classacted on Jul 11, 2023 12:24:45 GMT -5
did you verify gear oil in the final drive? I bought a replacement engine and there was about three tablespoons in there. never trust that they put enough in.
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