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Post by ellpee on Mar 22, 2013 19:33:06 GMT -6
Okay, so I just broke 1200 miles on my Roketa 250B, and I'm not very comfortable with how the drive train is working. From a standing start, the scoot often jerks and shudders like when you're teaching your teenager how to drive a stick shift for the first time. Grabs a bit, then releases, grabs again, sometimes the jerks are even enough to squeak the rear tire a bit. Lots of box'o'rocks noise associated with that behavior, too. Since this is the only scooter I've ever driven I have no basis for comparison, but surely this can't be normal??? Once I get it up to maybe 10MPH all is well, runs smoothly all the way up to 60mph (furthest I've dared so far), but this disconcerting rough stuff from 0-10 worries me. Is it in fact something that needs attention, and if so, where do I start?
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Sophomore
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Post by gatekeeper on Mar 22, 2013 19:50:10 GMT -6
Sounds like the clutch pads are glazed. When this happens it takes more force for them to get a firm grab on the clutch bell. This is a common occurrence. You can take the bell off and rough the pads up a bit with some sandpaper and it will smooth out for a while but it will come back again. If there is a more permanent solution I am not aware of it.
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Post by alleyoop on Mar 22, 2013 20:29:01 GMT -6
Yea this always happens with heavy scoots and folks babying them on take offs or going around at very low speeds. You can help it a little more by taking the clutch apart and greasing where the stud where the pad swivels on as well as the rubber rings that hold the pads when retracted so they pull off the rubber easier and swing out.
Alleyoop
Here is a Video on cleaning and greasing some of the points on the Clutch.
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Post by alleyoop on Mar 22, 2013 23:36:36 GMT -6
I don't know maybe they don't want to spend $50.00 bucks.
Alleyoop
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Post by richardthescooter3 on Mar 23, 2013 7:09:49 GMT -6
I learned my lesson breaking off a fin on my varaitor fan, so now I use a air impact wrench when working on the cvt and clutch area.
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Post by ellpee on Mar 23, 2013 8:39:42 GMT -6
"Yea this always happens with heavy scoots and folks babying them on take offs or going around at very low speeds. "
So how do I need to modify my driving habits to minimize this problem once I've fixed it for now? Sounds like you're saying I need to be less tentative/more aggressive when I start up from a standing start? As a new driver I admit I've tended to take it real easy at that point, both because of my own confidence level and because I didn't want to place excessive demands on what's basically a cheap scoot. Maybe it can take more than I thought?
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Post by richardthescooter3 on Mar 23, 2013 9:57:43 GMT -6
When taking off from a dead stop, just accurate with increasing your speed as you go, if you start out too slow that is why it jerking and shuddering, the another thing you can do which would help a lot is to install sliders instead of roller weights.
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Post by alleyoop on Mar 23, 2013 17:00:52 GMT -6
Take mine Trike it weighs 353 lbs and I weigh in at 180 and it is a 150 that is a lot to ask and I crank on that sucker the rpms come up to 6k and it moves it right out with no shuddering or jerking then once it gets the weight moving you can back off the rpms and settle it down to where you want it. But MAYBE DOING THIS WILL HELP: Alleyoop   |
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Post by ellpee on Mar 23, 2013 17:33:22 GMT -6
So, looks like I need to get at the clutch pads and rough 'em up a bit, after which I need to drive more like Alley. After reading a couple related threads and looking at some diagrams, it appears to me that involves pulling the CVT cover, which I've done before so no problem. Then, the clutch is inside that round gizmo (the "bell," I presume) at the rear pulley. If all I want to do is hit the pads with some rough sandpaper, is it going to be a matter of just removing the center nut and pulling off the bell cover, or am I going to have to remove the variator and belt and then pull the complete clutch assembly off entirely? |
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Post by alleyoop on Mar 23, 2013 18:27:13 GMT -6
Ellpee,
If you are just going to rough up the pads just take the bell off and no more.
Alleyoop
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Post by ellpee on Mar 23, 2013 21:28:50 GMT -6
Cool, that's what I was hoping for right now. If that "fix" doesn't last all that long I'll get more into it next time, including lubing things per your video. For now, hoping to get off easy.
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Sophomore
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Post by robert1c on Mar 24, 2013 21:07:39 GMT -6
Sounds like the belt maybe slipping. whenever i have to open the CVT i like to take the sandpaper and rough up the inside if the fan and the variator just to make sure there is no glazing. when i replace the clutch i did the same thing. hope this helps!!
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Post by ellpee on Mar 24, 2013 23:26:07 GMT -6
I'll look at that while I have the CVT cover off, but as far as the variator is concerned, I thought the idea was for the surfaces to be as SMOOTH as possible so the rollers and belt can slide freely as the pulley moves in and out (or apart and together, is maybe the better way to say it). Just read a thread, in fact, where somebody was talking about polishing the roller channels to remove any surface roughness.  ? |
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Post by justbuggin2 on Mar 24, 2013 23:51:48 GMT -6
yes you want the surface that the roller ride on as smooth as possiable but you want the surface that the belt to be rough enough to keep the belt from slipping
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Post by alleyoop on Mar 25, 2013 0:00:42 GMT -6
I disagree, they are supposed to be smooth, if you have black marks or build up from the belt then yes you take that off. I use degreaser on the pulley faces of the Clutch and Variator to take any grease or oily film off the surfaces.
If they were supposed to be rough they would not spend the time to smooth them out like a babies butt. If you rough them up it will tear your belt up.
my .02
Alleyoop
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..BAD TO THE BONE..
