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Post by tiny on Sept 8, 2014 13:12:20 GMT -5
Hello all. New to your boards but bin scooting for years.
To the issue at hand. I bought a 2001 Yamaha Vino 2-stroke while driving it home I noticed that it was badly in need of a new belt and rollers. Easy fix right, while not so much. Before replacing the belt it got up to 62KPH(38MPH) after the belt 72KPH(45MPH) with the old rollers. Replaced the old rollers with new OEM rollers now it will not go over 40KPH(25MPH)!
On the clutch is a set of red springs that are really stiff to move. If I replaced that with the OEM spring should I be able to get back up to over 65KPH(40MPH)?
thanks y'all
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Post by oldgeek on Sept 8, 2014 13:31:23 GMT -5
 Greetings! The clutch springs should not affect you top speed. It is kind of strange how your issue unfolded. I wonder if the variator is stock, or possibly replaced? If the new rollers weigh the same as the old ones, I am not sure what is up. Possibly you should check to see that everything stayed in place during reassembly. I am sure someone here can help you though. |
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Post by tiny on Sept 8, 2014 13:45:25 GMT -5
Yes i do believe the variator is stock.I disassembled and reassembled it twice just to make sure.
AS to the rollers that I took out they were so flat spotted and used up that it was hard to get a weight measure on them. The readings that I got were 2,4,5,5,6,6 Grams the OEMs are 7 grams.
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Post by oldgeek on Sept 8, 2014 13:53:44 GMT -5
That is quite a wide range, and might explain you loss of top end after installing heavier weights. Try some lighter weights in there. I also have a 2T VINO, they are a blast!
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Post by oldgeek on Sept 8, 2014 13:57:24 GMT -5
I am not one to push brands, but I put a dr pulley variator in mine, and it has been awesome!
Hoca makes a very nice performance variator also that uses 16 x 13 weights and costs about 1/2 the price.
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Post by moofus02 on Sept 8, 2014 23:34:11 GMT -5
Yes i do believe the variator is stock.I disassembled and reassembled it twice just to make sure. AS to the rollers that I took out they were so flat spotted and used up that it was hard to get a weight measure on them. The readings that I got were 2,4,5,5,6,6 Grams the OEMs are 7 grams. You had about 28 grams of weights. 5 grams would put you at 30. Close to what you had. Sent from my SPH-L720 using proboards |
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Post by forkyleigh on Sept 9, 2014 13:45:56 GMT -5
Are you sure you reassembled it correctly? Was there a washer by the drive boss? Heavier weights shouldn't restrict his top speed that much should it? With heavier weights it may just take a long time to get there??
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Post by tiny on Sept 10, 2014 11:09:43 GMT -5
yes everything was reassembled correctly. Before I installed the OEM rollers I bought the wrong size aftermarket rollers (16x13 OEM are 15x12)with the belt. Installed the belt with old rollers in variator was still able to hit max speed of 73KPH(45MPH). After installing the OEMs I can till reach 70KPH(41MPH) but as soon as I stop for a light or wait for a turn it will not go past 40KPH(25MPH). Feels like it will not come out of first gear so to speak.
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Post by 90GTVert on Sept 11, 2014 16:19:08 GMT -5
 I agree that the roller weight could be the issue. Heavy rollers are often misunderstood to be a universal source for more speed, but really they need to be within some suitable range to let you reach top speed. Too heavy and RPM will be below peak and you'll struggle to pick up speed or reach normal top speeds. Too light and RPM will increase beyond peak and you may take off quickly, but revs will surpass any usable range at low speeds and it won't want to pull to higher speeds. A stiff contra spring has a similar effect to light rollers and raises RPM. A soft contra spring will lower RPM. When some people say clutch springs they only mean the actual clutch springs... the three springs that control clutch engagement. Others refer to the large contra/torque/main spring that is between the clutch and rear pulley as part of the clutch springs. That's the one I'm calling a contra spring and if it has been replaced with a red spring it may be too stiff or require heavier rollers to work with it. If RPM is too high, consider heavier rollers or a softer contra spring. If RPM is too low consider lighter rollers or a stiffer contra spring. I prefer to tune with rollers or sliders and leave the contra spring to stock or a 1000RPM (usually blue). Ultra stiff contra springs make CVT services unnecessarily difficult. |
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Post by tiny on Sept 12, 2014 17:40:29 GMT -5
All four springs in the clutch unit are red. Also I went to my local Yamaha Parts counter and ordered a new OEM contra spring(Yamaha calls it a torque spring) hoping that will cure what is wrong with it.
I'm not lookin' for outright top speed just reliability. I'm use to doing 66KPH on my '89 Honda Elite R(SE50) and the Vino is for my wife to use when we go out riding together as she can't keep up on our '88 Jog. And before anyone asks I own four scooters an '88 Jog, '89 Honda Elite R, ,01 Vino and a '13 Kymco Movie 150.
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Post by Elektrey on Sept 12, 2014 19:35:09 GMT -5
nice scooters!  If it seems like its stuck at 25mph check the RPMs. If the RPMs are low it may mean that your weights are too heavy and cannot get past a certain gearing. If they are very high it may mean that your weights are too light. The aftermarket contra spring can change what kind of rollers it likes for certain gearing. |
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Post by tiny on Sept 12, 2014 21:10:02 GMT -5
Thanks that is what I am presuming. It feels like the spring is not engaging all the way even at WOT especially after stopping. But it will have to wait till I get the new OEM spring in and at the moment it is on back order who knows when it will get in?
I might replace the whole of it with one the variator kits that I like and they come with a variator/backing, rollers and a Contra spring.
But that is a project for later as I am currently prepping my '88 Jog for a 900KM(560Mile) 24Hr rally thatvruns every two years.
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Post by 2TDave on Sept 12, 2014 21:15:57 GMT -5
Try cheapcycleparts.com for oem parts. Less money and all original oem parts.
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Post by tiny on Sept 13, 2014 9:05:09 GMT -5
Thanks I know of and used cheapcycleparts.com. But when a part is $15.00 paying an extra $45-55 to ship it up to Canada just doesn't make sense to me.
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Post by tiny on Oct 7, 2014 15:16:22 GMT -5
Update I got my OEM Contra spring last week and I finally had the time to swamp it into place. Acceleration is a tad slower with the OEM compared to red aftermarket spring but still got up to 66KPH(40MPH). Bad news is that when I stop to make my first turn like last time it will only go to 42KPH(26MPH) now. A little faster then before (2KPH/1MPH)but still same problem.
Okay so its not the contra spring. Now my attention turns to the rollers because this whole situation started after I replaced the old worn out rollers with new OEM rollers.
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