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Post by rollingbender on Apr 22, 2023 13:15:16 GMT -5
Picked up this 2005 Yamaha Vino 125 for cheap. Cheap because it has a few issues.   The body is in ok shape. It’s missing the floor mat and the two lower trim pieces and one of the side panels is cracked but all there. It came with no keys so I took a big risk trusting the seller as to its ability to run. I took it to a key shop to have keys made. It started immediately!!! The seller said that it wouldn’t go…just rev up and not move. It doesn’t make any nasty grinding sounds when you turn the rear wheel so I suspected broken belt. After getting it home from the key shop I was able to start it and hear the nasty grinding sounds coming from the CVT and it does in fact try to move so now my suspicion is a variator that has done bad things. There was about 1” of exhaust pipe left on the flange to the motor so the first thing I have done is to make a new header. I was able to recycle some bent failed attempts at a seat frame on my Chinese scooter transformation build. A little tweaking of the bends and welding that to the stub that was there and now I have a straight through header. I will be adding a flange to the outlet of the header in order to attach a muffler. Next step will be to open up the CVT to determine exactly what is going on and get parts ordered. WOW!!! Parts are way more expensive for this than for a Chinese GY6! |
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Post by aeroxbud on Apr 22, 2023 13:52:58 GMT -5
Horrible grinding noises are sometimes the variator nut coming undone. If it is, hopefully it hasn't damaged the crank splines.
Let's hope it's an easy fix.
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Post by rollingbender on Apr 22, 2023 14:54:39 GMT -5
Horrible grinding noises are sometimes the variator nut coming undone. If it is, hopefully it hasn't damaged the crank splines. Let's hope it's an easy fix. In doing my research on this project, I’ve seen a few cases where the bushing allowing the moving side of the variator pulley to move in and out according to slider/roller position goes bad. Bad bushing heats up the pulley surface and melts the sliders/rollers and eventually shreds the belt. But…. Now that you mention that, another symptom it has could indicate loose or missing variator nut. The kick start does nothing. On this one, the cogs for the kick start are right behind the variator nut. Hmmmm.  ? |
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Post by geoffh on Apr 22, 2023 15:09:10 GMT -5
Hmm,scooter addiction in it,s infancy ,do we need to intervene?.it didn't help Milly and I still need my sponsor daily,let,s let it run for now  Geoff |
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Post by rollingbender on Apr 22, 2023 15:24:32 GMT -5
Hmm,scooter addiction in it,s infancy ,do we need to intervene?.it didn't help Milly and I still need my sponsor daily,let,s let it run for now Geoff I’ll be ok. I seem to do better when an addiction is occupying the creative part of my brain. Scooters are better than any substance that I know of. |
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Post by rollingbender on Apr 22, 2023 21:28:43 GMT -5
Just cut out and welded together this do-dad that will go on the end of the straight pipe so that a muffler of standard GY6 type can be bolted on.  |
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Post by rollingbender on Apr 23, 2023 15:06:45 GMT -5
Good news! I’ll be getting a Dr Pulley variator!!! Bad news😢 This choice was thrust upon me. I opened it up, the first part to fall out before even getting the cover all the way off was the nut. And, as luck would have it, it fell directly into my oil drain pan (full of used oil). I drained off the oil into another container and fished it out. I was a little perplexed at first. It has the appearance of a thick hexagonal spacer.  I’m pretty sure there are supposed to be threads in the bore of this part. I got the cover pulled and the next parts to fall out were the washer, the ratchet piece for the kick start and the fixed side of the variator pulley. Again, this part must be some sort of custom piece. I think these are supposed to have longer fins and a splined bore.  The other side of the variator is also hurting. The oil seal on the pulley side has lost its purpose and function and has begun to chew into the pulley. Threads from the nut were left behind on the crank threads. They peeled out like a spring. The threads on the crank seemed to have survived. The splines on the end of the crank are no longer perfect but I feel that with proper torquing of all the other parts that they will perform their duties in the future. So, now I order parts and wait. |
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Post by 190mech on Apr 23, 2023 15:18:55 GMT -5
You might have gotten lucky! Heard the Yam nuts are butter soft so the crank threads survive,,  |
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Post by aeroxbud on Apr 23, 2023 16:44:54 GMT -5
This is why I don't like using an impact to do up crank nuts. Seen it happen too many times.
A lucky escape. 👍
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Post by rollingbender on Apr 23, 2023 17:40:05 GMT -5
This is why I don't like using an impact to do up crank nuts. Seen it happen too many times. A lucky escape. 👍 I think this also gives me an opportunity to do something else that gives me joy… making a tool. The tool for holding the variator and/or clutch while setting the nut to proper torque looks to be a very easy build. Need something to do while waiting for parts anyway. |
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Post by aeroxbud on Apr 23, 2023 17:42:08 GMT -5
This is why I don't like using an impact to do up crank nuts. Seen it happen too many times. A lucky escape. 👍 I think this also gives me an opportunity to do something else that gives me joy… making a tool. The tool for holding the variator and/or clutch while setting the nut to proper torque looks to be a very easy build. Need something to do while waiting for parts anyway. Are they going to look as good as the ones Brent made? No pressure. 😉 |
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Post by rollingbender on Apr 23, 2023 18:12:39 GMT -5
The bar is set high!
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Post by jbjhillbilly on Apr 23, 2023 18:53:02 GMT -5
This is why I don't like using an impact to do up crank nuts. Seen it happen too many times. A lucky escape. 👍 “Oh, it’s fine. Ive done it XXX times.” Says everyone who it’s happened to. I’m all for ugga dugga, but not on the crank. |
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Post by rollingbender on Apr 23, 2023 21:04:11 GMT -5
Got all the parts ordered. $200 later, I have a Dr Pulley variator, new nut, and a new Kevlar Gates belt on the way. For a Chinese 50cc, these parts could have been replaced (with generic brand parts) for about $35.
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Post by rollingbender on Apr 24, 2023 7:23:28 GMT -5
[/quote]Are they going to look as good as the ones Brent made? No pressure. 😉[/quote]
I guess the pressure was too great. For $11.99 I ordered one off Amazon last night. I worked on the Chinese transformation instead. Sometimes, economics is the priority.
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