Yager Rollers 16 gm or 17.5 gm?

[MotoRandy123]

  I'm looking to get some Dr Pulley sliders for the Yager and they recommend going 1 gm
less than the stock weights. I don't have anything accurate enough to weigh them. On a
German thread they said 17.5 gm for the originals but I have heard 16 gm too. Anyone
know for sure? The official Dr. Pulley source (Buggy Parts store) only shows 16 gm sliders
which would be fine if the orignals are 17.5 but you would want 15 gm if they are 16 to start...

[mrmike]

  My wife does a lot of sales on E-Bay, so we have a small postage scale. If you don't have one, go to the Post Office and ask them to weigh them. If you have to, put all six of them in a envelope and just divide the combined weight by six.

[ludo]

What about the size of the OEM rollers?
That would be useful for reference.

Regarding the weight, I was going to recommended the same thing.
Some Post Offices have self postage machines. Weigh all of them and divide by the number of rollers.

Good luck and let us know if the Dr Pulley sliders help.
I would like to add them to lower the RPM on top speed.

[MotoRandy123]

 Well mine are not stock weight anymore, I tried adding weight, then removing weight,
then adding some back, so who knows if they are even close to stock.

 The stocker's are called 20 x 15 (they may be 20 x 14.8 in real life) and I thought they were
speced at 16 gm in this forum somewhere. I did order the sliders at 16 gm as I prefer a calmer
engine. Though some report no difference with stock weight and better acceleration and top speed
with lighter ones. It's weird that most of the Yager's contemporaries use lighter rollers (12 - 14 gm).

 I won't get a chance to try them until spring though. We have 8" of snow here and more on the way!

[ludo]

Thanks!
Sucks for the snow... :-(

[Yager200i]

I think this is the German site you were referring to:
http://www.kymco-ersatzteilshop.de/index.php?cat=3557&pos=22121-LEA5-E00

It says they're 20x15 at 17.5 grams.

{UPDATE 14 May 2013}
I just got an email back from Dr. Pulley, they claim the weight of the rollers in the Yager is 16.5 grams.

{UPDATE 17 MAR 2014}
I just bought a digital scale that's accurate to 1/100th of a gram. Our OEM roller weights are 17.5 grams.

[MotoRandy123]

I put the 16g sliders in but didn't like them. I had modded my variator to get a wider range of ratios
on the stock setup (but it didn't do much) and the sliders would rev to 9000 RPM's! They held a higher
rev at cruising speed too so I went back to stock. Anyone want to buy some slightly used sliders?

[Yager200i]

Yeah, I'm going to order the 20 gram sliders directly from Dr. Pulley in Taiwan. My wife's in Taiwan right now, so she can go pick them up, and ship them to me. If 20 grams is too heavy, I'll drop to 18 grams and see if those work.

[vespa50sp]

  My wife does a lot of sales on E-Bay, so we have a small postage scale. If you don't have one, go to the Post Office and ask them to weigh them. If you have to, put all six of them in a envelope and just divide the combined weight by six.

This works, or pretend that the rollers are bananas at the grocery store.

[modmaster]

Yager 200i, Did you ever get to try the 20 or 18 gram sliders you said your wife was going to buy? If so how did they work out?

modmaster

[Yager200i]

Yager 200i, Did you ever get to try the 20 or 18 gram sliders you said your wife was going to buy? If so how did they work out?

My wife went to Dr. Pulley in Taiwan, and they told her they no longer make custom weighted sliders. I got the idea to order direct from them, from them... their website said if you wanted to order a different size or weight, to contact them, but apparently that's changed.

So I'll order the heaviest they've got for our scooter (16 grams), and fill in the center with epoxy or something to increase the weight a bit.

[MotoRandy123]

I modded mine with epoxy and they went from 16 gm to 17.8.
I haven't tried them yet...

[Yager200i]

I might make a metal plug for each one that fits snugly inside the metal tube of the slider, then epoxy that in... I'd be able to weigh each slider, add the weight of the metal plug, and estimate the weight of the epoxy, to balance them all out. If any of them are heavier than the others, I can drill very tiny holes through that metal plug until the weight is the same as the others.

Another way I was thinking of doing it was:
Put each slider in boiling water to make the plastic pliable.  Slip the plastic off the metal tube, then heat up the metal tube to a couple hundred degrees and cool off the metal plug to freezing to cause thermal expansion (metal tube) and contraction (metal plug). Of course, I'd have to be within a couple thousandths of an inch of a perfect fit to begin with, but I can do that on the lathe. When everything cooled down / warmed back up, it'd be a tight fit, locked together. Then boil the plastic part again, and press the metal tube back in with a Dake press. That'd do away completely with the epoxy, allowing me to weigh each piece and custom grind the metal plugs to ensure each slider is exactly the right weight.

[MotoRandy123]

Um why not boil them and remove the core then make new solid cores and stick those in the plastic?

[Yager200i]

Yeah, I suppose I could do that. I'd have to experiment a bit to get the weight just right, and I'd have to polish the outer surface of the weight so it didn't tear up the plastic as I was pressing it back in, but that wouldn't be too hard.

I was hoping to make something were I could press the old weight out and a new one in just by putting the slider into boiling water to expand the metal tube, then putting the slider into a Dake press. In that way, I could experiment with different weights to find the best one, without having to remove the plastic each time.

Another idea I had was to make a rubber stopper arrangement, with an identical weight on each side of the stopper. It'd have a bolt going through it, with a union nut on the other side with a head on it. Tighten the bolt, it squeezes the rubber stopper, and locks the weight into place inside the metal tube. To put a different weight in, just loosen the bolt, remove the assembly from the metal tube, unscrew the bolt from the union nut, slide off the old weights, slide on the new ones, and reassemble.