Sliders

[BettinANDlosing]

Ahhh yes but you can always get heavy and grind down!!

[zombie]

I've tried that with little luck. Usually the core will start spinning inside the roller shell.

[BettinANDlosing]

Dremel tool and a gram scale.

[zombie]

I'll spend that hour... entertaining.

[JJJoseph]

I've tried that with little luck. Usually the core will start spinning inside the roller shell.

Wrong tool. If you use a Dremel with a narrow rasp bit, you can adjust the weights quickly & quite accurately.  Use a pocket electronic scale (about $8 on eBay).  This is much cheaper than buying a lot of weights because you can recycle surplus weights.  You only need to go through the exercise once because it's real obvious when your weights are too light. 

[Yager200i]

Yes, sliders *will* act lighter than the equivalently weighted rollers. So for smaller scooters, go 1 gram heavier. For mid-range scooters, go 2 grams. For bigger scooters, 3 grams.

On mine, the heaviest Dr. Pulley manufactured were 16 gram sliders, but the OEM rollers were 17.5 grams. So the sliders put me into the rev limiter WAY too easily.

I used Liquid Metal to fill in the centers of the sliders, which increased their weight to 18 grams (actually, 18.03 grams, 18.05 grams, 18.05 grams, 18.05 grams, 18.06 grams and 18.06 grams), and now they feel equivalent to the rollers. I'll lathe up a set of heavier weights some time in the future, as it's still too easy to hit that rev limiter.

One trick for sliders... use extra fine (FF) emery cloth to polish the variator tracks where the sliders slide, then get some very thick, very high-temperature grease (I use a synthetic grease that guaranteed on the package that it wouldn't run up to 600 F) and put a very thin coat on the outward facing edges of the sliders, and in the variator tracks where the slider slides. Buttery smooth action out of the variator when you do that, and it appears to make the sliders act more like a similarly weighted roller.

[BettinANDlosing]

Oh snap bringing it back old school, all the old Hondas have the variator FILLED with grease, huge sinking mess lol. Not sure who at Honda decided it would be a good idea to literally full the variator with grease. I've never had to go 3 grams heavier with Dr pulley sliders tho that's crazy.

[Yager200i]

Well, that's assuming you want it to upshift a bit more quickly. I was trying to get it to go to the highest gear ratio at as low an engine RPM as possible (like my old scooter did), for a lower engine speed under around-town cruising conditions.

Not quite there yet, it starts variating at about 5000 right now if I'm light on the throttle. About 7000 if I'm heavy on the throttle. Coming home from work, right out of the parking garage, there's a long stretch of road that's got a 25 MPH speed limit. I set the RPMs to 5000, and if I hold it there, it'll creep up to about 35 MPH. From 5000 to 6000 RPM, it goes from 35 MPH to 53. I can cruise at 60 MPH at 6500 RPM.

When it hits 7000 RPM, the engine takes on another persona, it seems to come alive a bit, gets a surge of power. WOT from there will launch me up to about 78 MPH if the weather and humidity is just right, but I'm running right at the ragged edge of the rev limiter there. If everything is *just* right, I have to back off to about 3/4 throttle to maintain 8000 RPM, but usually about 7/8 throttle will do it. Typically it'll easily take me to 75 at WOT even if the weather's not just right, but I don't like riding there, as I have to keep looking at my RPMs to be sure I'm not gonna hit the rev limiter.

I think for me, 20 gram sliders and a slightly taller rear gear will work pretty well. But I did a hard break-in of the engine to better seat the rings to get more compression, and I've put the Ceratec in for three oil changes. So it's got excellent compression and more power than gears.

Another thing I wanted to try was a suggestion by MotoRandy... shaving down the variator boss width by a millimeter or so, to try to get a higher gear ratio... not sure if that'd work, so I'll order a new boss, and play around with the old one.

Anyone have any idea where to order new (higher gear ratio) rear gears for a 2010 Kymco Yager GT 200i?

[BettinANDlosing]

Gears might be a hard find for that bike without ordering some made for another bike  and testing yourself. I've had luck grinding down the boss mm at a time. It didn't always lower the great ratio however. The Dr pulley variator comes with shims to adjust. What I've found with boss length is it will obviously raise the lowest and highest "gears" on the scoot adding a bit of top speed if the motor can pull through the wind resistance but will sometimes suffer off the line. It also changes the characteristic of the variator through its operating range. Tuning my Dr pulley boss length I actually found that less washers (shorter boss) actually made the engine rev HIGHER on normal use, IE: cruising at 20mph then give it wot throttle no spacer constant 8500rpm, with spacer 8000rpm. Note that the Dr pulley spacers are 1mm.

[de dee]

   I ride a 300i downtown,  I did not touch the boss, I shaved the inside face of the variator, where they touch, to make the variator narower and that lowered my rpm. 500 to 1000 rpm at differant speeds, to shave it down I used a belt sander it took a few seconds on each side to shave it off measured by the hole of the boss,  1/2 mm off each side of the variator,