Dr.Pulley sliding pieces SP2318-J
Often they are forgotten, but the sliding pieces in the variator are equally important as the rollers. In these sliders, the pressure plate moves constantly up and down. The guides should not jam, but certainly the clearance should not have too much. It is highly recommended to change the sliders to coincide with the rollers.
The sliding pieces are made of a similar abrasion-resistant nylon as the Dr.Pulley rollers, which promises a long life.
Honda Pantheon 125i injection
Kymco Xciting 250
Kymco Xciting 300
Kymco Grand Dink 250
Kymco People 250
Added these as well as a BMC racing air filter to my honda sh300i scooter and performance has approved across the range. Acceleration off the lights has improved substantially. The bike feels about 15% quicker overall since this installing these rollers.
Just installed these yesterday and, in combination with the Dr Pulley rolls, the scooter (Honda 300 SHi) performs much better in comparison to the original Honda rolls and sliders (that I just installed a few months ago, so they were also quite new).
I put these sliding pieces into the variator of a Honda SH300 at about 2,000 miles, along with 17g weights (original weights being 19g). After inspection at 10,800 miles (checking for belt wear), I noticed that these sliding pieces had all cracked, and one had a chunk completely missing. I replaced them with the original Honda pieces.
So the main thing to be aware of is that these pieces don't last very long. I'd advise inspecting the pieces at least every 6000 miles, possibly even preemptively replacing them rather than waiting for damage.