Welcome Kymco Owners!
Best thing you can do for a Yager. Get one of these:https://scooterpartsco.com/kymco/kymco-yager-200/malossi-variator-for-kymco-and-sym-scooters?zenid=e345232f79d5076a72cd1c216f5754e9Comes with 2 sets of rollers 9.5 and 13.5 gr., both are way too light for normal street riding. I ordered 17 gr. which for me were just right. I've tested both stock and 3 different weight Malossi's on my secret dyno test facility. Acceleration numbers for 1/8th mile are:stock ......13.14 sec. @ 6412 rpmMalossi W/9.5 gr.....12.20 @ 8740 W/13.5 gr......12.26 @ 7921 W/17 gr. .....12.63 @ 7243The Malossi with 17gr. rollers yields a solid 1/2 second improvement in 1/8th mile times. Stock rollers are a odd size, 20.8 dia x 15 wide at 17.5 gr.