Great upgrade for worn out roller weights of if you are just looking for more performance.
Dr Pulley Slider Weights were first offered by Scootrtronics in 2004 so we have lots of experience with them and suggest for all scooters.
They do not wear and get flat spots like round rollers.
They slide and no roll, smooth performance
Simply last much longer than stock roller weights
WE have found 7 and 8 gram to be the best for Kymco two stroke and 6gram for Kymco four stroke 49cc scooters.
The two stroke Kymco Super 8 and 9 plus the will get best performance with 8gram sliders. This is not the same as for the Zuma or other two stroke scooters that use 5gram as best performance.
The Kymco two stroke scooters use the same CVT parts as GY6 four stroke and Honda two stroke (Dio), so variator and clutch and same size as GY6 139QMB engines.