Tuning HiT Clutch – Road Test
- Original Variator
- Original Ramp Plate
- Original Boss
- Original Fan
- Original Torque Spring
- Sliding Roller Weight, SR1814-6, 16g
- Original Driven Pulley
- Original Clutch Bell
- Original V-Belt
The road for the riding test is beside a windbreak forest, which is not affected by the weather and wind, the only disadvantage is that the distance is not long enough.
Kymco Famous 125c.c
Vehicle weight is 110 kg (243 lb)
Additional load is 130kg (286 lb), equivalent to about 20 degrees of climbing or headwind of grade 4~5. Why choose this weight? Because sometimes it takes adversity to better discern whether a horse is good or not.
Tire pressure is 28 psi.
Tire pressure will affect acceleration so we need to maintain the tire pressure of 28 psi for all testings to avoid any error due to tire pressure variation.
All test conditions are the same, only the clutch is different.
What to test? And what is the difference ?
Test the acceleration time needed to reach distance: 402 meter (1/4 mile)
Dr.Pulley, HiT Clutch, HiT181401 will test the following three specifications of Pillow Springs.
PS 11 kg, PS 20 kg, PS 25 kg, each test 5 times to get the average value.
The original clutch is tested 5 times to get the average value.
Both Clutches Engaged RPM are 1550.
To understand the detailed mechanism of HiT clutch, the official website link is attached below for first-time users’ reference.
Primary film begins
HiT181401, Pillow Spring 25 kg
HiT181401, Pillow Spring 20 kg
HiT 181401, Pillow Spring 11 kg
Summarized Comparison (Conclusion)
|Average data||Original clutch||HiT181401|
PS 11 kg
|0~50 km/hr||7.0 sec||6.3 sec|
|0~80 km/hr||23.7 sec||22.4 sec|
|0~402 m||23.8 sec||23.4 sec|
Actually, during this testing period , we not only have tested PS springs, but also CS springs. For the Kymco Famous 125 scooter and a carrying load of 130kg, the test results were classified into three levels. The following are provided for reference.
1550 rpm, 11 kg
1550 rpm, 20 kg
1360 rpm, 20 kg
|<Best combination>||HiT Clutch|
1550 rpm, 25 kg
1650 rpm, 20 kg
1360 rpm, 11 kg
1360 rpm, 25 kg
|*Rpm mean engaging RPM||HiT Clutch|
1650 rpm, 11 kg
1650 rpm, 25 kg
|*KG mean Pillow Spring||Original Clutch|