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For those who have trouble driving at high speeds ...
I bought it because the maximum speed is a heady 114km and I was wondering if it could be a little more.
Spring replacement was a hassle, so I kept the OEM Clutch Side and replaced only the Pulley Side, which gave me 120km on level ground and +10km if I tried hard. (*Speed based on Meter reading)
The OEM weight roller may have been worn out, but the mid-range acceleration is no longer sluggish, and the car feels as if it turns from bottom to top without any stress.
I was expecting a drop in fuel economy, but I am very happy with the overall results, as I am getting about the same mileage when I commute to work as I did before the replacement.
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Koso power kit
Installed this kit on my 2022 honda adv 150 US version and man, it was what my bike needed. It comes alive at takeoff and doesn't stop till i hit the rev limiter. This is better than the S23 brand they sell here in the USA. 16 gram rollers is spot. View detail
You can feel the acceleration improving.
Weight roller17g(-3g)Center boss−I was riding with 0.5mm Spec. but I decided to incorporate KOSO's PowerKit because the rpm during shifting was at 6000rpm, a little lower than the delicious rpm.
Pulley is 2mm larger in OD than OEM, 126mm larger, and the gap with the case is only 4.5mm. 16g weight roller is 4g lighter than OEM. The center spring is spec'd at +1500 rpm. I think it means that the gearshift speed will be 1500rpm higher.:I measured the Set pressure and found it to be 42 kg, 4 kg higher than OEM. Free length is 133mm, 9mm shorter than OEM.
The gearshift rpm is now 1500 rpm higher than the Spec. In the Zero acceleration test, it was 0.2 seconds faster up to 20km, 0.4 seconds faster up to 40km, and 1.1 seconds faster up to 60km, and I feel it is much faster. Acceleration from AxelOFF is also good.
I had heard in advance that the maximum speed would drop even if acceleration improved, so I checked the maximum speed as well:the speed increase became worse after 100 km, and even worse after 105 km, but finally it reached 115 km, which was only about 3 km less than before the conversion. However, before the conversion, it was accelerating smoothly up to 110 km.
I am planning to add a Sports Clutch, so I will try to see if the acceleration past 100km/h can be improved a little more at that time.
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Listing photos and Included Parts:List.
I'm very disappointed that the pictures on the website and the items on the product list have changed quite a bit ^^;
Clutch Spring is Quantity:It's not in the set, and the weight roller is 15g in the list and 16g in the box....
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