NK Racing Honda CT125 (Trail125) 428 to 420 conversion set (RK Gold Seal Chain & FR Sprocket)

428 to 420 conversion set
The 428 size is over-spec for a 125cc engine capacity.
The Super Cub C125, GROM, and Wave125, which have the same engine as the Honda CT125 (Trail125) but higher output, use the 420 size.

The effect of downsizing from a 428 to a 420 chain is smoother acceleration and deceleration due to weight reduction. Acceleration improves, and braking becomes more effective. Fuel efficiency also improves due to reduced resistance. Of course, the top speed increases, and by using a sealed chain, the maintenance cycle is extended; the adjustment interval for a sealed 420 chain is longer than that of a non-sealed 428 chain.

Sprockets, front and rear, are included in the set.

Seal chain gold RK 420 KLO -120 (clip type)
Cutting is necessary as the chain has 120 links.
(The Honda CT125 (Trail125) has 108 chain links)

Sprocket 420-14 OSAKI
Sprocket 420-39

he 428 size is over spec for 125cc engine capacity.
The Super Cub C125, GROM, Wave125, etc., which have the same engine as the Honda CT125 (Trail125) but even higher output, are 420 size.

The effect of downsizing from a 428 to a 420 chain is smoother acceleration and deceleration due to weight reduction. Acceleration is better and braking is more effective. Fuel consumption is also improved due to reduced drag. Of course, the maximum speed is also increased, and the maintenance cycle is lengthened by using a sealed chain.

Sprockets, front and rear, are set to match.

Seal chain gold RK 420 KLO -120 (clip type)
CUT is necessary because the number of chain links is 120.
(Honda CT125 (Trail125) has 108 chain links)

Sprocket 420-14 SCORPION
Sprocket 420-39