Bridgestone 90 - Carburetor System; Carburetor Construction and Operation

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Fourth Gear:
The third Gear B remaining in position, the Second Gear A slides to the left and the dog teeth engage with
the Fourth Gear A.
The engine power is transmitted in the order of driven gear-clutch-countershaft-Second Gear A-Fourth
Gear A-Fourth Gear B-driveshaft and drive sprocket.
Fifth Gear:
The Fifth Gear is engaged with driveshaft by shifting "Sportshift" lever.