Shark RV50 Secondary Axle Drive SprocketFUN:BIKESShark 50 Secondary Small Axle Drive Sprocket
Not the engine sprocket, but the next one on the upper inner chain loop.
The second Small sprocket in the drive system.
13 Tooth, 06b pitch.
Number 32 in image https://www.funbikes.co.uk/p6914_shark-rv50-secondary-axle-drive-sprocketP6914-V75751010200050G0C0
Shark 50 Secondary Engine Drive SprocketFUN:BIKESShark 50 Secondary Engine Drive Sprocket
Not the engine sprocket, but the next one on the upper chain loop. The second sprocket in the drive system.
30 Tooth, 420 pitch. https://www.funbikes.co.uk/p5828_shark-50-secondary-engine-drive-sprocketP5828-V6440PC52CC3A