Gearbox for motocross motorcycle B (Lifan?)

Gearbox for motocross motorcycle B (Lifan) — two shafts with gears: the drawings show a 121 mm shaft with 24z, 21z, 17z and 12z, and a 115 mm shaft — with 34z, 29z, 26z and 23z (z — number of teeth). Compare against your old shafts before ordering.

• The gearbox gears sit on these shafts: for each gear a different pair of them transmits the rotation.
• 121 mm shaft: splined end "6 frez", Ø 17 mm, other end Ø 12 mm; gears 24z — Ø 46 mm, 21z — Ø 41 mm, 17z — Ø 34 mm, 12z — Ø 26 mm, with a Ø 40 mm collar between them.
• 115 mm shaft: splined end "6 frez", Ø 20 mm; gears 34z — Ø 64 mm, 29z — Ø 56,5 mm, 26z — Ø 49,5 mm, 23z — Ø 44,5 mm, collar Ø 36 mm.
• From the splined end to the first gear, 38,5 mm is marked (on the 121 mm shaft) and 36 mm (on the 115 mm shaft); the drawings also give the gear widths.
• On the 115 mm shaft's drawing there's an arrow at the other end, but no number next to it.
• The photo has neither forks, nor a shift drum, nor bearings.

What we don't know, we don't write. Lifan is given in brackets in the name, but which Lifan engine and which motocross motorcycles these shafts are for isn't stated, and we don't guess that. Before ordering, count the teeth on your own shaft gears and measure the length of both shafts, send a photo of the old parts — we'll check before you order.

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