Need help identifying this gear set
Need help identifying Yamaha TZ250 3YL / 4DP / 4TW gearbox ratio kit, applications, and value this is my best guess based on lits of Ai searching.
Hey everyone, I’m looking for help from people who know Yamaha TZ / GP bike transmission parts.
I picked up a large lot of motorcycle gearbox parts in a trade deal. I’m mostly a car/Subaru guy and don’t really know the motorcycle racing world, so I’m trying to properly identify what this is before I list it for sale.
Based on the markings, tooth counts, and Yamaha-tagged small parts, it appears to be a Yamaha TZ250 3YL / 4DP / 4TW gearbox ratio gear/shaft lot, possibly for the 1991–1999 TZ250 GP bikes. I’m not 100% sure if this is a factory Yamaha kit, optional ratio set, mixed spares lot, or a specific race gearbox ratio kit.
I’m hoping someone can help confirm:
Exact application / year range
Whether this is genuine Yamaha, kit gearbox, aftermarket, or mixed spares
Which ratios/gears I actually have
Whether this appears complete as a useful lot
Fair market value if sold as a lot
Parts and markings I’ve counted so far:
\- 1B / MF1B — 32T gear
\- 2B — 29T smooth-bore gear
\- 2F — 27T smooth-bore gear
\- 3B — 24T smooth-bore gear
\- 3F — 23T smooth-bore gear
\- 47-SPB — 27T smooth-bore gear
\- 98-5PD — 21T smooth-bore gear
\- 6E / PINION — 23T smooth-bore gear
\- 3YL-6WE — 20T gear with 6 internal dog pockets/splines
\- 4YL-6WB — 25T gear with 6 internal dog pockets/splines
\- 3D 4C STANDARD 3RD AND 4TH — compound gear, 21T + 25T, 6 internal dog pockets/splines
\- 3F4D — compound gear, 20T + 23T, 6 internal dog pockets/splines
\- 3B4C — compound gear, 18T + 25T, 6 internal dog pockets/splines
\- 47-3D4DP — compound gear, 21T + 23T, 6 internal dog pockets/splines
\- 3YL-B shaft — threaded section, 13T, 15T, 6 external dogs
\- 1C shaft — threaded section, 13T, 15T, 6 external dogs
\- Unmarked shaft — threaded section, 13T, 18T, 6 external dogs
\- 1F shaft — threaded section, 13T, 17T, 6 external dogs
\- 935 shaft — threaded section, 6T, 6 external dogs, solid shaft/not hollow internally
\- Assorted shims and C-retainers
\- Yamaha-tagged small parts:
\- 99009-20400
\- 93440-25084
\- 93310-22057 Yamaha needle bearing
The parts look like used race gearbox ratio spares, not a complete assembled transmission. I’m not trying to misrepresent it — I’d rather identify it correctly and sell it to someone who actually needs it.
Any help confirming the exact kit, applications, ratio info, missing pieces, or realistic value would be appreciated. I can take more photos or measurements if needed.