# seadoo-gtx-di-2001

**Equipment:** 2001 Sea-Doo GTX DI (951cc 2-stroke, air-assisted DI)
**HIN:** `ZZN39747A101` (verified MI registration 2026-04-28)
**Engine family:** `1BCXM.9514CD`
**Owner location:** Commerce Township, MI

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## Current state

**Status:** winterized on trailer, awaiting pre-launch diagnostic
**Latest guide:** [seadoo-gtx-di-2001-service-guide-v0.1.html](../../guides/seadoo-gtx-di-2001/seadoo-gtx-di-2001-service-guide-v0.1.html) (draft, 2026-04-28)
**Latest handoff:** [seadoo-gtx-di-2001-2026-04-28.md](../../handoff-blocks/seadoo-gtx-di-2001-2026-04-28.md)

**One-line state:** Power-loss diagnostic ranked 6 hypotheses against ~25-hour-rebuild context; nothing executed yet; next session opens DHL-002 with scan results, plug colors, compression numbers as findings come in.

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## Session history

| Date | Session outcome | Deliverable |
|---|---|---|
| 2026-04-28 | v0.1 guide shipped against METHODOLOGY.md v1.2; HIN canonically verified; engine family resolved (DHL-001 retroactively captured 4-TEC supercharger wrong turn) | v0.1 guide + DHL-001 + handoff |

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## Diagnostic logs

- [DHL-001 — Engine family identification](../../guides/seadoo-gtx-di-2001/diagnostic-logs/DHL-001-engine-family-identification.md) — converged: 951 DI 2T, MY 2001
- DHL-002 — Power-loss hypotheses (to open at next active session)

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## Outstanding for next session

- DTC scan
- Plug color comparison between cylinders
- Compression test, both cylinders
- Air compressor audible check
- Resolve all `// UNVERIFIED` items in v0.1 via service manual access
- Rebuild documentation hunt (receipts, parts list, rebuilder identity)

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## Related artifacts

- Photos: HIN plate, EPA label, seat tag, MI registration screenshot — held in chat context, not committed (per session 2026-04-28 routing decision; revisit if cross-session photo references break)