# Project Backlog ## Yamaha YL1 Twin Jet 100 — L1-47603 Milestones and success criteria are defined in [PRD.md](PRD.md). Item format follows [TODO_Backlog_Guide.md](YL1_Project_docs/Yamaha_YL1_Project/00_Best_Practices/Software_Docs/TODO_Backlog_Guide.md). --- ## Project / Documentation ### B-001 — Confirm PDF extractability **Priority:** Critical **Status:** Not Started **System:** Docs Attempt to extract text from `2Cyl2StrMan.pdf`. If text-extractable, pull all torque values, bore specs, jet sizes, and float heights and replace "verify from manual" estimates throughout best practices docs. If image-only, manually transcribe critical values. --- ### B-002 — Resolve Open Question: Autolube or premix? **Priority:** Critical **Status:** Not Started **System:** Engine / Docs Determine whether the Autolube pump is functional. If disabled or removed, write ADR-003 documenting the decision to run premix and update best practices docs accordingly. --- ### B-003 — Set up `.gitignore` **Priority:** High **Status:** Done **Done:** 2026-02-21 **System:** Project Create `.gitignore` at repo root excluding `*.jpg`, `*.jpeg`, `*.png`, `*.pdf`, `*.zip` from Git tracking. See RUNBOOK for the standard content. --- ### B-004 — Initialize Git repo and make first commit **Priority:** High **Status:** In Progress **System:** Project **Depends on:** B-003 Stage all current docs-only files and commit. Commit message: `20260221 Project — initial structure, best practices, PRD, CHANGELOG, BACKLOG, RUNBOOK`. --- ### B-005 — Annotate photo index **Priority:** Medium **Status:** Not Started **System:** Docs Update `photo_index.csv` with `date`, `system`, and `description` columns per the Documentation Protocol format. 16 photos currently have only filename and path. ### B-006 — Create retroactive work log from photos **Priority:** Medium **Status:** Not Started **System:** Docs Create a dated work log entry in `02_Engine_L1-47603/Work_Log.md` covering the Nov 2024 – Jan 2025 disassembly sessions. Use the 16 photo timestamps as the timeline anchor. Describe what is visible in each photo group and what state the bike is in. --- ### B-010 — Photograph current condition (complete set) **Priority:** Critical **Status:** Done **Done:** 2024-11-12 through 2025-01-10 **System:** Engine / General With bike in current state, photograph all systems before any disassembly: overall, engine externals (LH, RH, top, front), carburetor mounting, electrical routing, frame condition, wheels/tyres/brakes, instrument cluster. > 16 photos captured (PXL timestamps). Not yet annotated — see B-005. --- ### B-011 — Engine disassembly — top end **Priority:** Critical **Status:** Done **Done:** ~2025-01-10 (estimated from last photo) **System:** Engine **Depends on:** B-010 Remove heads, cylinders, pistons. Photograph each step. Record in Work Log. > Bike is substantially disassembled as of 2026-02-21. Work Log entry outstanding — create retroactively from photos. --- ### B-012 — Measure cylinder bores **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-011 Measure LH and RH bore at 6 points each. Record in Measurement Log. Compare to spec (confirm spec from B-001 first). --- ### B-013 — Measure piston OD and ring end-gap **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-011 --- ### B-014 — Assess crank big-end play and runout **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-011 Check big-end radial play. If cases need splitting, check main bearing condition and crank runout with dial indicator. --- ### B-015 — Disassemble and assess both carburetors **Priority:** Critical **Status:** Not Started **System:** Carburetion Full teardown per `03_Carburetion_and_Fuel.md`. Record jet sizes found. Assess float, needle valve, slide, and pilot circuit condition. --- ### B-016 — Assess ignition points and timing marks **Priority:** Critical **Status:** Not Started **System:** Electrical Check point condition and current gap. Verify timing marks are legible on flywheel and stator. --- ### B-017 — Inspect wiring harness **Priority:** High **Status:** Not Started **System:** Electrical Unwrap loom. Inspect for cracked insulation, damaged connectors, missing grounds. Photograph routing before any disturbance. --- ### B-018 — Measure brake drum IDs and shoe lining thickness **Priority:** Critical **Status:** Not Started **System:** Frame / Chassis Both front and rear. Compare to service limits. --- ### B-019 — Inspect frame welds and check alignment **Priority:** Critical **Status:** Not Started **System:** Frame / Chassis Check steering head, engine mounts, swingarm pivot. Dye-penetrant test if any questionable welds found. --- ### B-020 — Check tire age and condition **Priority:** Critical **Status:** Not Started **System:** Frame / Chassis Read DOT date codes. Replace if over 6 years old regardless of appearance. --- ### B-021 — Compile final parts list from assessment **Priority:** Critical **Status:** Not Started **System:** Project **Depends on:** B-011 – B-020 Consolidate all required parts into `02_Engine_L1-47603/Parts_Log.md`. Begin ordering Critical-priority parts. --- ## M2 — Engine Rebuild ### B-030 — Order and receive all engine parts **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-021 --- ### B-031 — Cylinder bore or hone (machine work) **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-012, B-030 --- ### B-032 — Split cases and replace crank seals **Priority:** Critical **Status:** Not Started **System:** Engine --- ### B-033 — Reassemble bottom end **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-032 --- ### B-034 — Reassemble top end (pistons, cylinders, heads) **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-031, B-033 --- ### B-035 — Rebuild both carburetors **Priority:** Critical **Status:** Not Started **System:** Carburetion **Depends on:** B-015, B-030 --- ### B-036 — Replace points, condensers, set gap and timing **Priority:** Critical **Status:** Not Started **System:** Electrical --- ## M3 — First Start ### B-040 — Pre-start checklist **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-034, B-035, B-036 Complete the First Start Checklist from `07_Break_In_and_Tuning.md`. All items must be checked before first start attempt. --- ### B-041 — First start and initial tune **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-040 --- ## M4 — Break-In ### B-050 — Complete 300km break-in protocol **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-041 Three phases per `07_Break_In_and_Tuning.md`. --- ### B-051 — Post-break-in service **Priority:** Critical **Status:** Not Started **System:** Engine **Depends on:** B-050 Re-torque heads, re-check timing and points gap, change Autolube oil/premix, read plugs. --- ## M5 — Project Complete ### B-060 — Verify all PRD success criteria **Priority:** Critical **Status:** Not Started **Depends on:** B-051 Walk through every checkbox in `PRD.md` success criteria section. --- ### B-061 — Finalize all documentation **Priority:** High **Status:** Not Started Ensure measurement log, parts log, work log, photo index, and CHANGELOG are all current and complete. --- ### B-062 — Final commit and tag **Priority:** Medium **Status:** Not Started **Depends on:** B-061 Commit all final documentation. Tag the commit `v1.0-complete` or equivalent milestone tag. --- ## Completed *(Items move here when Done, with completion date)*