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1968 Yamaha YAS1C Rebuild & Recommission – PART 2 | Full Engine Rebuild, Wiring Fix, First Start!

In FINALE Part 2 of our 1968 Yamaha YAS1C restoration series, we dive deep into the heart of this little two‑stroke survivor. After discovering the engine was full of water and the wiring was a complete bird’s nest, it became clear this old girl needed far more than a quick tune‑up… so today, we finish the full bottom‑end rebuild, tackle the carbs, sort the electrics, and finally try to bring the YAS1C back to life.

In this episode you'll see:

• Vapor‑blasting and rebuilding the crankcases
• New bearings, seals, and a fully rebuilt crankshaft
• Reassembly of the gearbox and clutch
• Restoring and refinishing the carbs
• Fixing burnt and miswired electrical connections
• Setting ignition timing with a dial gauge and test light
• Sealing the fuel tank with a Caswell liner
• Reinstalling the engine and prepping for first start
• AND… the long‑awaited moment: firing up the resurrected YAS1C for the first time in decades

Watching this neglected two‑stroke transform from a seized, leaking water filled mess into a running machine again is incredibly satisfying. Whether you're restoring your own vintage Yamaha or just love seeing old bikes saved from the scrap heap, this episode is packed with hands‑on engine work and vintage‑bike goodness.

If you’re enjoying the build, don’t forget to hit Like, Subscribe, and follow along for the next project!