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- Mon Feb 26, 2024 8:51 pm
- Forum: Yamaha
- Topic: Rd400 engine or not
- Replies: 0
- Views: 551
Rd400 engine or not
Ok, so just had my engine rebuilt, number 1A1-100697, supposedly this was a 76400. Had 400 barrels on. Unit came back and, I’ve just measured the stroke of the engine and it’s 54mm. Rd400 stroke should be 64mm I’ve just checked my second 400 engine, same prefix 1A1 and it’s 64mm stroke. I checked th...