I suspect the wire clipped hoses came off while I was changing the mains. They were definitely on last weekend! It's not like pulled hard on the carbs, I just removed them from the inlet rubbers and tilted them so I could remove the bowl/mains. If those clips are as good as you say then they shouldn't have come off. I never suspected they would either.

I then rode about 15 - 20 km before it siezed. When I figured out the problem, i.e blue flames + no smoke I checked the injector lines as that is the only reason as to why only one pipe was smoking. Reconnected the line, got it started and rode it home keeping it under 5,000 rpm.

Is there a way to tell if the crank is ok without pulling it out?
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MC21 Honda NSR250. TYGA 300 conversion.