nsrjb wrote:change the spark plug and clean out the carb and check the carb settings.

this should solve your problem.

the powervalve would only cause problems if it was stuck open, so check to see if powervalve servo moves when you turn on the ignition.

AHA! Power valve servo doesn't move when I turn on the ignition - wondered about that, as on my Cagiva Mito it would snap to attention when the ignition was switched on. Should the NSR behave similarly, or give other signs of life?

I cleaned & gapped the spark plug - it was fuel-wet, but had good tan color. The carb was cleaned out - by a Bangkok shop... so the work is suspect I'm leaning toward opening the carb up and cleaning out again - special attention to the cold-start enrichening circuit, but want to eliminate less labor-intensive possibilities first.

Coil & secondary wire are probably original, so could use refreshing. But since it runs well when warm, I'm thinking these aren't the cause of the cold start problem.

Really appreciate it guys!
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-bdb