It had BR8ECM spark plugs that are probably a bit hot for Sydney conditions, i bought it from a country town where there winters are much colder. cold days here are 15 C, there it can be lucky to get over 10 in winter.

The air temperature has nothing to do with what temperature range the spark plug should be, its determined by the internal temp. in the cylinder.

The ambient temp. for a cylinder is around 50-60 degrees C and is determined by the cooling system, which keeps the cylinder at a constant temp. at air temp. between 0-35 C.

Internal temp. in the cylinder is aroung 7-800 C and is determined by: way of use, octane rating of the gas and degree of tune.

The normal NSR should use BR9ECM and at least octane 95, a tuned might use BR10ECM, so the BR8 and the 91octane could be the reason for the seizure.

Air temp. does however influence the mixture ratio, but thats another story.
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom