Just to add, you sounded suprised in your first post when you said that the temp "even creeped up at the traffic lights". Thought it would be obvious to you that when you stop, theres no air flow through the bike, so thats of course where the bikes going to get hotter. You should start getting worried when the bikes getting too hot when you're cruising along. But as said, all it probably needs is a good clean.

Lasse wrote:Would that require some disassembly of crankcase to drill out the blocked holes?

Ageed I didnt think about that as ive got a uk spec but a sanwitch plate does work well also. mine doesnt run the standard cooler as I made new unions from the engine and plumbed in a big oil cooler which is is as wide as the bottom rad but about 75mm tall so it cools well :D Russ

I noticed my bike was getting very very hot, like 2/3 of the way around the temp gauge, so I stripped the cooling system out, tested the thermostat, replaced the fluid but most important cleaned out the bottom rad, it was pretty much completely blocked! It's still early days, only done one long ride and some short ones since, but I think the results are good. I'd bet a tenner it's just your bottom rad is blocked with crap (the fins I mean ).

Cleaned the insides?