i read in a mag the other day that letting your bike idle up to op temp is no good, coz the oil doesn't get to the extremities of the engine. your therefore better off reving the tits of it, or just riding.
I live in the hills, and it's pretty cold in the morning, so I warm mine up to 40C (104F) before riding, and take it east until she's up to 60C (140F). After work, I have to ride through (and I mean through!) peak hour traffic, so I only warm her up to 30C (86F) before riding.
emme is right.
the castrol web site claims from there own testing that..
warm up on tick over will damage your engine.
thay claim that you should,
start your bike up, then ride away with the choke on if you have one. ( lower it as you ride)
and just ride under 7,000rpm untill warm, as the oil is pumped up and around the engine better,
and we should NEVER warm up a bike at stands still.
but what do they know about engines and oil..
i do what they say more or less.
i warm her up for a few minutes, then ride away.
this also makes you ride slower on cold tyres,
usually by the time i get to the filling station its at working temp anyhow..
but we should all do what we are happy with,
after all is`t your bike,
do what makes you feelsafe.