The guy that does mine(when they need it) is a certified tech. He won't do them below 60. I have to bring the bike in the shop and let it warm up to room temp. As always YMMV.98yell750 said:The problem is that at what ambient? These are very tight tolerences and the temprature makes a very big difference so does the manual say "60 f" or does some one know of a proper temp. I will do this during the winter and 20 F can make a major difference than 60F.
Yeah, but the clearances can be adjusted to be measured at any temperature. Just like tire pressure. You put in less pressure than what the tires run at because you know when they heat up the pressure will rise to what they should be. Maybe it's more of a compromise between warm and cold tires, but that's beyond the point.KenSwift said:I guess this would be a way to see if it makes a difference (or rather, a significant difference):
Get two shims of the same size and put one in the fridge and one at room temp (let's make it a 50 degree F difference just for the sake of this argument); measure and let us know the size change based on temp.
I'd be interested to know how much of a difference it would make, as here's a scenario for you:
Shim sitting in engine that's 50 degrees F; you measure and it's too small. You pull out another shim that's the right size, but it's been sitting in your 98.6 degree hand for a couple of minutes... then you put in in the bike and it's heading back down to 50... so will it still be the right size?
My thought is that if this was such an issue, you'd be keeping your clearances much looser than we currently do. After all, you might measure at 60 degrees, but then the shim is at 200+ while operating (not to mention the additional stress of getting pounded by the rocker arms, that adds heat too).