Well, it has been a year since my last topend job. I just ran a compression test and I'm getting about 170-175 psi (manual says usable is 115-178). My question is: how important is it to do on a warm engine? The book says to do it on a warm engine so that the engine oil between the piston and cylinder wall will help seal compression. Is it absolutely necessary? (It's 7:32 pm here and my neighbors wouldn't appreciate me warming my bike up!) I'm just needing to check to ensure my rings are still good and the bike is in rideable condition -- more or less how much longer before I have to think about pulling the jug off!