Well when it turns over how is the speed? normally you can get an idea by the speed of the engine if the compression is do. If it spins a little fast then it may be low. Also, you can get an idea by just pulling the plug and putting your finger over the hole. If it blows your finger off with some force when you turn it over the compression is still good. Give those a shot before looking for a compression tester. Also, try a little carb cleaner in the cylinder for a little jump start, but not a lot of it.