Originally Posted by _cy_
airheads carbs have a sliding piston that blocks air flow when taking a compression reading even with butterfly open. to get an accurate reading one needs to take carbs off or jam piston open. BMW motorcycle compression testing instructions
if you are new to airheads .. take extra care torquing down bolts that thread into aluminum. which is pretty much all over airheads. when spec's say 7ft lb ... it means it. a 1/4in drive in lb torque wrench is a handy tool to have around.
spec's list compression at a low 7.5-1 ... so engine could be just fine if your /2 starts and runs good.
pretty safe to say several inmates, including me would be happy to take that /2 home.
Fantastic useful information! I do know after reading this that the right cylinder does have the flat spot when trying to adjust the carb plus it's sound is not as crisp as the left. We shall see...