It is finally getting cool enough in Arizona to work in the garage after 53 days this year of 110+ temperature. Finally received my #40 slow jets in the nail after an 8 week wait. Will be putting the carbs back together tomorrow.
Anyway, finally got a battery and a compression tester. Bike is a K4 with an F0 engine. Hasn't run since 1998. I wanted to do a compression test to see where I was at to start with. Last weekend I removed all the plugs, and shot one squirt of Marvel mystery oil down each cylinder and kicked it over a bunch then let it sit all week. Today first thing I did was adjust the valves and cam chain. Then I hooked the battery up and cranked the motor for a few minutes til oil pressure light went off. Then I began the compression test. BTW, I was using an old Sears Craftsman tester. Here's the most consistent numbers I got.
#1 - 160 #2- 148 #3- 147 #4- 165
Here are my questions. How are these numbers for a cold test? Why would the middle cylinders have that much lower compression than the outside cylinders? I would rather not rebuild the engine if I can avoid it money wise for now. The difference between cylinder 4 and 3 is more than 10%. Would getting it back together and doing a hot check make any difference possibly?
