Hi.. The machine is an 85 Yamaha SRX250, single cylinder. Replaced the shims, part of a long saga trying to restart the bike. anyhow, you know how sometimes you make those dumb ass mistakes that hopefully you'll only do once?? I did one. Took the camshafts off without marking them.](*,)](*,) Now, I have a manual, and there are instructions on reassembling.. How do I know its the compression stroke??