Last time I timed the mag I used my digital multimeter to detect the small difference in resistance between points closed and open. I tried to do the same this week but gave up because I couldn't see a clear difference; it must be just a few ohms, (the battery may be low in the meter). I thought I might as well hang the expense and invest in some Rizlas; so much easier! I do have a home made device to stop the piston at the correct BTDC which helps the process. Plugs out, fourth gear selected, left hand gently tugging the paper strip, right hand turning the back wheel forward. The croc clip idea sounds great; next time..