I looked in top secret file to time my 88 hp motor without having to race across the lake will trying to attempt it (especially with my wife driving) but do not fully understand it. At wide open trottle I do not see any rubber stop that timer base even comes to touching. The adjustment screw contacts a stop at idle. Also, what is the spark plug tester with the 7/16 gap I have to make ? And, with spark plugs out and cranking engine with timing light connected to No. 1 cyclinder, shouldn't all plug wires be grounded to prevent damage to the ignition system ? Also, where does spark plug tester go ? Thanks KeyKev