Mariner 40hp rev counter

[dennis suttenwood]

"Can anyone tell me what wires

"Can anyone tell me what wires i need to splice into to connect a rev counter to this engine as i want to check idle and WOT rpm, also is the timing, idle, 2 degrees + -1 btdc, pick up, 6 + -1 btdc, WOT 22+-1 btdc, it is a twin carb, cdi model, thanks in advance"

 

[galamb]

"Dennis, a serial number would

"Dennis, a serial number would help - Mariners were built by both Merc and Yamaha over the years and are both a little different...."