Hi All,
I need help from the mercury gurus. I seem to be missing something on setting the timing 90hp my 90hp 2 stroke. I was checking the WOT timing 1995 90hp Merc 90hp Merc and the indicator was pointing at ATDC degrees ATDC and was alarmed. This check was done as per the Mercury Factory Manual, cranking the engine with a well charged battery, spark plug leads or spark plugs removed and grounded, throttle ect ect ect ect. carb The carb sync, throttle cam, throttle stop, idle and idle stop were adjusted OK. The max advance screw had orange paint sealing it. I was using an inductive timing light on number cylinder (top) cyclinder. I promptly adjusted the max timing screw but the screw bottomed out and all I could get was between 4 to BTDC deg BTDC. I moved the linkage of the stator by hand and all I could get was a max advance of BTDC deg BTDC, no where 21 the 21 degrees. The timing pointer is plastic and formed with the flywheel cover and likely cannot move out of adjustment. The flywheel does not look like it shifted on the crank. Also the engine runs well over the entire 90hp low-mid (90hp low-mid rpm vibrations standard). However, since I guessed the timing point to put it back to (erring on the side of caution), I lost a MPHs of MPHs. Unfortunately, a thorough search of hasn't forums hasn't turned anything up. I even tried putting the timing light on the other 2 cylinders didn't that didn't help. Any ideas? What am I missing? Do I need to apply an advancing timing isnt that isn't described by mercury? I thank all in advance for your advice!
I need help from the mercury gurus. I seem to be missing something on setting the timing 90hp my 90hp 2 stroke. I was checking the WOT timing 1995 90hp Merc 90hp Merc and the indicator was pointing at ATDC degrees ATDC and was alarmed. This check was done as per the Mercury Factory Manual, cranking the engine with a well charged battery, spark plug leads or spark plugs removed and grounded, throttle ect ect ect ect. carb The carb sync, throttle cam, throttle stop, idle and idle stop were adjusted OK. The max advance screw had orange paint sealing it. I was using an inductive timing light on number cylinder (top) cyclinder. I promptly adjusted the max timing screw but the screw bottomed out and all I could get was between 4 to BTDC deg BTDC. I moved the linkage of the stator by hand and all I could get was a max advance of BTDC deg BTDC, no where 21 the 21 degrees. The timing pointer is plastic and formed with the flywheel cover and likely cannot move out of adjustment. The flywheel does not look like it shifted on the crank. Also the engine runs well over the entire 90hp low-mid (90hp low-mid rpm vibrations standard). However, since I guessed the timing point to put it back to (erring on the side of caution), I lost a MPHs of MPHs. Unfortunately, a thorough search of hasn't forums hasn't turned anything up. I even tried putting the timing light on the other 2 cylinders didn't that didn't help. Any ideas? What am I missing? Do I need to apply an advancing timing isnt that isn't described by mercury? I thank all in advance for your advice!
