Long story short, what effects of the maxium spark advance being retarded 6 degrees would do to an outboard? would it just never be able to achieve max rpm? Any thoughts on this? Is there any other way that one of these crossflows can be out of time other than a sheared flywheel key or sticking timer base or some baffon screwing with the linkages?
Long story time:
So I inherited a 110hp from my dad that he used on center console that the transom finally rotted out and I've put it on a javelin fish and ski. He never worked on it or ever had any issues with it..
It seems to be in great shape, excellent compression, even across all 4 cylinders. VRO had been disconnected. A previous owner had probably rebuilt the carbs.. but other than the worm gear hose clamps everything looked original and in place.
I've done the usual refresh to this motor , Bought a factory service manual, rebuilt the carbs, replaced the vro pump with a new standard fuel pump, new impeller , etc.
When i was putting the carbs back on the motor I noticed the throttle linkage that syncs the two carbs was upside down. That was accomplished because some previous owner had placed the plastic retainers away from the carb body rather than towards the carb body... That was my first indication that someone had been monkeying with the motor. I also noticed the carb butterflies were not 100 percent horizontal at wot. Close but not quite.
I went through all the link and sync steps in order with a service manual in hand and even watched the orignal omc training video posted to brandon's garage (thanks btw if he reads this) on youtube. I fashioned my own piston stop tool out of old spark plug. The timing pointer was correct. So I went through the rest of the steps and when I thought I was almost done , I checked the maximum spark advance using joe reeve's method and it read 18 degrees .. the book calls for 28. I was kinda in disbelief because the few omcs I own and have worked on they are always timed right. Thinking that maybe this dial back harbor freight timing light must be screwy I ordered a new fixed bosch timing light and got the same results. I decided to check the maximum spark advance using one other method that I've used on smaller two cylinder motors and thats advancing the timer base without opening the carbs by disconnecting the linkages. this crossflow doesn't have a rubber stop like some motors Ive worked on, the timer base is limited by the linkage constraints. so i made a stop with a piece of wood , fired the motor up and moved the timer base with the spark advance rod disconnected to the wood stop and lo and behold the timing reads 22 degrees verifying the result the joe reeves method gave. The only thing that I can think of is that a previous owner fiddled with the spark advance adjustments as well.
Long story time:
So I inherited a 110hp from my dad that he used on center console that the transom finally rotted out and I've put it on a javelin fish and ski. He never worked on it or ever had any issues with it..
It seems to be in great shape, excellent compression, even across all 4 cylinders. VRO had been disconnected. A previous owner had probably rebuilt the carbs.. but other than the worm gear hose clamps everything looked original and in place.
I've done the usual refresh to this motor , Bought a factory service manual, rebuilt the carbs, replaced the vro pump with a new standard fuel pump, new impeller , etc.
When i was putting the carbs back on the motor I noticed the throttle linkage that syncs the two carbs was upside down. That was accomplished because some previous owner had placed the plastic retainers away from the carb body rather than towards the carb body... That was my first indication that someone had been monkeying with the motor. I also noticed the carb butterflies were not 100 percent horizontal at wot. Close but not quite.
I went through all the link and sync steps in order with a service manual in hand and even watched the orignal omc training video posted to brandon's garage (thanks btw if he reads this) on youtube. I fashioned my own piston stop tool out of old spark plug. The timing pointer was correct. So I went through the rest of the steps and when I thought I was almost done , I checked the maximum spark advance using joe reeve's method and it read 18 degrees .. the book calls for 28. I was kinda in disbelief because the few omcs I own and have worked on they are always timed right. Thinking that maybe this dial back harbor freight timing light must be screwy I ordered a new fixed bosch timing light and got the same results. I decided to check the maximum spark advance using one other method that I've used on smaller two cylinder motors and thats advancing the timer base without opening the carbs by disconnecting the linkages. this crossflow doesn't have a rubber stop like some motors Ive worked on, the timer base is limited by the linkage constraints. so i made a stop with a piece of wood , fired the motor up and moved the timer base with the spark advance rod disconnected to the wood stop and lo and behold the timing reads 22 degrees verifying the result the joe reeves method gave. The only thing that I can think of is that a previous owner fiddled with the spark advance adjustments as well.