Ok I know that sounds weird but here is the problem to question.
I have a old 650 merc that has been well used but has great compression. The running of the motor is good but at idle the engine revs like crazy, pop it in gear and it runs good. I just want to get the idle down to a reasonable level, sounds like its in the 2000's. I have backed off on the idle screw to the point it is not touching. Rebuilt the carbs thinking I had a stuck float. Cranked the timing screw in and I started to get some kind of response to the adjustments. Still it revs to high so got to looking for a timing adjustment in all the books and web pages. Found out tho that the flywheel has been taken off of the timing belt gear and put back on. So here is the problem I dont think it is anywhere near correct. Can anyone tell me the relation of top dead center on number one pistion to the "keyway" on the crank shaft. Mine points to the casting line on the top rear of the motor. Then keyway to the flywheel if it is lined up with sticker top dead center or sticker to pointer on the side near disturbor top dead center. Then I need to know if you advance to 23 degs at pointer then time the dist. gear.
I know the whole flywheel timing being off makes a mess of things but the motor has been worked on by many less able than even me.
Oh I know this is my first post but this forum has helped me fix a many of motors in the past. Noteably and choke problem on a pesky 85hp Evinrude. Just got to get them tight is what I found out here and fired the first time after that. Want to say thanks for all the help.
I have a old 650 merc that has been well used but has great compression. The running of the motor is good but at idle the engine revs like crazy, pop it in gear and it runs good. I just want to get the idle down to a reasonable level, sounds like its in the 2000's. I have backed off on the idle screw to the point it is not touching. Rebuilt the carbs thinking I had a stuck float. Cranked the timing screw in and I started to get some kind of response to the adjustments. Still it revs to high so got to looking for a timing adjustment in all the books and web pages. Found out tho that the flywheel has been taken off of the timing belt gear and put back on. So here is the problem I dont think it is anywhere near correct. Can anyone tell me the relation of top dead center on number one pistion to the "keyway" on the crank shaft. Mine points to the casting line on the top rear of the motor. Then keyway to the flywheel if it is lined up with sticker top dead center or sticker to pointer on the side near disturbor top dead center. Then I need to know if you advance to 23 degs at pointer then time the dist. gear.
I know the whole flywheel timing being off makes a mess of things but the motor has been worked on by many less able than even me.
Oh I know this is my first post but this forum has helped me fix a many of motors in the past. Noteably and choke problem on a pesky 85hp Evinrude. Just got to get them tight is what I found out here and fired the first time after that. Want to say thanks for all the help.