75 hp mariner outboard runs great in idle dies when put in gear

[hawkinscjr]

Hey all im new to this forum and read alot on the several post like mine some are quit old bt wanted to be specific to mine.So here we go!

I have a 75hp marier outboard serial 6468859 got i with boat from father inlaw alongwith a 85 hp mercuryoutboard for parts unit starts and runs great in idle and on muffs even shift into ear great and runs great in gear on muffs but when i put it n water as soon as i shift it into gear it dies unless i rev up throttle in netral and slam it in gear i will stay runing but not real well any help is very apprecated and if you know where i can get online manual for my motor that would be great s well thanks in advance

 

[racerone]

For one thing running on the muffs and in gear , means that the motor is still really in neutral.------Simply put the prop does not have to do any work just like it is in neutral !!--------Start with a compression test.----Then look for strong spark on each plug lead.----Spark MUST jump a gap of 3/8" or more.

 

[Mi duckdown]

What racerone posted. Then you have to get in it in the water/lake to make fine adjustment to the idle. Rpm at idle I think is 700/800 while in forward gear. someone will chime in if I'm wrong.

 

[1nebel0]

Yes on the 800...Idle timing controls idle speed...also need to check idle mixture screws to make sure carbs are balance.... Before all of this I would do the lync and sync to make sure throttle plates are closed and the necessary gap between the roller and throttle bracket are met...Trigger has to start moving before the carbs start to open....There are many things to do after the compression and spark test....