Timing and Sync of Merc Inlines (to 1988)

[greasemonkeyjmj]

Re: Timing and Sync of Merc Inlines (to 1988)

what is the best way to set the idle, if your boat doesnt have a tach ?

THANKS

 

[huntxtrm]

Re: Timing and Sync of Merc Inlines (to 1988)

Mines a 86 model classic 50, it's a 45 hp. 21 degrees? or 34? don't know the difference between cross flow, or direct. Thanks in advance. ha get it, advance!

 

[monk-monk]

Re: Timing and Sync of Merc Inlines (to 1988)

So what makes 'em blow gas out of the carbs at WOT...

 

[Faztbullet]

Re: Timing and Sync of Merc Inlines (to 1988)

So what makes 'em blow gas out of the carbs at WOT...

Reed flutter.....

 

[Faztbullet]

Re: Timing and Sync of Merc Inlines (to 1988)

Mines a 86 model classic 50, it's a 45 hp. 21 degrees? or 34? don't know the difference between cross flow, or direct. Thanks in advance. ha get it, advance!

If it the classic 4 cylinder it sets at 32 degrees static,30 degrees @ 5500rpm

 

[Elpy54]

Re: Timing and Sync of Merc Inlines (to 1988)

I need help. I have aligned my distributor at TDC for cyl 1. Then measured .464 down the stroke counter clockwise. This makes my timing mark line up with the fine TDC mark on the flywheel and a fine line where the label says BTDC. I removed my distributor cap and im not sure if it was installed back in the correct position. I have also turned so many screws around the distributer that I dont know what is right or wrong. I can get my motor to fire but it will not run or idle at any throttle position. Also the only way I can get it to fire is to spray gas in the cylinders and then put in the plugs after the gas is burned not even a fire. Can someone please help I would be willing to call anyone this evening that is willing to talk to me or I can talk via this message board or pms. Thanks guys

 

[Dave1027]

Re: Timing and Sync of Merc Inlines (to 1988)

If you must spray gas in to get the motor to fire then it's stands to reason it's not getting fuel the normal way via the carbs.

Why don't you start a new thread and indicate what motor you have?

 

[Elpy54]

Re: Timing and Sync of Merc Inlines (to 1988)

I would start a new thread but for some reason the forum wont let me. Is it possible I could have a adjustment so far out that I'm not getting fuel this all seems really odd. All of this has happened after I changed the stator and fuel pump. I am getting fuel pumping from the pump no problem and I told you the time procedures I followed what could cause this?

 

[huntxtrm]

Re: Timing and Sync of Merc Inlines (to 1988)

Awesome learning material! Made my classic 50 run alot better. Pluss I learned alot about how everything works together, tinkerin with it.. Good job on the thread. And Thanks

 

[DC6driver]

Re: Timing and Sync of Merc Inlines (to 1988)

Howdy all

first time posting and looks like a ton of great info here.

Regarding Timing, would this set of instructions also work for a mid-80s Mariner 50hp 2 stroke 4 cyl?

I am new to working on outboards but keep hearing that Mercs and Mariners are the same thing.

I am taking over this 50hp Mariner from a friend and believe it has a timing issue.

thanks for any info! I will start a new thread if need be

Take care

Chris

 

[Dave1027]

Re: Timing and Sync of Merc Inlines (to 1988)

Clams,<br /><br />Your method for setting timing and synch for my Mercury 1978 70hp 3-cylinder was far clearer and intuitive than the method described in my SELOC manual. Thank you much.<br /><br />Thanks, 2cycle, for your question regarding where TDC really is...before reading and acting on this thread, my adjustable timing pointer was set to mark TDC as the mid-point in that "flat spot" you speak of. In effect, this caused my timing to be severly retarded...probably on the order of 12-15 degrees. It is no wonder that no other adjustments I was trying would fix my bogging/fouling/excessive fuel usage/hard starting problems. I reset the pointer to JUST where the piston gets to top, followed Clams' procedure, and now my motor has never, ever, started, idled, or run better.<br /><br />iboats is the best.

I realize this is an old thread but is this post correct? What is the correct TDC? Is it the middle of the flat spot or the point where the piston stops going up? I can see there being a few degrees difference (this post claims 12-15 degrees) especially with engine wear.