1971 mercury 650

[QWXZAS12345]

I have just put a new engine on my boat (1971 mercury 650 w/ thunderbolt ignition) I rebuilt the carbs on this engine before installing.... my question is about the 2 main cables that connect the throttle and gas lever from the ignition. I was able to adjust the main throttle so that the gears matchup (forward, nuetral, and reverse) I am not sure where the starting position on the gas lever should be... there is somewhat of a locking position in accordance with the linkage off the distributor bascially right in the middle and I was guessing this would be where you might adjust it to.. but I wanted to make sure this position is correct before I move on to adjusting the idle speed on the carbs... the engine runs fine but hesitates a little before accelerating from neutral...any tips on this would be a great help...<br /><br />thanks again guys,<br />boaty boat

 

[QWXZAS12345]

Re: 1971 mercury 650

i just wanted to get my topic back to the top hehe....anyone out there with any knowledge on my problem???? i feel like im really close to gettin this thing runnin good...

 

[QWXZAS12345]

Re: 1971 mercury 650

anyone??? please.....

 

[forddiesel]

Re: 1971 mercury 650

The throttle stop screw is also used to adjust the idle speed. The fast idle lever on the throttle should be in the down position when making the above adjustment.

 

[y2jericho]

Re: 1971 mercury 650

hey dude i got the exact same engine as you!<br /><br />Can you explain to me where you connect the 2 tacho wires to <br /><br />I can't seem to find it<br /><br />any help would be great <br /><br />(i got a stewart warner tacho)

 

[steelespike]

Re: 1971 mercury 650

Boatyboat,Hope your working from a manual.<br /> Grubbs Marine has reprint owners and service<br />manuals for your motor at:www.oldmercs.com

 

[chrismercury]

Re: 1971 mercury 650

Does anyone know how many fuel pumps on my 1970 mercury 650 4 cyl, it has two carbs and one fuel pump. can it run like this or will it not get enough gas and damage the pistons?<br /><br />Thanks for any help

 

[chrismercury]

Re: 1971 mercury 650

also does anyone know why someone would want to put a second fuel pump

 

[rickdb1boat]

Re: 1971 mercury 650

If you had 4 Carbs you would need 2 pumps. It will run fine like it is.

 

[chrismercury]

Re: 1971 mercury 650

Thanks exactly what i needed to know

 

[mmreagan200]

Re: 1971 mercury 650

i have a 1970 mercury 650 4 cylinder that runs good and it only has 1 fuel pump that is how those were made.

 

[sharkcat]

Re: 1971 mercury 650

The stumble from idle will probably be a lean idle mixture.If you havent got one get a manual cos with an old engine youll need one if only for reference.Jericho the tach wires are connected to the cotrol box there should be a plug under the choke button..Hope this helps

 

[aredant]

Re: 1971 mercury 650

On my '71 Merc 650 the tach connects to a socket at the front of the control box. I mistook the cover for a dead idle control knob at first. This is a 3 pin connector based on an old connection type called a "jones" plug. I would like to know where I can get a tach for this.