merc 500 refuses to start

[rolmops]

This is a 1967 50 horse 500ssls.It has 120psi on all four,new L76V plugs,completely rebuilt carburators,clean fresh fuel and enough spark to jump over 1/4 inch.<br />Is there a cutout switch I should know about?<br />In another post I read something about suspecting the "trigger".What is this trigger?<br />Sometimes after running the starter a bit it will back fire or fire one stroke and then actually stop the starter as if it kicks in against it.<br />Is there something obvious here I should know about?<br />Any advice will be highly appreciated.<br />ps,yes I do have a manual.<br />thanks,Rolmops.

 

[Barnacle_Bill]

Re: merc 500 refuses to start

I would check the timing.

 

[JB]

Re: merc 500 refuses to start

Yep. I second Bill H, Rolmops.<br /><br />Maybe even a sheared flywheel key or. . . .<br /><br />Got the right leads on the right plugs??<br /><br />Good luck.

 

[Daniel Rothering]

Re: merc 500 refuses to start

I have a 105 mercury motor and it starts and I run it around sand lake michigan and after 10 minutes it cuts off....it seems like a safety switch that cut us off.<br /><br />I appreciate any help I can get...

 

[mellowyellow]

Re: merc 500 refuses to start

not enough battery? these old girls need lotsa<br />lube...

 

[JB]

Re: merc 500 refuses to start

Siggns.<br /><br />Please do not hijack someone else's thread. Start a new one.<br /><br />Thanks.