Old Game Fisher Will not stay Running

[Troytroy40]

I purchased an old game fisher 3.5 hp engine that had sat with little or no gas in it for a few months before I purchased it (so I was told)

My problem is that I pull the cord and it will only start with the choke off for a few seconds then stall. So I took the carb off and appart cleaned it and the fule lines got a new spark plug put some Premium gas in it with a small engine tune up additive and a additive for marine engines for the ethanol. Now I can start it with the choke and it runs for 30 seconds then dies. If I pull the cord when it starts to sputter it will keep it running for another 30 seconds. If I lower the trottle it dies if I increase it it dies quicker. It itles very rough. I can also keep it running by instead of pulling the cord when it is about to die turing the choke off. the engine fires up for a few seconds but will then die if I do not put the choke back on and then need to do it again in a few seconds.

I thought it was bad that was left in it so I ran it dry and no difference. I have standard 2 stroke outboard motor in it at a 40:1 ratio as the new oils only need 50:1 but back when this motor was made it recomended 32:1. This is an old motor with No fule pump. I have tried just running the good gas with additives through it but after around 30 min of run time it still is not improving. I noticed the spark plug gets black build up on it after only a short use. could that mean anything?

Any advice would

 

[brim_buster]

running rich

 

[Troytroy40]

Update:

So Last Night I took the carb apart. There was only one Jet and it was one hell of a time getting it off. I recleaned everything, and put it back together I also took the spark plug out recleaned it, sprayed it with spark plug/electrical cleaner.

Turned the choke on to start it and it would not start, so I assumed it was flooded so I turned the choke off pulled the cord and still nothing. eventually I got it to start with the choke off by pulling the cord non stop till it was almost up to speed. Now I can only start it with the choke off but it Runs like the choke is on. it will still stall but it last 1 or 2 min beforehand.

I tried adjusting the IDLE screw in 1/4 turns but that makes no difference. I had it as tight as it goes to off and no difference. it was not a standard screw though, it was cone shaped with a point at the end. There is no mixture screw none at all I looked and looked but there is none.

Two things I did notice was that the flote needle did not go in far enough to really let the flote come up (seems to be some rubber stoper in there. Also after only a few inits of running the water can I was running it in was black. Not just some gunk because when I put my hand it it to check somehing (as it was to dark to see) it came out like a bird in an oil spill

any thoughts? how can I adjust the mixture so it is not running rich with no mixture screw?

 

[robert graham]

There should be a small cir-clip on the carb slide needle that can moved up or down....in the top/upper position it would lean out the mixture....that's the only mixture adjustment.....you may want to remove carb and exhaust chamber, then remove the cylinder/head....check that your piston rings are not stuck in their grooves...they can be carefully loosened up and cleaned....also check exhaust port for carbon deposits....it's not a very difficult job but be careful cleaning the rings so you don't break one...

 

[Troytroy40]

Thank you for your response. I will give that a try. I will take it all apart and clean more then the carb. I will also re-look at the slide pin to see if I can adjust how deep the needle goes. When I tried it just looked like rubber peice was stopping it from going in all the way so I will try pushing that back as well.

 

[robert graham]

The carb float, needle and needle seat must work correctly to maintain fuel level in the float chamber....