2005 Mercury 125 2 stroke fuel problems

[Bradley5715]

Okay so I have changed just about everything and still seems to be losing fuel pressure. Will idle and start out strong but after a short distance will slow down. Pump primer, and will keep going strong. I have rebuild fuel pump, replaced fuel line, changed fuel filter, and even put a small fuel tank beside the motor with a shorten fuel line. I took the pump off to see if I had good crank case pressure and it seems to be there. Any help would be great.

 

[QBhoy]

Is this an optimax 125 ? If so I’d be looking at injectors perhaps. Look for unburnt fuel out the exhaust too.

 

[Bradley5715]

No, carbureted. Thank you

 

[Johnson110]

Maybe hook up a electric fuel pump as a test?

 

[flyingscott]

Don't hook up an electric fuel pump. Does.it.idle.correctly? Make sure your fuel pump is.in good shape and rebuilt correctly. The fact you pump the.primer and.it runs good leads to a fuel pump issue. Are all the fuel.lines in good.shape no kinks. Are the carbs clean.and set correctly?

 

[Faztbullet]

Since you rebuilt pump go inspect it as if you installed the rivets to tight it will buckle the rubber check disks and cause them not to seal.

 

[Bradley5715]

Thanks everyone for the responses. Went out today with a glass filter right before the carbs and it stayed full with no air. I think when I pushed the primer ball before, I was over feeding the motor, which would make it pick up speed. I notice that the hotter it got today the worst it would run. I have changed the voltage reg. and stator a while back after finding burnt wires. I may try a trigger assembly.