engine not getting enough power

[vandancouver]

i have a 5.5 briggs, flathead..it always runs perfect. torque converter with jackshaft is on it..disc brakes.

i took it out for about a 2 mile ride in the dirt and it was running perfect until i got almost home. if i step on the throttle hard it will rev up and take off like normal but about a second later it sputters out and wants to die if i keep flooring it. otherwise it will idle perfectly.

i took the engine apart and cleaned the carb, cleaned the screens that go into the gas tank from the carb, replaced the spark plug, rebolted everything down. i am thinking could it possibly be the diaphram carb? it looks good though..not sure what else it might be..

 

[Russ2251]

it looks good though..not sure what else it might be..

Could still be bad. Once it's disassembled it must be replaced anyway.

 

[EagleTalons]

Could be a pinhole in the diaphragm. That part is under a lot of vacuum stress.

 

[vandancouver]

yeah ill guess ill have to go buy another one after work tomorrow to try it out. it seems like thats all the symptoms its leading to...

why would it need replaced if you disassemble it though?

 

[solomon]

you may want to consider the flywheel key. my motor was starting fine like there wa no bad key but wasnt running right and it sheared a key. Check it out!

 

[vandancouver]

yeah it could possibly be. i kinda doubt it is though..it starts fine and it even drives..if i floor it itll go for a few seconds then want to cut out unless i get off the throttle. i kinda doubt its that. the flywheel key is the timing and it wouldnt even run if it was sheared i dont think

 

[solomon]

mine ran what seamed like it was fine with the key sheared. It just advances the time way too much and causes issues at different points for every person, if i were you i would check that and i would check compression, cylinder walls, and air leaks

 

[EagleTalons]

yeah ill guess ill have to go buy another one after work tomorrow to try it out. it seems like thats all the symptoms its leading to...

why would it need replaced if you disassemble it though?

It is a gasket and won't seal right after assembly.

 

[vandancouver]

oh i see. i got a new diaphram, im going to replace it then check it, then afterwards check the key..see what happens

 

[solomon]

ok let us know hope all goes well