I got a new, to me, 104 I want to turn into a puller
 

I got a 104 and she runs but not the best. I've cleaned the carb twice and still she wants to pitter patter. I can drive it but it eventually cuts out on me. What are some suggestions you guys have? Thanks and for those of you who read about my 149. I got her running good and haven't tinkered with her since. I am going full restoration on the 149. That project follows this one.

IMHO 98% of all carburetor problems are electrical.

Try cleaning the points and setting the timing.

I've thought carb problems on one tractor ended up being a burnt valve and bad head gasket

If it drives and eventually quits, it sounds more like a fuel restriction. There is (usually) a screen on the inside of the fuel tank's cutoff valve. Unscrew that and remove it. See if it's plugging up. You can check quickly--next time it quits, remove the fuel line at the carb and check for good flow. should be a strong steady stream, not just a trickle.

i doenst have a shutoff but i pulled the head and it had build-up between the cylinder and the valves so i gently scraped (taking caution not to scratch the head) as much as i can could that be the issue?

As Yosemite Sam stated usually electrical. Try changing coil and condensor. My 125 would mow for 15-20 minutes and die. Turned out being the coil and I changed the cond. as well.

where do i get them? and do you know where i could get a carb rebuild kit? thanks- Matt

Any small engine shop should have what you need. I usually get my stuff at my local Napa. Make sure if you buy a coil to get one with an internal resistor. Napa has small engine catalogs and you should be able to get a carb kit as well.

thanks i will give them a call sometime in the near future