What spark tester are you using? Most of the light up ones will still light up if you have weak spark. You either have to check the spark on a plug (it should be bright bluish white) (if it is a yellowish color spark it will pop off occasionally but it will not start, I would suspect a bad condenser)
Or buy yourself a 1/2 decent spark Gap tester. I have one of the Oregon in line spark testers. Used to be able to get them off of amazon for $8-$15 but I can't seem to find them on there. You can order 1 off of Walmarts site for $12.27 + shipping if you want to pick 1 up.
Robot or human?
Rained out and now it won't start? Moisture in the points cover will do that. Spray the points and condensor and the cover out with brake parts cleaner and run a piece of emery cloth or fine grit wet/dry sand paper over the points.
A magneto and condenser usually goes bad when you shut the machine off. You are basically shorting both the condenser and Mag out to shut the engine off.
Put the original carb back on if it worked. Alot of the aftermarket carbs are hard to tune and some just run like crap no matter how much you adjust them.
Speaking of Walmart I have been buying quite a few parts off of there online store recently. They have all sorts of stuff on there now including pistons, rings, connecting rods, starters, carbs, tires, tubes you name it. My eyeballs about popped out of my head when I found a decent aftermarket piston and cylinder and clutch drum for my old Husqvarna 55 chainsaw on there. Shipping is alot cheaper than Amazon shipping if you do not have a Prime subscription. I did buy the more expencive Hyway brand parts but they are alot better quality than most other aftermarket parts and they are still around 1/2 the price of OEM parts.
