Tecumseh Carb Questions?
Recently I bought a Toro 521 snowblower for my aging brother on-law. Seller said runs but rough and he left gas in it over the summer. I thought it was a good investment for a simple carb cleaning and rebuild. Not such a good investment after all since the carb rebuild failed and had to buy a new carb for 60.00.
The carb I received was a fixed jet, unlike the old which had adjustment screws for both idle and high speed.
The engine starts fine and runs decent using the electric start, but hard to start using the pull starter.
My question is, can I use the high speed adjusting screw from the old carb, pop out the plug, and insert the idle speed screw I have from the old carb?
I don't want to try it before I get confirmation that it will work. The carbs look identical from the outside.
My second question is why after a carb rebuild would the carb start leaking. It wasn't leaking before the rebuild.
The symptoms show it's a float problem, but disassembling numerous times didn't correct.
Symptoms are when gas valve is opened gas come out of the throttle plate and drips down. By hitting the primer just makes matters worse. Also gas leaking from bowl seal, didn't leak before and replaced with a new one from kit.
Put the old one back and still leaked.
I gently removed the floats needle seat being careful not to score the walls. Inserted and pressed in the new seat with groove side down. Tested the float for leak, no leaks there.
Adjusted the float height using a 11/64 drill, that didn't work so I adjusted to float being level with carb body, that too failed. Replaced both welsh plugs being careful not to damage body, although clean, I cleaned the small holes on the exterior welch plugs with carb cleaner, then blew out with compressed air. I then sealed that plug with clear nail polish.
I have rebuilt several carbs with success, the only difference was on the other rebuilds I never replaced the welch plugs. The outer welch plug does not leak. I am wondering if this could be where I went wrong, and could this cause the carb to leak.
Sorry for the lengthy post, but I wanted to be as detailed as possible for a proper diagnosis.