Mower throttle fault

[PeterC]

Tried sorting out a neighbour's old McCullock mower today and didn't get very far. Symptoms:

1) 'hunting' all the while 2) won't restart when hot (so tape round the throttle; cap off plug to stop! 3) starter cord has no effect when the engine is hot

so far: for 3) I can't see any cause - looked under the cowl and a gentle pull on the cord extends the pawls and they seem free.

for 2) I've had to remove the tape so have suggested a sliding clip/band. This problem might be related to the hunting.

for 1) I wondered if it might be lack of fuel, as t'other neighbour managed to get my Honda mower hunting by forgetting to turn on the fuel. Fuel's getting through, float chamber almost clean and the jet's had a blow-job from a foot-pump. Looked at the plug: grey on the electrodes and black elsewhere. End of exhaust black, so cleaned adecade's-worth of crud from the air filter.

Still hunting, dammit!

Found that the throttle doesn't have any effect except run and stop and also doesn't directly move the levers on/near the carb. It moves a plate against a spring on the opposite side of the engine. When the engine is hunting, a c. 2mm move of the little lever on the carb gives full revs and no hunting. What I don't know is the method of controlling the revs - as the engine hunts the lever on the carb is moving in time to the hunting.

Any pointers please to how this works and how to correct the fault?

[PeterC]

Eventually found out that the engine isn't B&S but Tecumseh! (does help to know this bit!). From a forum discovered during a search, came across a recommendation for

. e-mailed a request for help and have had an exchange lasting for a couple of weeks now, eventually leading to some rather 'bulky' manuals being e-mailed to me. I still have to get to grips with the info and then find a source of TecumsehTuits, but I must say that the help from this company and the correspondent has been v. good. Only connection is asking for help - heven't even bought anything.