Thanks for the comments.
I replaced the needle seat with a new one and left it until the following day to try it out.
The carby is now flooding as the engine initially hydro locked and just about dislocated by shoulder on the first pull. After a few measured pulls of the starter rope I cleared the excess petrol out and it fired up quite easily. The mower ran quite well albeit a little fast but nothing to be concerned about. I can adjust that later on.
I am assuming the seats in Tecumseh carbs are compatible with all carbs including the odd design ultima. The needle seat I pulled out of the ultima carb was quite hard and not soft so I suspect Grumpy you were correct. I re-installed it carefully but something might be up. I�ll have to re-check the carb again tonight. The grooves on the seat were placed down like all other Tecumseh carbs.
Top speed is quite nice but the [Censored] thing just won�t idle at all. I�d appreciate some tips on the idle adjustment but I assume it�s the same as all other Tecumseh�s. The others I have worked on all adjust quite easily. I do suspect we have some further problems contributing to this issue.
Tonight I will re-check the carb but I would appreciate any additional thoughts deemed appropriate.
Also the air filter is brand new. Removing it make no difference as I suspected.
Peter
