42K. As the engine was due a service I got them to sort it out. It needed the carbs cleaning which I thought was the problem but when I went to pick it up they told me about the choke.
I suppose to check it you would need to run it with the cowl off and see if the choke came on even if the engine was warm.
The symptoms for me would be that the engine would generally run fine up to 4000 revs then if I went any higher it quite quickly started to bog down and run at about 2500 revs but not erratically. If I rested the engine it would then be okay until I went fast again.
My control box had had all the cables cut and rejoined when I bought the setup. It was at the join I got problems with corrosion. Since they did a good job of it I have not had anymore problems and she runs as sweet as a nut.
Strange thing is I nce had a car where the choke stuck on and that didn't really seem to affect the performance anywhere near as much. But it was easier to fix.
Best of luck 42K and if you don't get much luck here why not try http://www.iboats.com/bbboard/html/mainpage.html
now they really know there engines.