mmmmmmmm...
Jan; is not running lean, the first suspect was this and the failure showed even working with high needle very opened.
Next step: what you said: Major surjery looking for small dirts into the carb/lines or whatever.
The engine is new but already burned about 4 to 5 gallons...
Could the problem be realted with an undersized propeller? I'm still spining the breaker 16x6 where the manufacturer reccomends 16x8 to 18x8. (to be sincere; I don't believe the problem is that but I do'nt neither know what to believe or not at this time...)
Thanks; hope to hear more ideas
Guille