Thanks Troy,

I will try adjusting the pump and low end so they are richer this coming weekend. I did try leaning the low end, richening the top end and leaning the pump last Sunday only because I thought my fuel consumption was too high and it seemed rich on the low to mid range. That problem turned out to be that the overflow tube had rotated only allowing the tank to be 3/4 filled.

I must say that this model and engine has performed faultlessly until a few weeks ago when outside loops were performed.

I'm sure that I will get to the bottom of the issue by a process of elimination. It's been a good learning experience anyway.. It really gets you thinking!

Cheers
Jason.