Originally Posted by Clayton M

Hi kiwi bob,
Yes i have a sinterd clunk in the fuel tank. I read about that somewhere before and put one in. I get no bubbles at all when running with the cowl off but get bubbles with the cowl on which tends to suggest something other than the fuel tank and supply. im completely at a loss at the moment. Only thing i can think of is its heat related. Horizon tech support had no answers either.
btw, i swapped the carb as well and that made no difference. There must be someone out there that has this combination running.......I think tinkerman rc had one running