I have a fradan BB51 leaf blower. Its been well maintained and cared for. About 1 year ago it started dying at full throttle. It starts and runs well for a couple of minutes and (at full throttle) then after a bit it boggs down and dies. If you close the throttle it will refire and idle fine. I have done everything. Repaired the carb, adjusted the hi and low jets, cleaned everything, replaced the spark plug, cleaned the exhaust, replaced gas filter, added seafoam to fuel/run though carb and exhaust ports are fine. Last week I put on a new carb and it still does the same at the high end. The only thing I have not done is replace the fuel line (fuel comes out fine when you disconnect it from the carb). There is good compression. I am pretty much out of ideas.