Hi,
A club member has a thunder tigre 70 something 4 stroke that will not run at more than 1/2 throttle. It has about 24oz fuel through it, all at 1/2 or below. We have adjusted both the hsn and lsn all over the place. To get it to run at even 1/2 throttle you have to have the hsn turned out about 3-1/2 turns. I took the hsn out and flushed the carb. Adjusted the push-rods, one was about 15mm. I normally am pretty good with tuning engines but this sucker has me baffled. It is a new engine and seems the LHS doesn't seem to want to do anything about it. I think he is at the point where a hammer looks like a good fix. Any help would be appreciated.[][][]