LSN isn't your problem right now. With changing weather conditions, your hsn will need to be tuned to suit. By all acounts the trx 2.5 is sensitive to tune, so this is probably your whole problem. I don't have any links at the moment, but searching here and Google for something like 'how to tune glow engines' will give you lots of reading material to get you started. You'll be a pro engine tuner in no time.