I just picked up a sportwerks 26 engine for my H7 and was curious as to how the carb insert is removed from the carb. It came with one preinstalled already in the carb, does it screw out or just pull right out,I didnt want to mess up the carb so I posted here first also what is the most common insert to use the 6.5,7.5 or 9mm is there really that much of a power difference? The manual says the 9mm insert is for the most power and makes the buggy hard to control is this true?..thanks