I recently got a 1996 Trx 300ex and had to use the choke for it to run even half throttle. It turns out the rubber tube running from the air filter box to the carb wasn’t on right. Therefor too much air was getting in and that why the choke had to be on all the time. Once I got that all straightened out it ran really good. But that isn’t the problem, when I got the four wheeler the reverse worked perfectly... Now I can't even get the reverse lever to budge and I know I’m doing the right/same process as before. It’s just one day it decided it’s not going to go into reverse... which reverse is kinda useful for where I ride at. If anyone can help that would be greatly appreciated.