Hello folks, im very new to these forums and even newer to trails. I currently own a 315 montesa 2000. Its my first trails an im struggling. Firstly I noticed my carb ( dellorto phbh26 cs ) is missing a screw and its terribly boggy. The thing is I dont have a clue which screw it is. As you look at the carb as its on the bike its the screw on the very left. Main jet? oil screw? I dont have a clue. Any help would be much appreciated im itching to get out on it. Thanks