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Message: [QUOTE="gene22, post: 1246871, member: 79989"] Hello, I just installed a Pro circuit Pipe and R304 silencer on my 2001 RM 250. The bike runs like the choke is on even though it is definately off. The temperature is between 40 and 50 F. The jetting is stock (162 main, 48 pilot, stock needle (3rd position), air screw 1 1/2 turns). Only other modification is a Twin Air filter. Do I need to rejet. If so, does anyone have any suggestions? I plan on riding the bike in an indor track where the temperatures is between 40 and 50F. Thanks, Gene [/QUOTE]