The previous owner put an after market exhaust on it but other than that I don’t think it has anything else. The air filter on the carb is the small silver metal one. I think that’s aftermarket but it could stock. I haven’t cleaned the little square oil filter on the bottom of the engine yet cause I couldn’t get the peg assembly off. I didn’t have the right tool but I did an oil change the bike says see15w-30 but I put 10w 40Is the bike stock or do you know if the previous own screwed with the jetting? If everything is stock you shouldn’t need jetting. Matter of fact if everything is stock it should be running on the leaner side not rich. Try cleaning first before buying jets. Something is stuck open causing the fuel dump. Could also be the choke being stuck.