I just picked up a 2000 xr50 that has been sitting for about 3-4 years. i cleaned the carb and the gas tank TWICE, changed the fuel line, addded an inline fuel filter,new plug,cleaned and changed air box and filter ,etc.The problem now is that the bike dosent run good,when i give it gas from an idle speed it bogs and wants to shut off. also the flat head screw under the idle mixture screw doesnt do anything to the bike. also when i put in gear it just wants to take off doesnt sit like an automatic,could this be a clutch issue. what else could i try to make this little beast run better.i thought about cutting off the spark arrestor but wasnt sure if it would cure it or help.(it will only be used in the yard to follow my 4 year old or for him to ride). any good advice please let me know thanks.