With no manual to know for sure I ck valve set no lash on intake adjusted to .oo7- ex had a small amount of lash went to same .oo7 looked for carb adjustments did not find any right away except idle adj pulled spark plug looks good. I understand the oil filter is on right side behind the 3 bolt cover is this correct. Any other tune up info will be put to good use.Welcome to the forum... I ride a 91 250X what do you need to know?