there is no easy way as far as i know. i'm not sure whether your bike has an 'f-mark' on the flywheel to use as a rough guide, but as far as i know (never done it myself) it's something you do by feel. there are little guages out there, some work on with a strobe-light (sp?) and others with a tone, to help with fine-tuning, but i think that adjusting timing is a little more advanced than say cleaning your carb. good luck though! do you have a manual for your bike? if not then i'd suggest perusing the 'fred's guide' on the repair section of this site. it may be helpful.