flywheel weights, I plan on adding a flywheel weight to my yz250 2006 model with a 51 tooth sprocket. I ride trails, single track, sometimes technical, sometimes flowing trails and somewhere between the two there are lots of rollie type rocks. The bike will probably never be ridden on a groomed track. The question I have, is what weight is better? A whole flywheel or add-on weight? My reasoning is the closer the weight to the bearing inside, the less stress on the bearing and internals, (with a whole flywheel) Which is better? Is there a difference? All the brands are the same, just adds weight, right? Ease of installation?