after approcimately 3-hours continuous mx woods riding, i have to adjust the chain. it seems to slacken quite easily. i know stock non o-ring chain is real crappy stuff. question is, does this adjustment interval seem to often? also, since i have approximately 30 hours of time on the stock sprockets, could the chain be replaced with a better o-ring type without premature wear? the sprockets look to be in good shape.