i just bought an 05 660. it has the stock chain on it. the chain was very loose when i bought it. i was going to tighten it, but i thought id take it off, clean it, and throw it in a pail of oil over night. well, couldnt find a master link. after doing a search on the site, i found they do not come with a master link in it. so my question is, are they any disadvantages to putting one in? i grew up farming, and i never had any trouble with them on farm equipment, so im assuming i wouldnt on the 4 wheeler either. but i just thought id ask.