I’ve rode this quad for years. It’s amazing, was my great grandfathers and he lives deep in gravel backroads right off of beaver lake in AK, my parents now have property down the road and if you know anything about the landscape around beaver lake it’s pretty wild. We work the crap out of this baby and she’s never done us wrong. Went to everything apart besides engine and chain, cleaned and replaced all brakes, brand new tires, new handle bar, long story short I’ve done a lot. The chain recently got loose out of nowhere and we’ve never had to tighten it before, it’s enclosed, my dad and I are torn in deep on it and we just stuck dead in the water. Can’t get it to tighten, nothing seems to work, and I’m sure a new chain and sprockets will be great for it but we still can’t get any type of small adjustment or progress as it sits, because need to know how to tighten it be we remove it completely. I’ve only seen like three used manuals for sale on eBay for these quads too and they range from 25-60$ in asking price I believe. Just a very sentimental quad to the family, my 88 year old great grandmother still sees the family ride the quad and put it to work. Runs great, but I have found absolutely zero info for anything at all on this, any help or information is much appreciated l.

Much appreciated. It’s a LT300E Quadrunner. I don’t know off the top of my head or that diagram if we have gotten into every one of those bolts. I am going to follow the steps you listed with the diagram next week. It appears to be the correct one from just the shape of the parts I see. I will post again if said steps fail and there might be a different problem, or I will post that I have succeeded. Again, thank you, been a struggle to get good info.