We have installed a new chain on honda TRX 90 2011 and the adjust screw is screwed in all the way but the chain is still loose ( the chain is the correct size for the atv) seems when they put the chain on maybe have not tightened or put the parts back in correctly I have searched everywhere for a video and or manual could not find anything for the atv Im trying to teach my 13 yr old to fix the atv himself and Im having a difficult time myself to find what the problem is is there anyone out there that could help. I tried to upload video and couldnt figure it out. tried uploading from my computer no luck

Thanks