new here from nj

Hello,
Really glad to find this site! Was wandering if anyone has had chain troubles? I guess I dont really have problems but now that my motor is good and broken in my chain is sttreched and looks very unreliable! this is the third bike I had tyhe engine on and I had yo add a piece of chain couldnt find a place that had the right size master link so I got a size bigger its rigged like SHT but **** its really ridding smother then it ever has, I have rode like 13 miles each way without a prob but now it looks as though my chain is gonna break, I wish I could shorten up the drive stuff somehow?
Hope to hear some good ideas on hear and thanks whoever started this
Tom
Cape May, NJ

WOW, thanks guys for all the quick help!
I did just that but it came in two pieces , figured no biggie I made chains for my bikes when little with 20 master links but this!!!! I even bought one on the link seperators broke the first then bought and broke a 2nd! I fell I got all right put on the chain with the idler all the way don put on the chain put the idler allthe way back up and BAM way too loose, take one more link out and I cant even get it on without the idler what the **** am I doing wrong? Please if I ever needed\d help its now before I riddle this whole this with my shotgun!!
I mean dam, I rebuilt dirtbikes put car motors in even when I got this kit I though I was Mr. Mechanic but this chain is Kick'n my Ass! I with there were a way to pul the whole weel back like on a motor cycle to tighten chain casuse looking at it now, how did I do it in the first place? I did it! Ran really great for 4 months now something as simple as this has me ready to through in the towel HELP . HELP ,,Please,
Tom