Alternator chain tensioner
 

Hello to all, a question...I just finished trying to install a new alternator on my beloved 1000F, while inside I inspected the tensioner, and all was well..fuddling around with the chain caused the tensioner to lift a couple clicks, therefore increasing the tension. I got the alternator assembly in place successfully ( the socket on the end of the shaft tip I got from here proved most beneficial!) and now the starter will not turn the engine over. The idler gear from the starter previously turned in one direction and had a tiny bit of play. Now the idler is immobile. Nothing has changed except the extra tension. Too much tension? Can you release the tensioner to gain some play without opening the engine cases? Any ideas? Thank you!

Sounds like it's too tight.
There is a way to loosen it which involves poking a piece of strong wire through a hole in the unit, although this isn't guaranteed. There is a report on how to do this in a post on replacing the starter damper, about a year ago. Suggest you do some searches.

I would also pull the alternator and make sure that it is seated correctly on the starter gear. I know when I went to re-install mine it was catching on that gear preventing it from moving. Hope this helps.