I'm not up to speed on these bike conversions - but I do work with chain from time to time
If that chain had an extra link in it , I am sure they would touch below the tensioner when stretched a bit
chains do stretch quite a bit , even the pre-streched ones , I think it will be ok
also remember sprockets wear as well
esp as the chain is under more load than when on a bike (a car is more weight)
the above is just my opinion
ps would be nice to get a cover over it , so it don't plaster everything with chain oil
edit - another possibility is to get a shorter spring with approx the same force on the tensioner -
so it doesn't become spring bound & you can change when the chain is run in a bit
it does look like you have used the full adjustment range on the arm - I can't see how you could do it differently with what was provided
also - I'm sure it is just the pic - but that remote oil filter looks close
I assume you are not having an electric reverse ? or is that fitted another way ?
Edited by sledgehammer, 14 January 2018 - 07:08 PM.