i managed to shorten the chain one link by doing it with the tire off slid forward, but now the chain rubs agains the frame and falls off the sprocket.I have that spring tensioner. I got it at first because I was worried about the one that comes with the kit falling into my tire. The tensioner does not do a good job unless you got the chain pretty exact. I still use it as a secondary tensioner.
You can also adjust your engine mounting position, placing washers between the rear mount block and the engine case. That will bring your engine forward (compare to pulling the tire back 1/4"), and probably higher, giving that spring tensioner a better angle to work with.
After experience, the kit tensioner is fine and I no longer have a fear of it causing my demise.
well, i scrapped the idea of a spring tensioner. now, i think i'm gonna make a "original" design from this spring-tensioned one as the original one i have is mounted on another bike.
any suggestions on how to design it? (in a way it would be better than the original)?