Okay, so I'm new to this website, and I was looking for some possible answers to my problem for my recent motorized bike build. I have had this build up and running plenty of times, and everything checks out. No leaks, no broken parts, and it idles fine; however, it cannot go above 20 mph. When I approach 21-22 mph, it forcibly slows down, and this is due to the chain tensioner not moving. This is because in order for me to get it aligned, I had to wedge some metal where the nut goes. Putting this now not-so-relevant information aside, I decided to just go without a chain tensioner, because it has been nothing but trouble. Now I have a new problem, the chain is much too loose, with around 3 inches of slack. Of course, I tried cutting down the chain just one link, and it was suddenly too tight to close, no matter what I tried. The wheel cannot be pushed back, as it is vertically taken out of the bike. If someone could please suggest anything to help, maybe a certain tensioner that doesn't cause a ton of frustration, or a way to get the chain the exact length, I would greatly appreciate it. I am able to send as many pictures as needed.