This is a final version for production.
Compared to version that is in my engine there are two differences.
1. There are two M8 bolts for upper slider. That means mounting of upper slider will demand just 2 holes in upper case instead of 4 in previous version.
2. Lock mechanism of lower tensioner is added for when torque is reversed. This is not just simple lock mechanism. I added Polyurethane Spring rubber(brown in images) of 90 Shore to act as spring when torque is revered. This rubber spring is adjustable in the sense that it can be changed without taking the engine apart. But it will demand taking out the pump probably. I don't think this mechanism is necessary, but some people with experience complained in this thread. So why not added it. If you want to completely lock tensioner you can replace rubber with piece of aluminum or whatever you prefer. With time as chain lengthens you will need to insert rubber with more thickness end so on. But that Polyurethane Spring rubber is not expensive...
This is expensive collection of parts and there is a lot of manual work involved. Material is expensive, PA46 etc.... A lot of complicated CNC, laser cutting, custom heat treated spring, heat treated axel, demands welding.... And do on....
I will offer to people now this tensioner system and if there is at least 5 people willing to pay in advance I will make just for them because this is expensive collection of parts like I said. Also I bagged my CNC shop to do this small series of parts like I am making 50 sets. I already invested so much money and personal time in to this primary system that I doubt that I will ever return my investment. But for love of cb750 and engineering here it is;)
Later on if somebody wants, this system can be made per one set. But price will be multiplied by factor of 2 at least.
This system will work only with straight plated, 68 links, HD chains. You can buy pair of HD chains directly from ebay for around 100eu or you can buy from somewhere else with multiply factor greater than.
The price is 350eu plus shipping 15eu(maybe it will be 8eu if I keep the weight below 1kg for package). You get everything in pictures expect the chains.
And sorry for not that high quality renderings