Because it would be too easy. The whole thing about hydraulic tensioner is that they are suppose to adjust themselves. As soon as the chain pick up some slack the oil psi push the tensioner out. So if there's anything... the oem tensioner constantly put pressure on the chain for no reason. The manual cct is pretty much a long bolt and a jam nut. About as basic as a hammer and chisel! LOL But it work!!! IMO it doesn't add pressure to the chain on acceleration and when the bike get on decel (this is when the back side of the chain get under tension) it simply laid against the chain guide.Nice detailed write up Marthy,
Am I wrong in thinking that the original CCT design was intended to utilize the oil passage in order to increase tension on the chain as the engine speed increases? A dynamic tensioner so to speak?
With the APE tensioner it seems that the timing chain receives a consistent amount of tension regardless of the engine speed or engine temp.
Perhaps Yamaha wanted to avoid a consistent amount of tension on the timing chain in order to avoid pre-mature wear due to the way the timing chain metal expands and contracts during its heat cycles?
The Ape design seems simple and straight forward, why would Yamaha choose to go a more complex route utilizing the varying oil pressures created while the engine is running?