Can someone clarify something for me...
The CCT is weak point in my very limited opinion and knowledge base. A couple of cct's have given up the ghost, and in turn bent valves.
the stock CCT is noisy at startup before oil reaches it, and then it's good to go, but I still don't trust it. So I've replaced mine with a manual CCT. Cheap, and easy to adjust/service.
Now, why change the chain? If it streches, the OEM cct will take up the slack, and the manual CCT (me ::025:
, will give it a turn or two, and that's that. What's the likely hood of the chain actually snapping? So if you're replacing the chain, are you going to swap the two cam sprockets, and bottom sprocket as well?
Maybe if you bagged the bike, and rode it like a complete muppet for 200xxx km, then yes maybe, but I think this motor is overbuilt, and so is the chain.
I'm hard on my bike (throttle wise, maintanance schedule is followed over and above recommended), and 5 of the 8 valves were tight on my motor ( 4 ex., one intake) at 42km.
My buddy who's slightly easier on his, decided to hold off on the valve check till 59km, and 2 out of 8 were tight (both exhausts).
So for the guys that check their valves and are within spec.. why bother with the chain, and sprockets? If we second guess the yamaha boffins that eat, breathe and crap Yamaha...we would be changing everything on this bike.
I for one will
only be changing the oem cct, and clutch basket (2014), and flashing the ecu, and the exhaust is gone, and the stock bars and the big floppy turn signals.....damn.
Curious minds want to know...