Correction on some of the points and opinions here:
Octane number: Yes the chemical octane rating as in Researched Octane Number or RON of the fuel doesn't change. But we are looking at what is being combusted here - the air/fuel mixture, not just the fuel, so RON is not applicable here. It's the Motor Ron Number or MON that matters here.
Contamination from combustion by product is known to decrease the MON of the air/fuel mixture making it easier to self-detonate upon compression.
In Izso's case, he was experiencing a slight amount of knocking with the large overlapping + RON95 fuel. Swapping to RON97 eliminates the knocking thus the engine works better and healthier.
How you tell if it knocks? You can hear it, trust me.
Ignition timing: this engine is crank-referred and it has an electronic ignition system. Whatever he did on the camshaft DIDN'T change the ignition timing. He's pointed out that the only way to adjust the ignition timing (without resorting a new management system) is by modifying the crank sensor bracket, like what I did
here.
Tappet clearance adjustment: all you need are a good 12mm close-ring spanner, a flat-head screw driver, good ears and good eyes. Feeler gauge? I keep that in the closet and never use it for long enough that it some how rusted.
---------- Post added at 04:11 PM ---------- 6 hour anti-bump limit - Previous post was at 04:07 PM ----------
OT: izso, next time don't shot my side face, about 45 degrees to the side is the best angle. OK?
---------- Post added at 04:19 PM ---------- 6 hour anti-bump limit - Previous post was at 04:11 PM ----------
OOT: your bracelet in the second photo..... "-_-
Dude, I even have my watch removed before I worked on your engine so next time don't wear anything like ring, bracelet or watch while working on the engine. It's not good to show a bad example hehe!! XD