old as dirt wrote:
your good just JAM the hell out of em. hammer them in call it good, all those good things like that, no worries, those piaggio engineers don't have a frickin clue on specs and what's needed.
tech tip: power tools make installing spark plugs much easier, just sayin.
Most people that have done a lot of bolting up have a pretty good feel for torque. If you know where the wrench clicks every time pretty soon you can feel it coming and you can get damn close with the same size breaker bar.
I would venture to guess that it is entirely possible to estimate torque while using something you are very familiar with like for example the Makita impact drivers I have used so much...
A lot of nuts will go pretty easy until they get to that critical point where they tighten up...if you don't break them there and don't just "hammer down" on the impact driver pretty good chance you are just about right in my opinion.
I did a lot of skidmore testing when I was at work. We measure with the skidmore the stretch of the bolt, the tension on it. See torque is not the important thing in a nut and bolt fastener tension is. Very difficult to measure tension in the field so we use torque because we can measure that. Also the torque to tension relation varies greatly depending on condition of threads, cleanliness and lubrication frinstance...
And the thing with bolting up to a certain torque again if you are familiar with the tool and stop when it tightens up you probably haven't overtightened.
Tierney is absolutely correct in stating the right way to do it is impact for dismantle and wrench by hand to install.