Tightening the spark plugs

[BBROWN1664]

torque them up to the correct torque listed on the plug manufacturers website

The only spark plugs I have ever used a torque wrench on were fitted to aircraft engines and were even lock wired into place after torqueing up.
On cars and bikes, especially where access is awkward, finger tight then 1/4-1/2 a turn has always worked and is what it says on most plug boxes.