Torque Tables

I recommend checking bolts periodically for vibration loosening, and often refer to the Zenoah RC engine product manuals and their torque tables.  I trust these values for securing fasteners while minimizing the risk of overtightening.

Dry tightening torque values provided below in inch-pounds.

When a bolt is lubricated, less torque is required to achieve the desired bolt load or tension.  If you are using Loctite on your fasteners, refer to the wet torque value in parentheses ( ), which is approximately 20% lower than the dry torque value. 

Carburetor Bolts - M5 - 31 (25)
Cylinder Bolts - M5 - 65 (52)
Crankcase Bolts - M5 - 60 (48)
Spark Plug - M10 - 95
Exhaust Bolts - M5 - 80 (64)
Fan Cover bolts - M5 - 35 (28)
Ignition Coil - M4 - 30 (24)
MBP Fan Cover Coil - M5 - 65 (52)