Manuals
Warning: Use these values, manuals, and charts at your own risk. They are general guidelines only. Always use your own manual as the definitive source. Consult with a qualified mechanic if there is any doubt.
The following chart is for when specific application torque values are not available. If it is not an unusual bolt or nut these settings can generally be applied. The fasteners are identified by their thread diameter in mm's, that is the number of millimeters across the thread. This is standard for Chinese scooters, a M5 bolt is 5 mm's across the thread. A flanged bolt has a circular flat surface under the bolt head, sometimes serrated, and often a washer or lock is not used, use the conversion site below if needed:
| Bolt/Nut | ft. lbs. | |
| M5 | 3.70 | |
| M6 | 7.38 | (flanged 8.86 ft-lbs) |
| M8 | 15.87 | (flanged 19.92 ft-lbs) |
| M10 | 25.80 | (flanged 29.52 ft-lbs) |
| M12 | 40.59 |
The manuals in the following links have torque values for specific applications. They may need to be converted for use on your tools. The following site has a handy conversion program for entering the value you find and changing it to what you need on your torque wrench:
http://www.pitt.edu/~rsup/touqueconv.html
Now we'll have some links to PDF's that are probably familiar to everybody but handy to have in one spot, some of these are large files and may take a while to download, please be patient:
Here is the Arrow Manual, as with all Chinese references, most of it will look similar to your machine, but you may need to adapt to your particular scoot:
Next is the Tank Manual, even though they are out of business there are still many on the street and this is a great reference. I personally used the carb diagram to tear apart and clean mine; you have to pay close attention, but all the parts are there. Enjoy:
The GY6 Manual is a good go to go to for the QMB139 engine but it's applicable to all GY6's:
The 50-150cc Manual is a decent all around service reference:
The mighty Scoot Dawg owner's manual:
This is a decent troubleshooting flow chart, much more straight forward than the Arrow. A more comprehensive chart is in the works but this should help for now: