What torque should head bolts be tightened to?

The correct torque for head bolts is important because it ensures that the cylinder head is securely fastened to the engine block and creates a proper seal for combustion. Tightening head bolts to the specified torque value allows for even distribution of the clamping force, which is critical to prevent leaks and engine damage caused by overheating or warping of the cylinder head.

In this case, tightening to 210 in-lbs is appropriate for many small engines, as it strikes a balance between being tight enough to maintain a seal but not so tight that it risks stripping the threads or cracking the head. Proper torque specifications are essential for maintaining engine integrity and performance, showing why 210 in-lbs is the correct choice in this context.

Other torque values may not be suitable for the specific small motor in question. For instance, values that are too low may not secure the head properly, resulting in leaks or mechanical failure, while excessively high values could lead to damage. Proper adherence to manufacturer specifications is essential in all mechanical practices.