Broken Cylinder bolt......?

[BostonBull]

I was using one of my saws last week when I heard a very high pitched ting. From then on the saw was running really lean and racing. I started looking for obvious stuff like an air leak or a bown top end etc etc.

I took the muffler off and sitting under it was a broken head bolt and one that had loosened and worked its way out. What would cause this?

Both bolts were from the two exhaust facing holes of the cylinder.

 

[A100HVA]

not being tight enough,or maybe vibration

 

[Lakeside53]

wrong torque and compression of a paper gasket, then one loose could break the other.

 

[BostonBull]

Lake.....
Do you use a TQ wrench on certain bolts? Or just head bolts? Or not at all?

Just curious if I should invest in one.

 

[Lakeside53]

All important bolts, like cylinder heads, muffler etc, the flywheel and clutch, and a few that are "delicate", like the 3.6 ft/lbs on the carb block mounts on a BR420... grrr...

You need two wrenches - 0-75ft lb and 0-12 ft lb.. or close...