Topic: Head gasket

[knutsi]

Hello, I have reassembled the top end of my CB350F. Upon assembly, I reused the head gasket, but have now lost compression on all cylinders. Question is, could it be the old gasket leaking? should I have installed a new gasket? or is it ok to reuse the old?

[69cb750]

Replace all used gaskets.

[bryanj]

Neverok to reuse head or base gaskets

[robvangulik]

You should always replace gaskets, but a used gasket is not likely the cause of 100% compression loss. More likely you have the cam timed 180* out.

Remove the tapper covers and double check your valve adjustments. I’d suspect they’re off.

The cam 180° out doesn't matter, that is either 1 or 4 at compression TDC.

[jonda500]

Neverok to reuse head or base gaskets

each to their own - if the gasket isn't ancient and comes off clean without separating, I will always reuse it unless someone is offering to supply me oem gaskets free of charge?
The o rings are more important if you want to replace something as they hold the oil pressure in
John