SOHC.co.uk Forums > CB350/400

compression test.

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ka-ja:
Balanced crank, rods, gas flowed head (26mm inlet tracts) Yoshi camshaft and HD cam chain. I have now found a damaged gasket on one of the carbs, could be the carburation problem, but the original question still stands, is the compression good enough.Test lead is about 320 mm long.

SteveD CB500K0:
What’s the compression ratio supposed to be?

400/4 is 9.2:1


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ka-ja:
Not sure of the compression ratio, it is 35+yrs since I bought them.

Andych:
Leak-down test might be the better option. It will give you better diagnostics on any issues..
I would think that those pressures wouldnt be too bad considering the length of hose from the fitting to the gauge.

THUNDERDOWNUNDER:
When I checked my compression not  long back it wasn’t in the 150s  you got me worried now ! And my 400/4 is just standard . No fancy bits Agh !

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