SOHC.co.uk Forums > CB350/400

Compression loss and rough running.... Saga

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Clem2112:

I will check the valve clearances again.   
As well as checking the earthing etc .. although the starter spins well so the main frame/engine to battery earth strap must be ok?

Will also change the plugs to D8EA ie without resistors.
Currently I have Iridiums which have internal resistors -   some say that 5K caps and R plugs is not good for the spark.....??

Clem2112:
Well it's not the spark plugs. D8EA's made no difference.
Still haven't learned how the compression can drop on the outer cylinders once things are hot.
Has to be head gasket ?

Johnwebley:

--- Quote from: Clem2112 on July 05, 2016, 09:16:42 PM ---Well it's not the spark plugs. D8EA's made no difference.
Still haven't learned how the compression can drop on the outer cylinders once things are hot.
Has to be head gasket ?

--- End quote ---

 does the engine leak oil  from the head Gasket area?

 

Clem2112:
No...dry all the way round. 
My original 400/4 did though.... down the LHS but it still ran ok.

Couldn't the seal fail between cylinders?

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