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john charlton · 09-29-2020, 08:10 AM

No resolution as yet I have done the trick of holding no 4 lead off to induce a hotter spark but no change and I have swapped plugs about and tried different plugs .A previous post suggests a sticky valve . Got to thinking that the valve seats at cranking speed hence good compression but does not at idling speed . Next trick will be to do a compression test with the engine running on 1,2 and 3 hopefully low compression revealed if good compression its got me beat !!! I will let you know .So far swapped carbs ,distributer new gaskets on manifold plugs etc etc .

John in same place same weather .

09-29-2020, 08:10 AM	#12
john charlton Senior Member Join Date: May 2010 Posts: 1,304	Re: Mystery missfire . No resolution as yet I have done the trick of holding no 4 lead off to induce a hotter spark but no change and I have swapped plugs about and tried different plugs .A previous post suggests a sticky valve . Got to thinking that the valve seats at cranking speed hence good compression but does not at idling speed . Next trick will be to do a compression test with the engine running on 1,2 and 3 hopefully low compression revealed if good compression its got me beat !!! I will let you know .So far swapped carbs ,distributer new gaskets on manifold plugs etc etc . John in same place same weather .