Currently running a 1916, 120 engle, 042 heads, Dellorto's and all that jaz.


The problem I have is it's developed a miss / backfire / pop, which occurs from about 1900- 2500 rpm ish, when only slightly underloand. But dosent's do it at all when giving it a little. I've checked all the obvious things I can think off.

Added fuel carby cleaner.
New leads
Checked points 0.016
Checked timing 10 deg adv
Adjusted Tappets took them from 0.004 to 0.006
Changed plugs


Any suggestions ?

I know it's going to se somthing stupid, I can feel it.

check the carbies and mainifolds to see if there all tight and sitting correctly you may be sucking air

Thanks guys, I'll change the gaskets on the maniflods and see how we go.

Thanks Dave

Turned out to be a split in the manifold gasket.

man the combined know on this site is priceless