| all Franks suggestions could be valid. replace carb mounts for inlet manifolds.............
Only other thing that springs to mind is the tank breather?? Petrol starvation under load? weak running on over run etc. The cap was cleaned when the tank was swapped after imploding, could be something??
Is the fuel low? does it get any better on a full tank? Try lifting the filler cap after a run and listen for a "sharp intake of breath". |