Re: 2 Questions....
I had the same issue on the hesitation at about 4500 RPM.
Cured it by loosening the valve lash just a little and bigger squirters in the carb which was a 2 circuit holley.
If you have a three circuit carb you might also try a smaller air bleed in the intermediate circuit.
I believe my issue was with the valve lash was too tight when the engine was not warmed up good yet at the stage process time. Mine did not stumble once the engine was good and hot. I always have it at least 170 degrees at the stage time now to avoid the stumble.
On the tire shake if it is a hard tail air pressure is about all you can change.
If it is a 4 link soften it up a bunch and that will cure the shake.
Hope you cure both issues and good luck.
Rick Cates
|