First, a little history: I purchased a used ’96 Fatboy HD a few years ago and inherited a D&D 2:2 slash cut exhaust. The only other thing done to the bike was a Dynojet kit. In the past couple of years I’ve added an EV-46 cam, 10:1pistons, and SE single fire ignition. The bike is making about 80 HP and 90 ft/lbs of torque.
Problem 1: I have always noted a tendency to surge and run rough at steady throttle or on compression when traveling around town (20-35 mph). Give it a little throttle and it was fine. It wasn’t bad, but noticeable. As I’ve made changes (especially after adding the cam) this has worsened to where I usually drive around town with my enrichner partially out, This helps but does not completely alleviate the problem. It’s worse in the winter.
I’ve had the bike into a couple of shops and it’s been dyno’d several times as I’ve made changes. They tell me it’s tuned correctly and the air fuel mixture is correct although there's a big dip at the low end. The dyno/shop folks tell me that's normal with the CV carb. The folks at Andrew’s cams suggested I get a better exhaust like Vance & Hines, Hooker, etc.
I’ve researched those exhausts and I do not see where they will improve my performance over the D&D exhaust I have now.
Do you have any recommendations?
Any help you can be with these questions will be appreciated. Thank you.
H-man
Problem 1: I have always noted a tendency to surge and run rough at steady throttle or on compression when traveling around town (20-35 mph). Give it a little throttle and it was fine. It wasn’t bad, but noticeable. As I’ve made changes (especially after adding the cam) this has worsened to where I usually drive around town with my enrichner partially out, This helps but does not completely alleviate the problem. It’s worse in the winter.
I’ve had the bike into a couple of shops and it’s been dyno’d several times as I’ve made changes. They tell me it’s tuned correctly and the air fuel mixture is correct although there's a big dip at the low end. The dyno/shop folks tell me that's normal with the CV carb. The folks at Andrew’s cams suggested I get a better exhaust like Vance & Hines, Hooker, etc.
I’ve researched those exhausts and I do not see where they will improve my performance over the D&D exhaust I have now.
Do you have any recommendations?
Any help you can be with these questions will be appreciated. Thank you.
H-man