Home of vortex tuning
Join Date: Nov 2007
Location: Spearfish, SD, USA
I'm not familiar with the spark and carbs of Ducatis, my general logic thinks too much advance will cause backfires, firing way before top dead center with maybe a valve open due to overlap, long duration, top end power, cam grind. Cam timing ok? Retarded will create excessive heat up in the rev range, & power flattens out, but easier to start. Over sized (low vacuum to pull fuel) or stock carbs? So many variables, enrichener (choke), slide cut (angle), needle shape (taper), jets (pilot and main) accelerator pump (if equipped), and idle air screw. I've used a sewing needle to clean out jets until I could see light thru them, body soaked in carb cleaner? How does it idle when warm? Spit on throttle application? How strong is your spark? High comp will affect the spark kernel & may tend to blow a weak spark out, strong coils, good wires, iridium plugs? Old gas? I have been surprised on how well the carb worked after I fixed a weak spark; TT 500, '65 XKE, fatboy, tiger cubs, & every used vehicle I bought needed some carb TLC
Chip Tank in Calistoga Ca.
Hammerin' Honda 90's 'round Lake Berryessa since '67