idle mixture adjustments with dynojet kit
Posted: Tue Oct 17, 2000 3:35 pm
Hello Gang:
I recently installed a Dynojet Kit, and ISD2 exhaust on my A15. No
real problems with either. I cut the rear muffler spacer (supplied
by Supertrapp) down to about 5/8". It was 1 1/2" originally. At
5/8", it centered the pipe between the fender and side cover and
generally fit better. I was astounded to find that the front carb
clamp had never been installed.
Dynojet suggests that the idle mixture screw be set at 3 1/2 turns
out. I thought this was extreme and set mine at 2 1/2. After
putting a couple of hundred miles on the setup, I got around to
checking my exhaust levels. I was running over 4% CO (carbon
monoxide). High CO is a result of rich air/fuel mixture. Most non-
catalytic vehicles are generally happiest with CO running 2% and
lower. I ended up somewhere around 1 1/2 turns out. My final
reading was about 1.5% CO and HC (hydrocarbons) of about 80 parts per
million.
With the new setting, idle is crisper and and off idle acceleration
is crisper. It doesn't sound or feel as "mushy". The next time I'm
fooling around with the carb, I will count the turns and report it if
anybody is interested.
Ron