Posted by Toni Nieminen on July 05, 2000 at 11:37:53:
In Reply to: OK now I'm Pissed posted by James L. deBoxtel on July 05, 2000 at 01:39:06:
I have main jet size +5 (160) and 6 disks.
I tried to run +10 size jet with 7 disks
(all that I got), but the engine didn't
accelerate strongly on the high revs and
discs were getting black. So I installed +5
size jet, but then the engine didn't feel
as smooth as before. Removed one disc,
and now it feels very good. No coloring on
the pipe, but the outermost disc has now
golden color.
You can pretty much see from the color of the
discs how is your mixture. If there is lot of
black deposit on the discs, you are running rich.
If the discs are turning blue, you are running
lean (outermost disc was dark blue before
rejetting). Golden color indicates that you are
getting close. But it is first better to make
engine run too rich and then slowly move to the
more leaner mixture. This also avoids coloration
of the muffler. It is also good to remember that
there has been changes in Savage's carburetor over
the years. Needle and jet sizes have changed many
times. So what works with me does not necessary
work with you.
Here is question from Supertrapp FAQ:
Q. How many diffuser discs should I run?
A. To assess the performance of any product that affects horsepower and
torque, lap times and dyno-runs are the best indicators. However, since
enthusiasts usually only have a "seat-of-the-pants" dyno, running condition
is the most obvious indicator. Attention should be paid to the coloration of
the discs. Little or no disc coloration would indicate a possible lean
condition, while black or sooty discs are indicative of a rich or oil burning
condition. Discs that turn a tan or golden color would illustrate an
acceptable balance of fuel mixture and exhaust flow.
Toni