CB750...Making pods work
bill
that in all of
his dealing with pod filters, could never get the jetting quite right.
After putting pods on
my 750, i always had a problem miss/hesitation at hiway speed, no
amount of jetting up
or down and tweaking the needle height, float levels or anything cured
it.
One (cold) day i noticed that when i tucked my knees in close it ran
better, and moving my hand
around by the filters, at speed, could make it run good or bad by
directing the airflow...
Got so pissed that i tore the pods off and went to reinstall the
stock airbox. It no longer would fit due to frame mods, so i pulled
out the rubber intake runners from it, put them on by themselves
with no filters, and it ran perfectly at any speed!! Moving a hand
near the carbs no longer had any effect. By cutting off some of the
flare on the intake runners, the pods fit on the runner where
they originally entered the airbox.
http://www.vinmoto.org/gallery/v/VinMoto-Events-Pictures/ChiVin-Events/album11/TWALD+09/twaldorama09/TWALD_09_kwl_067.jpg.html
.
You can see in the pic that they are spaced back a bit.
The reason this works and the problem with pods directly on the
carbs is that at
cruising speed the slides are barely up, and the idle circuit in the
carb is in play. A cross
wind at the mouth of the carb disturbs the flow into the idle air
passage, causing the
cylinder to run unevenly...
Mike
jetting except perhaps the needles. Any K&N pod style filter is available
from us as well.
After 30+ years of fixing and tuning motorcycles you definitely have to
recalibrate the carbs after altering the flow/velocity characteristics of
the intake system, and a simple filter change can do that. I use a three
gas exhaust analyzer to see exactly what happens to the state of tune when
things are tweaked and is really the only scientific way of tuning a bike,
other than measuring exhaust and combustion temps.
Brad, if you want to put some pods on then I'd be happy to help you out and
dial things in with the gas analyzer. Sometimes there are aftermarket jet
kits available from people who have already spent the time with a dyno and
gas analyzer and put together the optimum jetting package, however there
still is no such thing as an "all inclusive" jet kit. That is why there
will always be tweaking to take into account all the specific variables in
every persons particular bike/environment combination. This is why all of
our carburetor kits come with extra jetting even though they are pre-jetted,
because some sort of fine tuning is almost always required.
Mike
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Moped Graham
Do you guys have a dyno? You're the 'power barn' person right?
What kind of rates if so? Will you let me blow nasty, oily 2-smoke
through your EGA?
G