Re: O.S. .46AX Tuning
- From: "Mr Akimoto" <Mr_Akimoto@xxxxxxxxxx>
- Date: 30 Aug 2005 17:59:04 -0700
What you need to remember is the functions of the needle valve and the
mixture control (you do have the manual?). The needle valve handles
only the high speed setting while the mixture takes care of the idle
and the intermediate range.
OS says to quickly run up the engine. If it should stumble, then adjust
the mixture. What I have found is OS engine need to be run up slowly a
couple of times (sort of like clearing the carb out), before the
throttle can be rapidly opened or closed.
A very good idea is to leave the mixture alone. I have always found the
factory setting is good enough. If you screw with it, you'll be
screwing with it for a long time. Hopefully, the previous owner didn't
touch it.
According to what you have said, you haven't adjusted the needle valve
correctly. Back it out 1.5 turns from a seated position. Start the
engine and run it up. Each time turn it in a couple of clicks and
detect the change in RPM. Repeat this until you reach the point of
maximum RPM (or past it where the engine just begins to stumble), then
back the NV out about five clicks.
Now check that the engine transitions smoothly from idle to full bore.
If it doesn't, then you'll have to adjust the mixture. OS has a flow
chart in the manual of this proceedure, and I pity anyone who attempts
to follow it. It does work, but it takes a lot of patience and an
afternoon. Don't forget to run it up slowly a couple of times before
you try a quick throttle change.
Ciao,
Mr Akimoto
.
- References:
- O.S. .46AX Tuning
- From: Patrick Johnson
- O.S. .46AX Tuning
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