[NSRCA-discussion] OS120AX Run/Set-Up Problem

[Jay Marshall]

I just went thru the same problem with a new OS 90FX and Perry pump. I ended
up setting up everything without the pump in line, then connecting the pump,
with low pressure, and re-setting. I ended up turning the low speed setting
on the OS in almost two turns, but it worked!

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Pete Cosky
Sent: Tuesday, September 12, 2006 3:24 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] OS120AX Run/Set-Up Problem

Bill,

I had a similar issue with a VP-30 on a ST2300 and I had the Perry pump carb

on it as well. I was told by Perry to put a T in the line and return unused 
fuel to the tank. Haven't done it as of yet but haven't had time to play 
airplane much this year either.

As for the starter, I bought a gear reduction starter of Ron Van Putte and 
have my Sullivan sitting on the shelf. The gear reduction starter was less 
that $50 if memory serves correctly and I use a small gelled electrolyte 12v

battery to run it. No issues starting anything up to and including a Moki 
1.8.

Pete

----- Original Message ----- 
From: "Bill Markovitz" <wdmarko at yahoo.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, September 12, 2006 2:35
Subject: [NSRCA-discussion] OS120AX Run/Set-Up Problem


> HI....I have a new OS120AX that I put in a Quest
> airplane.  The engine is mounted inverted.  The fuel
> tank is at the airplane CG and I'm using a VP-30 Perry
> regulataing punp.  I have the low end needle valve (OS
> calls it the mixture control valve) at it's maximun
> lean position, but it isn't lean enough.  I had the
> same problem with an OS50SX and fixed the problem by
> modifying the low end needle valve so that it could be
> adjusted beyound the designed maximum lean position.
> The 120 is a different design and cannot be fixed the
> same way.  The basic problem is that the Perry pump is
> putting out too much pressure at the minimum presssure
> setting and this results in too much fuel being
> delivered at idle.  If the taper on the main needle
> valve was changed to allow it to engage deeper into
> the mixture control valve at the idle setting, this
> would fix the problem, however, I'm not sure I could
> accurately and precisely change the taper.  Any
> suggestions?
>
> Also, my starter doesn't have enough torque to turn
> over the 120, so I have been starting it by hand.  The
> problem here is that I cannot start it with the engine
> inverted.  The fuel just drips out of the carburator
> (onto the ground) and is not sucked into the engine.
> When I turn the airplane up side down it consistently
> starts with the first flip.  Obviously I need a higher
> torque starter so that a higher turning rate (RPM)
> will develop the sucking powrer to pull the fuel into
> the engine.  Any suggestions on a starter that will do
> the job?
>
> Thanks in advance for your help.
>
> ...................Bill    :(
>
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