RE: OS Max III and Quaker

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Mike R - 31 Mar 2006 00:15 GMT

I checked out the .15 OS Max III I picked up at a swap meet for my
Quaker. After a bit of coaxing I got it to run. It responds to high end
adjustment well and transtions ok from idle to full throttle. One
problem I had and this was my fault, is that I should of backed out the
idle screw so that I could fully close the throttle to shut her down. I
covered the throat with my finger and it still would not shut down just
kept idling. Is there a problem here or is it because the air bleed
needle is backed out far???? Also I have a few questions:

1 I was using 10% nitro and my club is selling 15% ( said it was good
for 2 and 4 strokes).....what nitro content would be good for this
engine??? Higher then 15??? Would a higher nitro content.help in ease
of starting and performance???

2 High speed adjustment should be to find max revs back off till it
runs rough than slightly lean it??? If I am correct these engines
should run rich due to them leaning out while inflight??

3 Glow Plugs: The LHS recomended OS A3 plug for lower nitro
content. I would assume hotter weather and/or higher nitro one would
need there cooler plugs????
What would you recomend???

Thanks
Mike R

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Bill Fulmer - 31 Mar 2006 00:47 GMT

Sounds as if the o-ring at the carb's base is damaged or missing. I have
also seen OS engines that have the carbs held in by two screws with a
missing screw. This will cause a very large air leak....

1. Smaller engines such as the .15 will run on 10%, but generally will do
better on the 15% fuel.

2. Peak the high speed needle, then richen slightly to set the high end..
RPM should not fall of when nose of model is raised..

3. There is a plethora of glow plugs available. In actuality, a mild sport
engine such as this will not be too critical of plugs, The OS A-3 should
work fine har. My personal preference for all sport 2-strokes is the OS
#8.. A bit costly, but they seem to last forever, as long as they're not
run too lean. This will kill ANY plug (and engine) in short order.

Bill

> I checked out the .15 OS Max III I picked up at a swap meet for my
> Quaker. After a bit of coaxing I got it to run. It responds to high end
[quoted text clipped - 21 lines]
> Thanks
> Mike R

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desmobob - 31 Mar 2006 02:06 GMT

> 3 Glow Plugs: The LHS recomended OS A3 plug for lower nitro
> content. I would assume hotter weather and/or higher nitro one would
> need there cooler plugs????
> What would you recomend???

Go right to the horse's mouth, so to speak.... (and me, at the other end of
the horse, recommends the A3)

http://www.osengines.com/accys/choosing-glowplugs.html

Good flying,
desmobob

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Model Forum / Radio Controlled / Air Models / March 2006

RE: OS Max III and Quaker