O.S. 3.5 Outboard!

Grimracer said:

Bill,

50 to 60 is fine... (18 or more percent oil, based on viscosity)

I like a 1440, back cut 17 deg and set to 2.9 cup... BUT.. your boat will tell you what you want. The Grimracer 40x52/3 also works quite well.

I use Grimracer Speed Grease after 5 rounds and just run the extra pressure tap to the shaft nipple.

TUNE THE LOW SPEED NEEDLE.. DO NOT CUT IT OFF... (just trust me on this one).. this goes for ANY motor ..if it has a low speed needle,, TUNE IT!

AVOID a set up that allows you to run WFO for the entire lap.. Set the boat up so you have to use the throttle.

Grim

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Bill Gibson said:

Never had one until now! Its hanging one the back of my G30! I wanted to know:
What percentage of nitro is good to run it on? It will be raced!
Whats a good prop to use?
What do i use to lubricate the flex shaft? I see a fitting on the right side of the lower unit, so i assume thats where the lubricant goes!
Any other advice would be greatly appreciated! thanks!

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Bill Gibson said:

Never had one until now! Its hanging one the back of my G30! I wanted to know:
What percentage of nitro is good to run it on? It will be raced!
Whats a good prop to use?
What do i use to lubricate the flex shaft? I see a fitting on the right side of the lower unit, so i assume thats where the lubricant goes!
Any other advice would be greatly appreciated! thanks!

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Grimracer said:

Kris, Pinch test the low speed.. there are a bunch of videos on that out there. (it will get you close)

Over last number of years I have been using the OS#8 plug in the motor.. (wont be switching anytime soon!)

Grim

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Alan Elzer said:

Run 60% at least with anyones factory blend of oil, we found years ago with 2 identical boats, props & motors that 50% sags coming off the corners & 60 doesn't. These were tested with k&B 21's on the tri-star hulls & I did the props so I knew everything was the same. Props a 40x52 (2) blade or X437/3 let it wind up you'll be fine.

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Brian Sorgente said:

Looks like folks have you covered on the other stuff. As for flex shaft lube, go to your auto parts store and get one of those little thumb pump oil cans. Clean it out and fill it with straight castor oil. You can find it at pretty much any pharmacy, which is really convenient for this. People will tell you all sorts of oil mixes but this is simple and has worked great for me over the years.

On the OS lower I put a short piece of water tubing on the side nipple that extends about an 1/8" or past the end. That's so you can push the nose of the oiler into the fitting and seal it while you're pumping without making a mess. Pump it in until you can feel some light pressure and its ready for one run on the water. If you do this every time your flex and prop shafts will last a very long time. I also fill it at the end of the day to keep them from rusting inside. If you don't like the oil can, you could also mount an oiler to the side as well.

Brian

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Bill Gibson said:

Mike i believe thats the plug i use in my O.S. .32 Heli engine for my Concept DX!

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BruceHartmann said:

I use #8's in all my helis and 2 stroke planes. Haven't had one go bad on it's own in years. They only go bad when I plug them into the 12v side of the power panel.

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Tom Foley said:

Most of all Bill ..
HOLD IT WIDE OPEN!!!!

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Bill Gibson said:

OK HIPSTER! Will do!!

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