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Thread: OS 90 FS Manual


  1. #1

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    OS 90 FS Manual

    I am looking for the owners manual for the OS 90FS 4 Stroke engine.
    Is there somewhere on line that I can download it?
    I tried the OS web site with no luck.
    Thanks
    Ray
    PS I am posting this on several sites here hoping one will work.

  2. #2

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    OS 90 FS Manual

    You should have tried harder. Here is the link where you can download the manual of any OS made engine:

    http://www.osengines.com/manuals/index.html

    Sašo

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    OS 90 FS Manual

    Thanks for your help, but, I still don't see the FS90 listed there.
    There are over 30 listed plus 3 carburator manuals but none for
    the FS 90.
    Sure hope my eyes aren't getting bad in my ole age.
    Ray

  4. #4

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    OS 90 FS Manual

    TRY EMAILING THEM. I WAS LOOKING FOR THE SAME MANUAL.
    SENT IN A REQUEST AND THEY CLAIMED NOT TO HAVE RECEIVED IT. NEXT THING I KNOW, I RECEIVED TWO. SOLD ONE OF THE ENGINES OR I WOULD MAIL IT TO YOU.

  5. #5

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    OS 90 FS Manual

    Hi!

    Just browse that list - you will notice a manual for OS FS-70SII, FS-91SII & FS-91SII-P. This is the one.

    It's a .91 not a .90 - that's what it is written on my OS .91 FS )

    Sašo

  6. #6

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    OS 90 FS Manual

    What I have is a FS 90 not 91. It is inscribed on the body of the engine in two different places.
    I guess an email to the company is the next best thing to do.
    Thanks to all for your help.
    Ray

  7. #7

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    OS 90 FS Manual

    ADD ON TO MY PREVIOUS MESSAGE.
    THERE IS A SPOT ON THEIR WEBSITE TO GO TO IF YOUR MANUAL IS NOT LISTED. THIS IS HOW I EMAILED THEM.
    GOOD LUCK !

  8. #8
    Moderator w8ye's Avatar
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    OS 90 FS Manual

    SETTING CAM TIMING ON A REAR CAM OS 60 OR 90
    Bill Baxter

    With the piston at Top Dead Center, you position the ring gear that's in the rear housing such that the embossed "dot" is straight up, towards the cylinder head.

    Look at the gear carefully. You'll see four things that look like the "dot". Three of them are the ends of the screws that hold the ring gear to the assembly, and between two of the screws is the "dot".

    You'll have to remove the small cover from the rear of the rear housing to hold the assembly to keep it from rotating.

    ADJUSTING VALVES
    From a thread on rcuniverse
    The original writer is unknown
    It is the best explanation I’ve seen

    Adjusting the Saito, Magnum, OS, ASP, or Y-S valves can be accomplished by anyone with the right directions. The valve clearance is the same for all of them. Here is the method I have been using with Saito and the other 4 stroke engines.

    Go to the auto parts store and get a blade type feeler gauge with .001, .002, .003 and .004 (one through 4 thousandth's INCH) blades. .002 is the minimum valve clearance and .004 is the maximum recommended by the manufacturers. I like to set to the minimum clearance so that the valve is open the maximum amount of time per cycle (more gas in, more exhaust out!).

    The engine must be absolutely cold (not run that day - room temperature is fine).

    Remove the valve cover(s). You may have to tap it (them) with the handle of a screwdriver to loosen them - pull it (them) off carefully, the gaskets (if present) can tear.

    Bring the piston to the top dead center (TDC) of the compression stroke. It’s very easy to feel. If you are not sure, rotate the prop counter-clockwise until you feel compression, then remove the glow plug and look to see when the piston is at the top of the stroke. If you can't see, insert a straw or small plastic tube (only) vertically into the glow plug hole and slowly rotate the prop counter-clockwise until you feel the piston is at the top of its stroke.

    Hold the prop at the exact position of TDC. It helps if you have 4 hands to do this job, but can be done with only 2. You should now be able to wiggle both rocker arms up and down a bit, as they should have some play.

    Do one rocker arm at a time. Complete one, then do the other.

    Using the tools, unscrew (counter-clockwise) the nut on top of the rocker arm about 1/2 turn. Leave the wrench on the nut.

    Insert your Allen wrench or screwdriver in the top of the adjustment screw on top of the rocker arm - this is the shaft, which the nut is tightened onto. If you have an older engine, it will have a small straight screwdriver slot instead of an Allen wrench fitting. It helps if the wrenches are just about even with each other when loosened so you can hold them with one hand.

    Open your feeler gauge and spread out blades .001, .002 and .003. Make sure no other blades are sticking to them! Fold all the others back into the handle.

    Looking directly at the junction between the rocker shaft and valve stem, try to insert the .002 blade between the rocker arm and the valve stem shaft. I use the side of the blade, but some folks prefer the end of the blade. If you cannot slide it in, turn the Allen wrench or screwdriver counterclockwise a 1/4 turn, and press down on the push rod end of the shaft (the one with the nut on it) with just light finger pressure until you can slide the blade into the gap. Don't open the gap too much, or the push rod can slide out of the socket on the bottom of the rocker arm. If that happens, just re-center it and continue.

    Hold the nut in place with the wrench, and turn the Allen wrench or screwdriver slowly (small amounts!) clockwise while sliding the .002 blade back and forth between the rocker arm and valve stem. When you have a very slight drag (Very Slight!) on the .002 blade, hold the Allen wrench or screwdriver in that exact position and tighten the nut down. Doesn't take a lot of pressure. Use a fingertip only at the end of the wrench to tighten the nut snugly. Remove the Allen wrench or screwdriver and nut the drive wrench. Check again with the .002 blade for a very slight drag.

    Now, rotate the crankshaft two complete turns so that you are exactly at top dead center on the compression stroke again. Recheck your gap. The .001 should slide easily in and out without any pressure. The .003 should not fit, but may if you press hard, because it will cause the valve stem to open the valve slightly. The .002 should fit exactly with a very slight drag. If not correct, and repeat the procedure. A little practice here and you will have it down! Don't use much pressure fitting the blades, they are thin enough to slice your fingers!

    Do the other rocker arm.

    While the covers are off, use a small screwdriver to check that the shafts on which the rocker arms rock are tight - again, not much pressure here.

    Oil the assembly before putting the covers back on.

    Turn the engine upside down and put a drop of oil on:
    the contact point between each rocker arm/valve stem,
    the contact point between each rocker arm/push rod,

    Tilt the engine sideways - put a drop of oil on each valve stem shaft through the spring - don't touch the spring, just let it drip through so the valve stem seal on the head will be lubed during the next step.

    Turn the engine upright: Put a drop of oil on each side of the rocker arm where it rides on the rocker shaft. Finally, put 4-5 drops down each push rod tube. Put the covers back on. You're done. Do about once a year or 10 hours flying time on the engine.

    Do the lubing before starting the engine anytime it has not been run for more than a month. Squirt several drops into the crankcase drain nipple and move the engine around to get the oil into the bearing at the same time. I use a 50/50 mix of Marvel Mystery oil and automatic transmission fluid for my lube oil.

    I hope this has not been too basic - absolutely no insult is intended, just trying to help.
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
    Club Saito Member #7
    Original AMA #31261

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    OS 90 FS Manual

    Thank You!! This was a great help. This was why I wanted the manual. Now all I need is the exploded view of the FS-90 along with a parts list.
    Thanks again!

  10. #10

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    OS 90 FS Manual

    Hi all ,

    Does anyone know how to do the timing of the cam shaft in an OS 91 Surpass engine?

    BR/Costas
    Costas

  11. #11

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    RE: OS 90 FS Manual

    old os 90 fs non surpass engine. Realignment of the idle adjust screw.

  12. #12

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    RE: OS 90 FS Manual

    Hi i should have asked this question better, can anyone tell me how to relign the idle adjust screw on the old 90 fs non surpass engine. maybe someone could e-mail that page to me Thankyou.

  13. #13
    Broken Wings's Avatar
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    RE: OS 90 FS Manual

    See if this works...
    Attached Files Attached Files
    Club Saito member #715
    Club Jett member #12


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