o.s 40 la
 

yes can any of you guys help? my question is i purchased a used o.s. 40 la engine its used the person said he only ran, 2 tank fuls in it.i took of the muffler to see what the condition of the piston ? it looks fine but i noticed what looks to be mold or residue in the engine its like a redish color before i run the engine is their anything i should do ?i put after run oil in the cylinder and flipped it over it seems to rotate fine no binding. can i flush out the engine with glow fuel .[:-]

RE: o.s 40 la
 

I would remove the back plate and flush it ot and then run it. Being a bushed motor there are no ball bearings to worry about. The red stuff may be after run or auto oil the previous owner used. They are great running sport motors.

Cheers

RE: o.s 40 la
 

kristj179,

I believe fuel thru the engine will help eliminate any debris.
Just remove the plug and turn the engine in all directions with some fuel inside.
Change the fuel couple of times.
Lubricate abundantly after you finish that flushing.

More important is to pull apart the carburetor and clean it throughly, especially the seats of the needles.
You can use carburetor cleaner or plain fuel; just soak it for several hours.
Do not use any metal for cleaning, just wood sticks.

Next check how flexible the o-rings of the needle and base of the carburetor are.
Just order new and replace them if they are hard.

The glow plug may be good, but a new one could be better for first start ups.

http://manuals.hobbico.com/osm/40-46-65la-manual.pdf

http://www.gpdealera.com/cgi-bin/wga...pgm?I=OSMG0047

Regards!

RE: o.s 40 la
 

Just flush it like ghost says and start it up to see how it runs. It will tell you if it needs any new parts or work. LAs are great little engines and it's hard to do anything to hurt one. When/if you do they are cheap enough to replace. I have one old .40 that has been used so much it is blowing gray mater out the muffler, it just keps running and is good enough for a small trainer.

RE: o.s 40 la
 

Being the previous owner said it had 2 tanks ran through it, I wouldn'ttake it apart unless the owner said he poured sand in it. Usually the red color is from fuel or after run oil and letting it sit on the shelf for months, or years.

Goodluck, you bought a great engine brand.

RE: o.s 40 la
 

Fuel it and start it. The red is most likely after run oil. Good Luck, Dave

RE: o.s 40 la
 

Or it's congealed castor oil. It can get thick and pasty. It will thin out with heat. I have used my monocoat heat gun to thin it out and then flush it out with fuel.

RE: o.s 40 la
 

It's red.;)

RE: o.s 40 la
 

Run it, if it turns over, you're fine. Only open and wash out an engine that crashed or has dirt in it.

RE: o.s 40 la
 

i would just put fuel through it and start it if it turns freely it should clear it self out.

RE: o.s 40 la
 

I've bought a few used engines that had the same thing. Thunger Tiger Pro .40 had brown goo, K&B 40 had red. Red was probably from Klot's castor oil being added to the fuel, brown was probably just older goo. Run some new fuel thru it and it will be fine:D

RE: o.s 40 la
 

Another thing, you can take the cone out of the inside back of the muffler for more power.