Have a Honda FG110 - today I found a large puddle of "clean" oil under it! does not appear to be engine oil .. gear case maybe?

see this instruction. God bless you

1. • 1
     Park the Honda Foreman on flat ground and leave the engine running for 5 minutes to allow the engine to warm up. Place the oil drain pan under the crank case drain plug. Turn the engine off.
     
     
   • 2
     Remove the drain plug from the under side of the crank case using the ratchet set. Allow the engine oil to drain into the oil pan. Replace the plug to the bottom of the crank case and tighten the plug using the ratchet set.
     
     
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   • 3
     Remove the small screw from the side of the crank case using the Allen wrench. Remove the cap labeled "OIL" from the top of the crank case. Insert the funnel into the hole where the oil cap was.
     
     
   • 4
     Pour Honda 4-stroke engine oil into the funnel until the oil starts to come out of the hole where the small screw was on the side of the crank case. Once the oil starts to come out of the hole, stop pouring and replace the screw. Remove the funnel and replace the oil cap to the top of the crank case.
     
     

Read more: http://www.ehow.com/how_6512146_change-oil-honda-foreman.html#ixzz2ZPlA2Cu0

clean up the engine with a good engine cleaner follow the instruction of the can use a hight preesure wather machine ,(cover with plastic bags the electrics parts alternator,ignition components ,etc....)after you clean up the engine run afew miles and you will be found the exact place of the oil leak.

SOUND LIKE FRONT CRANKSHAFT TIMING COVER SEAL OR REAR MAIN OIL SEAL LEAKING START ENGINE LET IT IDLE SEE IF YOU SEE OIL DRIPPING UNDERNEATH CAR LOOK FOR OIL LEAK AT TIMING COVER OR AT REAR OF ENGINE WHERE REAR MAIN SEAL LOCATED. CHECK ON TOP OF ENGINE INTAKE MANIFOLD AREA WHERE OIL PUMP DRIVE GEAR IS.O - RING AT THE OIL PUMP DRIVE GEAR WILL CAUSE LARGE OIL LEAK.OIL PUMP DRIVE GEAR IS LOCATED WHERE THE DISTRIBUTOR USE TO BE LOCATED.KEEP EYE ON OIL LEVEL IN CRANK CASE.KEEP PLENTY ENGINE OIL ON HAND UNTIL YOU FIX.I WOULD FIND LOCATE PROBLEM QUICK AS POSSIBLE BECAUSE OIL LEVEL GET TOO LOW ENGINE WILL SEIZE UP LACK OF OIL..

Power steering fluid? Rack leaking? try ATP AT - 205 re-seal additive. Good for engine ,PS and transmission.

Check your sump nut, oil pressure switch, oil filter .are they secure .another clue is look for oil marks around the engine bay.

They could be related - but what you need to do is first clean out the oil that has collected in the air filter housing - and replace the air filter. Then, clean the oil from the engine - Simple Green and an old tooth brush works great for this. Wash the engine and surrounding areas with soap and water.
Now, with things cleaned off, you'll be able to tell where the oil is coming from after a short test ride. It could be that the oil you saw near the head gasket was actually running from the air box. Hopefully, a new air filter will cure the problems you had with low power and poor throttle response.

In some cases where the oil is not changed properly, the oil pump screen maybe plugging or your oil filter is defective. Fram is a good filter. If there is no problem found, replace the pressure sensor.

the gear oil is the engine oil kept in the sump at th bottom of the engine

If It is a Honda FG100 like in the title the part number is 65141-V06-003
If it is a FG110 like in the description the part number will be 63411-V25-000 FENDER, RR. and 65141-V25-000 FENDER, FR.