Do I need to drain the engine case on my 2002 Fat Boy when changing the oil?

SOURCE: gear box and crankcase oil amounts

You have THREE oil 'compartments' on your particular year&model bike.

(1) The ENGINE OIL
---( which holds 3 to 3.5 quarts or liters of oil).
---On the right side of the bike, and at the rear of the ENGINE OIL TANK, you should notice a Hose that is connected to the oil tank. Follow that Hose downward.
The other end of that hose will either :

----A: Be connected to the bottom of the frame,
OR
----B: Have a Metal Plug in the end of the hose. That 'plug' will be held in the hose via a hose clamp, and also will be secured to the frame via a 'clip' that is actually part of the frame).

-- IF(A): the Hose leads from the tank and is attached to the frame, you will notice a hex-head plug (that also has a hex-cutout in it's center for insertion of a hex or allen key) underneath the part of the frame that the hose is attached to. Remove/Unscrew that Hexplug from the frame to drain the engine oil.

--IF(B): the hose that leads from the Oil Tank has a "HosePlug" that is inserted into the end of the hose, remove that plug to drain the engine oil.

*Removal of the Enging Oil DIPSTICK, located at the mouth/fill area at the top of the Tank will aid in a faster flow of oil from the tank. When done draining, re-install the drain plug.

-When changing the engine oil, also remove and install a new Oil Filter.

*Put in no more than 3 quarts/liters of oil into the Engine Oil Tank.
*Ride your bike for min. of 10 minuets, then park and shut down the engine, wait for about 2 minuets, and check the level via the Dipstick. Proper oil level will be at or just below the 'FULL' mark of the dipstick.

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(2) The TRANSMISSION OIL:

On the right side of the motorcycle, the
TRANSMISSION OIL FILLER PLUG/DIPSTICK is located on the foward facing side of the Transmission End Cover. The Trans End Cover is the cover that the Clutch Cable goes into. The Trans Fill/Dipstick has a Hex/Allen cutout in it for insertion of a hex/allen key to remove it.

The Trans DRAIN PLUG is either located either:
A: -Located on the Transmission Case, JUST BELOW the Trans End Cover. If here, the "Drain Plug" will be a TORX fastener. Remove that Torx fastener to drain the Trans Oil.
OR
B: -Located UNDERNEATH the Trans Case, in between the two Shock Absorbers. If here, the 'Drain Plug" will be a HexPlug that is the same type drain plug as described earlier for the engine drain.

TRANSMISSION OIL QUANTITY is as follows:
** 600 ml. for a 5-speed transmission.
OR
** One Full Quart/Liter for a 6-speed Transmission.

******Use the Trans Dipstick to verify that the level is correct. Between the FULL and ADD mark, or at the FULL mark.

ALSO NOTE: Drain, and Check your Oil when the bike is level. Have a friend assist you if needed. You don't want the bike falling, and/or landing on you.

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(3) The PRIMARY OIL

Located on the LEFT SIDE of motorcycle, the PRIMARY HOUSING connects the Engine Crankshaft TO the Transmission Output Shaft via a Primary Chain, which is lubricated by an oil bath.

(Make sure the Engine Run/Stop Switch is in the STOP or OFF position).

Remove the DERBY COVER (the Large round cover, with 5 Torx Fasteners. With the bike level, you should note that the oil level come to approx. just past the bottom of the Clutch Basket.

The Primary DRAIN PLUG is located: either at the

(A) Left Face of the Outer Primary Cover, below the Derby Cover.
If so, it will be a TORX or HEX/ALLEN fastener. It is NOT the same as the Hex/Allen fasteners that surround the Outer Primary Cover securing it to the Inner Primary Cover.

OR

(B) Located UNDERNEATH and ON the Outer Primary Cover, just below the Derby Cover area. It will either be a HEX FASTENER, or a Torx Fastener.

-Remove the Drain Plug to drain the Primary Oil.
-Reinstall the drain plug and fill (thru the Derby Cover Area) with ONE QUART/LITER of PRIMARY OIL.


****** BE SURE to clean and coat the threads of each Drain Plug with Teflon Paste thread sealant. NOT THREAD LOCKER.

****** BE SURE NOT TO OVER TIGHTEN THE DRAIN PLUGS.

If you are unclear of anything I wrote, please dont' hesitate to get in touch with me through here.
Good Luck , and THANK YOU.
-Marko

SOURCE: How do I change the oil on a 2002 fat boy?

On the fatboy, the oil drain plug should be on the right side, just under the frame, directly below the oil tank. The primary drain is on the left side under the derby cover on the bottom. The tranny drain is on the bottom towards the rear pretty much centered.
And, as our darlin' little miss piglet said, a maual is worth the investment.

SOURCE: how to change oil on 2002 fat boy

The drain plug is a hose that comes down to a sprung clamp on the frame behind the gear box on the right side of your bike. Remove from clamp then undo the screw-ring round the hose to allow the plug in the hose to be removed, take lid off oil tank and turn engine over a coupla times to clear engine oil into drainage tank. Replace plug- etc before refilling with half the oil, turn engine over coupla times then add remaining top up oil. Drainage for your primary oil is at the rear inside near the gasket joint and can be removed with a Hex spanner, taking the large outside cover off your primary with star drive sockets to allow airflow for drainage and then to pour new oil in through after replacing drainage plug in the bottom. Buy a Manual Mate, its worth it eh considering the value of your bike?

SOURCE: Cannot locate oil plug drain

THE OIL DRAIN PLUG ON A 2001 FLSTF ( FATBOY) IS JUST IN FRONT OF REAR TIRE ON RIGHT SIDE OF BIKE. ITS IN A FRAME SUPPORT RAIL, YOU CAN TELL BY LOOKING AT IT CAUSE THE PLUG CAN BE REMOVED WITH A 1/4 ALLEN WRENCH OR A SOCKET (SORRY DON'T REMEMBER SIZE) AROUND THE WHOLE DRAIN PLUG.

SOURCE: Where is the oil plug to drain the oil on a 2005

The oil drain hose comes of the lower back side of the oil tank on the right side of the bike. It runs down behind the transmission and comes out just in front of the swingarm down low on the frame. It either dead ends there with a plug in the end or it connects to a crossmember of the frame that runs underneath the transmission. If it connects to this crossmember, the drain plug is on the bottom side of the crossmember directly opposite the hose.

Good luck
Steve