Post by 90GTVert on Feb 14, 2010 15:58:51 GMT -5
GY6 50cc (139QMB) Oil Change
Before I start with instructions, I should note that the images here show the engine on a workbench, out of the scooter. There is no need to remove your engine, mine just happened to be out at the time.
One more note. Engine oil changes can be done with the engine warm to thin the oil for faster and more complete draining. If you do your oil change on a hot engine, be very careful around all metal components to avoid burns.
Begin by locating the drain plug and placing a catch pan under it. Standard catch pans don't always work well because there isn't much room between the center stand and the rear tire. I used an old hand cleaner container, but there are lots of cheap options. You could cut a 2 liter soda bottle in half or use an old large can for example.
Now, remove the drain plug (mine is 17mm) and let the oil drain out into the catch pan. Once the oil stops flowing, lean the scooter toward the drain plug for a moment. This should get a little more oil out. Once all the oil is out, replace the drain plug.
You could move on to refilling your engine with oil at this point, but I like to clean the "filter" first. Even if you don't do this at every oil change, it should be done during every other oil change at least. Move to the other side of the scooter and you should see a large cap with a 17mm hex head in the center of it located on the bottom of th engine, below the cooling fan.
Carefully remove this plug. The cap should come out along with an o-ring in the cap, a spring, and a screen filter.
Remove the o-ring from the cap, being sure not to damage it, and then clean everything with brake parts cleaner.
Re-assemble the cap, o-ring, spring, and filter and screw them back into the engine securely.
Now locate the engine oil dipstick, just behind the cooling fan, and remove it. Wipe any old oil or residue off of it and leave it out for now.
Place a funnel in the filler neck and add 750mL of your favorite oil. I like Rotella T because it's a cheap heavy duty oil. There are other good choices out there though.
Now replace the dipstick and start the scooter to let it warm up for a minute.
Turn the scooter off after it has ran for a minute or two and check for oil leaks. Remove the dipstick, wipe it clean, then re-install it. Now remove the dipstick again and check the oil level. Oil should reach the dot on the dispstick. If not, add or drain oil accordingly.
