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Changing the oil in your scooter
What I'm going to describe is how to change the engine and
transmission oil in a 150cc chinese scooter with a 4 stroke engine.
The procedure should be pretty similar on 50cc and 250cc models with
4 stroke engines. 2 stroke engines mix gas and oil and so have no
engine oil to be changed.
I'd recommend changing the engine oil at least every 1000 miles,
and the transmission oil at least every 2000 miles. Regular oil
changes are the easiest and cheapest way to maximize the life of
your engine. Scooters take so little oil that it should cost less
than $5 to do and once you know how to do it it should take you more
than 10-15 minutes. It's time and money well spent.
The first thing to do is to warm up the engine. Run it for a few
minutes so that the oil is warm. That way it will flow easier. If
you run it until the engine is hot, or you change the oil after you
come back from a trip, that's OK, but you run the risk of burning
yourself on the exhaust or with the hot oil. Be careful.
Find some level ground and put the scooter on its center stand.
If the ground isn't level you won't get an accurate reading of the
oil level when you put the new oil in. To change the engine oil
you'll need a wrench to remove the oil drain plus, a flat dish
container with a capacity of about 1/2 gallon and a funnel. First
remove the "dipstick" which you use to check your oil. I'd also
recommend you wear rubber gloves, or at least on on the hand you use
to remove the oil drain plus. On most scooters there is a spring
which will push the plug out when you have fully unscrewed it and
oil will pour out of the drain hole, all over your hand. It's just
messy if the oil is cool or warm, but if the oil is really hot it
will burn your hand. So wear a glove to be safe.
Put the container for the used oil below the drain plus, loosen
it with a wrench and then slowly unscrew it by hand. As it comes
lose, the spring will push it down, so be prepared for that. You may
drop the spring and a small wire mesh filter into the draining oil,
but that's OK, you can fish them out later! Give the oil a minute or
two to drain out. Make sure the filter is clean and then put the
filter, spring and drain plug back. The spring sits on the plug and
the filter sits on top of the spring with the mesh basket inside the
spring.
You'll
have to compress the spring to start the drain plus screwing into
the engine, but once it does start, tighten it up by hand to make
sure it's not cross-threaded. If it screws in easily, it's OK. If it
doesn't want to tighten, you've probably cross threaded it, so try
again. Finally tighten it up with a wrench. It should be tight, but
don't overtighten it. The seal is made with a rubber "O" ring. You
just need to tighten it enough so that it doesn't vibrate lose
(which would be a disaster since all your oil would drain and the
engine would seize!). The recommended torque on the drain plug is
1.4 kg.m (about 10 ft.lb)
Now you can add the new oil. It goes into the same hole as the
"dipstick" fits in. You'll almost certainly need a small funnel to
get oil into the filler hole without spilling it. Check your user
manual for the recommended oil type, but on most chinese 4 stroke
scooters, regular 10-30W or 15-40W engine oil is used. I use Castrol
GTX 10-30W. You can get a 5 quart bottle for around $12 (try
WalMart) which is good for at least 5 oil changes on a 150cc
scooter. You can also use a synthetic oil blend if you wish, though
pure synthetic oil isn't usually recommended. On a 150cc scooter
you'll need about 0.8-0.9 liters which is just under 1qt. As you add
the oil, check the level with the dipstick from time to time and
fill to the recommended level. When you have the right level, screw
the dipstick back in and you're done!
Changing
the transmission oil is also very simple. Most scooters recommend
changing the oil at least every 2000 miles. At the rear of the CVT
on the left side of the bike there are drain and fill plugs for the
transmission. Place the oil drain container under the drain plug.
Now remove the filler plus first, then the drain plug and about 100
to 200cc of oil will drain out. There should be a sealing washer
between the drain plus and the transmission casing. On my scooter
it's a thin aluminum washer. Make sure it's there and then screw the
drain plug back into the transmission case. To refill the
transmission, you squirt oil into the fill hole until it runs back
out. That's your level check! Use the recommended oil, which in most
cases is 80W-90 gear oil (though a few bikes may recommend using
engine oil). To get it into the small hole you can use a small
funnel and a short length of small diameter rubber hose, a syringe
or even something like a turkey baster! All you need is something to
squirt 100-200cc of oil into the hole. You may be able to buy the
oil in a plastic bottle with a long plastic tip, which you can use
to directly squirt oil to the transmission fill hole. When it starts
to run back out, it's full and you can replace the fill plug (note
that it too should have a thin aluminum sealing washer).
Now run the engine for a minute or two, then check the oil level
and add more if necessary. Check for any leakage around the drain
plugs. If all looks OK, you're done for another 1000 miles. |