Oil Change for a GY6 Moped


My deceased friend bequeathed her old Roketa moped to her roommate, who has never operated a motor bike. Since it was bought on Craigslist and did not come with a manual I’m making a short maintenance guide for the roommate. I’m going to print these in a paper booklet for her, but it seems like information that might be useful for people online as well. Here is the first installment.

Note: Clicking any photo will open it full-sized.

How to Change the Oil in a GY6 Moped

Changing the oil in your bike is the most frequent maintenance you’ll need to perform, which is why I’m putting it first. The oil on a 150cc GY6 moped should be changed every 300 miles.  This is how to do it.

The bike has two stands, a left-side-kickstand, and the double-side-kickstand. Put the bike on the double-side-kickstand which will keep the bike level and then follow these pictures.

You should run the engine for ~10 minutes before you start. This will heat up the oil and help it drain faster.

[1/16] – You should run the engine for ~10 minutes before you start. This will heat up the oil and help it drain faster.

The bike is Chinese, so all the bolts will be in metric!

[2/16] – The bike is Chinese, so all the bolts will be in metric!

Memorize this! Your bike uses SAE 10W-40.

[3/16] – Memorize this!
Your bike uses SAE 10W-40.

Oil Drain. This is the only 17mm bolt on the bike.

[4/16] – Oil Drain.
This is the only 17mm bolt on the bike.

A 500ml / 2cup food container is the perfect size for an oil drain-pan and is re-useable.

[5/16] – A 500ml / 2cup food container is the perfect size for an oil drain-pan and is re-useable.

Be careful! The draining oil will be HOT!

[6/16] – Be careful! The draining oil will be HOT!

The oil drain bolt is 4 pieces: the bolt, a rubber O-ring, the spring, and the mesh filter. If they fall in just fish them out with a screwdriver. (remember, it's hot. don't use your fingers!)

[7/16] – The oil drain bolt is 4 pieces: the bolt, a rubber O-ring, the spring, and the mesh filter. If they fall in just fish them out with a screwdriver.
(remember, it’s hot. don’t use your fingers!)

Remove any debris from the filter.

[8/16] – Remove any debris from the filter.

GY6 is the engine of your bike. When you need to buy parts make sure to include "150cc GY6" in the search terms and you'll find parts that fit.

[9/16] – GY6 is the engine of your bike. When you need to buy parts make sure to include “150cc GY6″ in the search terms and you’ll find parts that fit.

This is how it should look when the drain-bolt is reassembled correctly.

[10/16] – This is how it should look when the drain-bolt is reassembled correctly.

After the oil has drained put the bolt back on. Don't over tighten it, you can strip the threads!

[11/16] – After the oil has drained put the bolt back on. Don’t over tighten it, you can strip the threads!

Remove the oil dipstick and clean it with paper towels. It only takes a grain of sand or pebble from your driveway to damage the engine.

[12/16] – Remove the oil dipstick and clean it with paper towels. It only takes a grain of sand or pebble from your driveway to damage the engine.

This bike will use just under half a quart of oil per change... which should be every 300 miles.

[13/16] – This bike will use just under half a quart of oil per change… which should be every 300 miles.

You will over fill it the first few times. Don't panic. Put the dipstick back in and screw it all the way shut. Pull it back out and check. Too much oil pressure will damage the engine. If it's over filled you have to drain some.

[14/16] – You will over fill it the first few times. Don’t panic.
Put the dipstick back in and screw it all the way shut. Pull it back out and check.
Too much oil pressure will damage the engine. If it’s over filled you have to drain some.

You only want to loosen the plug and drain a little. If you pull the plug completely you'll lose too much. This can be messy!

[15 / 16] – You only want to loosen the plug and drain a little. If you pull the plug completely you’ll lose too much.
This can be messy!

Clean oil can be difficult to read. Re-clean the dipstick between each read. When done let the engine run a minute or two before riding.

[16/16] – Clean oil can be difficult to read. Re-clean the dipstick between each read.
When done let the engine run a minute or two before riding.

Note: Now you’ll have a container of used motor oil. Any quick lube / 10-minute oil change will recycle it for you. 

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