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How It Works! Decyphering GY6 Engine Codes
[78,383 views - 67 comments - Rating 4/5 ****- ]
So you found a code on your buggy or scooter and you're wondering what it means. The code can actually tell you a lot about a specific engine.

You can find your engine code below the CVT cover, beside the oil drain plug.

We'll take a look at the most common engine code: 157QMJ.
The first thing to note is that the actual code always starts with the first number, and continues for a total of 6 digits. Anything extra is a manufacturer-specific information that won't be covered here at this time.

Lets disect the code starting with the first digit:
(Digit #1) Corrasponds to the number of cylinders. All GY6 engines are single cylinder, so this number will always be 1.

(Digit #2 and #3) This is the bore size in metric millimeters, in the case of the 157QMJ, our bore is 57mm. Note that 57.4mm bore engines fall under the "57" designation.

(Digit #4) relates to the style of engine. All GY6 engines are designated "Q".

(Digit #5 and #6) The actual size of the engine. The second letter ascends consecutively for each 10cc. MB = 50cc, MC = 60cc, MD for a 70, MH = 110cc, MI = 125cc, MJ = 150cc

That is pretty much it for the standard codes stamped on most GY6 and other Chinese engines. We will add more information about manufacturer-specific codes as we find it out.

Feel free to post your engine code or any additional information below in our comments box, we'll add any new information here!
This article has been downloaded 78,383 times
67 comments about this article:
Poster #1 [05/20/10] Rating 3/5 ***--
I got a buggy with no name or marking but the NO# on the case are JL1P57QMJ can anyone tell me about it
Poster #2 [08/11/10] Rating 5/5 *****
thanks again
Poster #3 [10/24/10] Rating 1/5 *----
my gy6 says k01494. it says on the head ky10 gy6. the side cover says smc. what the heck is it and what parts do i use. it is on a carter xtv 2150. this is the problem since carters facility burnt down in july i believe.
Poster #4 [11/03/10] Rating 3/5 ***--
what is the compression in psi's of my gye howit 150cc engin
Poster #5 [11/16/11] Rating 5/5 *****
Need to get a cert of origin or MSO for my 2003 yerf dog rover. Anyone have any ideas how to get this? Need to get a title for offroad tag. Thanks
Poster #6 [11/22/11] Rating 5/5 *****
will gy6 bore kits work on 157fm talon karts/
Poster #7 [02/13/12] Rating 5/5 *****
how about my engine 147 QME

Poster #8 [02/13/12] Rating 4/5 ****-
my engine is 147 QME
Poster #9 [06/24/12] Rating 5/5 *****
hi I have a carter talon with an engine code 152fm ...
Poster #10 [06/24/12] Rating 5/5 *****
hi I have a carter talon with an engine code 152fm ...
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