BuggyDepot.com Tech Center 2.0   Categories: All Articles [31] Maintenance & Troubleshooting [3] BDX Install Guides [9] GY6 Performance Advice [3] Service Manuals [0] How It Works! Writeups [5] General GY6 Information [5] Weaknesses & Fixes [1] Modification Ideas [0] BuggyDepot News   We're Moving! Shipping Times Not Affected, But Phone Is Down Tuesday, June 1, 2010 BuggyDepot.com December 2009 Newsletter Wednesday, December 9, 2009 All Crossfire 150R Parts In Stock! Friday, October 9, 2009 Yerfer .net Content Available On BD! Tuesday, March 24, 2009 Slow Loading Times Today 3/23/09 Monday, March 23, 2009 Please note...   Content is copyright © 2005 - 2010 Buggydepot.com HOW IT WORKS! DECYPHERING GY6 ENGINE CODES [4,226 views]   This simple explanation reveals how to crack the code and tell what engine you have. How It Works! Decyphering GY6 Engine Codes [4,226 views - 12 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 4,226 times 12 comments about this article: Poster #1 [03/01/10] Rating: No rating. hell yes. Poster #2 [03/11/10] Rating: No rating. Hi, My code is 157FM. Digit #4 is an "M". What type of engine do I have? Thx Poster #3 [03/15/10] Rating: No rating. Hello my eng code is 150GA1 what type eng.is this Poster #4 [Travis @ BD-ORB] [03/29/10] Rating: No rating. Poster 2&3: I did some research to see what I could find on your specific engine codes and couldn't find anything to help any further, sorry. To Poster 1: Yes indeed! Poster #5 [04/08/10] Rating: No rating. Hi, My engine code is 157QMG. What type of engine do I have? Thank you for your help. Poster #6 [04/08/10] Rating: No rating. Sorry, I mis-typed my code.......it's 157QMJ. What type of engine is this? Thank you for your help. Poster #7 [04/14/10] Rating: No rating. well i have one for you code 157FM what is that Poster #8 [Travis @ BD-ORB] [04/14/10] Rating: No rating. @ Poster #6: "157QMJ" is the 150cc GY6. All of the engine/performance parts we carry should be compatible. Give us a call if you have any questions about compatibility of parts with your engine. @ Poster #7: I can't find any information on the "FM" part of your code. Can you provide any more information about your vehicle type/make/model? I might be able to help with more information. Poster #9 [04/15/10] Rating: No rating. i have a 2004 kasea 150cc quad and it has the 157FM on it as well, type of engine is it?! driving me nuts looking... Poster #10 [05/20/10] Rating: 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 #11 [06/23/10] Rating: No rating. will these numbers tell us if its a short case or long case because thats really what you need to know to get a replacement engine. i have a QMJ157 0605120863 Poster #12 [07/09/10] Rating: No rating. The 157FM engine is made by Linhai and was used in KPX, Hammerhead Twister and Carter Talon buggies. Write a comment: Was this article helpful? 5/5 - Extremely Helpful! 4/5 - It's good! 3/5 - Needs more detail... 2/5 - Should be revised... 1/5 - Re-do this one... Are you a human? Type "yes": You can rate this article without commenting... Just select your rating and leave the comments form blank!