Author Topic: Do SYM scooters use a GY6 engine??  (Read 175 times)

Cibby600

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Do SYM scooters use a GY6 engine??
« on: June 26, 2021, 05:56:53 PM »
Hi all,
I have a a few VS 125's and 150's that I need parts for. Parts are expensive or hard to get in Sydney. I can't find a definitive answer wether or not these scooter use a GY6 type engine??
I was going to buy some GY6 parts off Ebay, but not sure if they will fit.
Any help / advice will be greatly appreciated.
Cheers.

Syd

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Re: Do SYM scooters use a GY6 engine??
« Reply #1 on: June 26, 2021, 09:18:24 PM »
I don't think so.

Thoppa

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Re: Do SYM scooters use a GY6 engine??
« Reply #2 on: June 26, 2021, 11:03:36 PM »
Hi Cibby,

I have seen a ton of GY6 parts on Taoabo but it seemed to me that they weren't all for the same engine, with some for a 125 and some for a 150, a 200 and a 250. Here's an Alibaba version showing different engines with GY6 tags.
https://www.alibaba.com/countrysearch/CN/engine-gy6.html
So I googled it and found GY6 engines are not all the same it seems - GY6 is a common design with variations.
https://www.infobloom.com/what-is-a-gy6-engine.htm
So I think you've got some major work to find out if a part will fit or not. I found this page on engine unit codes - maybe it's a start?
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.

http://www.buggydepot.com/buggy-tech-center/read/150cc/0/24/how-it-works-decyphering-gy6-engine-codes.html
« Last Edit: June 26, 2021, 11:08:48 PM by Thoppa »
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Cibby600

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Re: Do SYM scooters use a GY6 engine??
« Reply #3 on: June 27, 2021, 08:41:28 PM »
Thanks all. Yeah I have a VWV Engine number. I think it may be SYM's own take on the GY6 design. Hard to say. lol

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