Scooter Doc
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Post by Gti on Jan 1, 2012 19:28:15 GMT -6
I saw one complete GY6 engine on Scrap Dog but does any one else know where to find and complete engine? I want a 200cc without having to mess with my 150cc.
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Post by Bashan on Jan 2, 2012 7:24:49 GMT -6
There used to be quite a few of those around but after Googling I only saw one on Scrappy. I did run into a 250cc GY6 on MBE which I have never seen before. The problems with the 200cc GY6 encompass two main areas. First, the original GY6 was designed as a 50cc and pushing it to 200cc is really reaching the farthest limits of this design. Our buddy Steven at MonsterGY6 does custom built motors up to I believe 180cc but he beefs them up from top to bottom. The 200cc that are simply bored and stroked with the basic stock innards are prone to failure. Just PM Runningslow and see what he thinks. He bought that very engine from Scrappy and not only did it literally come over from a slow boat from China but was one heap of trouble. The second part of the problem with these engines is that they have the engine number 161QMK. This is not just an innocuous number stamped on the side of the engine, it means it has a 61mm engine bore and a different head. Good luck finding replacement parts for this puppy, again, just ask Running slow. IMO, your asking for a lot of trouble for little or no gain and would be better served juicing up a 150cc or talking to Steven at MonsterGY6 about getting a 180cc that would probably run circles around the 161QMK. I don't know anything about this 250cc GY6 from MBE:
250cc 4 stroke Water Cooled GY6 Motor (scroll down page on link)
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Post by Alleyoop on Jan 2, 2012 20:36:21 GMT -6
On mine I only went to a 62mm bore because going to a 63mm would leave the wall next to the Timeing Chain even thinner. I think going higher than that the wall will not last very long unless it it built up.
my .02
Alleyoop
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Post by Alleyoop on Jan 2, 2012 23:13:29 GMT -6
Do you have a picture of a GY6-B case to see how much material is by the Chain Side to Compare against you Regular GY6 case.
Alleyoop
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Post by Alleyoop on Jan 3, 2012 1:05:10 GMT -6
I would like to know WHERE he got a GY6-B case in the first place, I have searched all over the place and nothing. I do understand they had a lot more meat to them which would be great then you could really get a nice strong engine built.
Alleyoop
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Post by Bashan on Jan 3, 2012 5:25:29 GMT -6
Dean, what's your engine case number? Rich
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Post by runningslow on Jan 3, 2012 10:25:08 GMT -6
There used to be quite a few of those around but after Googling I only saw one on Scrappy. I did run into a 250cc GY6 on MBE which I have never seen before. The problems with the 200cc GY6 encompass two main areas. First, the original GY6 was designed as a 50cc and pushing it to 200cc is really reaching the farthest limits of this design. Our buddy Steven at MonsterGY6 does custom built motors up to I believe 180cc but he beefs them up from top to bottom. The 200cc that are simply bored and stroked with the basic stock innards are prone to failure. Just PM Runningslow and see what he thinks. He bought that very engine from Scrappy and not only did it literally come over from a slow boat from China but was one heap of trouble. The second part of the problem with these engines is that they have the engine number 161QMK. This is not just an innocuous number stamped on the side of the engine, it means it has a 61mm engine bore and a different head. Good luck finding replacement parts for this puppy, again, just ask Running slow. IMO, your asking for a lot of trouble for little or no gain and would be better served juicing up a 150cc or talking to Steven at MonsterGY6 about getting a 180cc that would probably run circles around the 161QMK. Rich, actually, I believe them to be a quality motor. I've put several thousand miles on mine with no trouble. That being said, I will say to avoid the motor, for no other reason than finding replacement parts.I think many of my problems with the replacement engine from Scrappy were sadly, self inflicted. Actually, the engine was running great when I had to pull the head to replace it, because of the broken exhaust stud. I believe I was running extremely lean, which caused it to run hot, which caused the exhaust stud to crack out. The issues I've had with the oil cooler are are definitely self inflicted, which I still have not resolved, but that's just a cash flow issue. FYI, the engine I bought from Scrappy was stamped 161QML (~189cc). The factory motor on the Matrix was a 161QMK (~168cc). |
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Post by runningslow on Jan 3, 2012 10:32:34 GMT -6
very true..but if you use a gy6-b case....  BmWxPR: Are the QMK or QML considered GY6-B engines? I know these are a more robust case, because at least both of mine were cast ready for a 61mm cylinder. The critical issue I've run into with these engines is the head bolt spacing, so I wouldn't be able to use any of the BBKs that I've seen. (Not that I'm looking to go any bigger right now) |
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Scooter Doc
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Post by sprocket on Jan 3, 2012 17:13:43 GMT -6
The XX157QMJ is considered the GY6-B as far as I know. The cases are very different and the transmission has an extra set of gears for the 16" wheels... I have no idea what the larger engines are called are called... Attachments:
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..BAD TO THE BONE..
