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Post by dmartin95 on Oct 5, 2014 11:28:05 GMT -5
Hi all. My motor is a BN157QMJ. I've seen this motor referenced as a "GY6-B" on some sites, but others list it as a standard GY6. From what I've learned so far, "B-case" motors have a 57mm stud spacing and an "A-case" has 54mm spacing. Now, something that I've found very confusing is the valve cover. I found a lot of sites stating that the GY6 "B-Case" has a 2-Bolt valve cover. My BN157QMJ does not. It has the 4 bolt, EGR valve cover. My scooter is 150cc Bintelli Havoc, with the BN157QMJ, with 13" wheels and front/rear disk brakes. Can anyone tell me if this is a "B-Case" motor Here's a link to some info at scrappydogs, but take note, they list it as GY6-B 16" wheel (mine is 13" w/disk brake) Thanks for any help guys! |
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Post by alleyoop on Oct 5, 2014 11:58:41 GMT -5
Yes, it is considered a B-Case not your standard GY6 motor.
Alleyoop
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Post by tvnacman on Oct 5, 2014 12:14:35 GMT -5
open the cvt , look at the clutch and variator another way to tell is the intake manifold look at them and see what you have . John |
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Post by pmatulew on Oct 6, 2014 12:00:06 GMT -5
I have a BN157QMJ in a ZNEN scoot with 12" wheels. So far the only parts that don't interchange with a regular GY6 are the kick start parts because of a different style CVT cover. I changed out the top end with regular parts.
Might have to be careful with the crank though. I don't know if they changed anything there.
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Post by alleyoop on Oct 6, 2014 12:41:02 GMT -5
Must be different BN157QMJ then because on Scooterprofessor a guy blew his BN157QMJ motor and he had to get a new head and a standard gy6 did not fit. Then he broke his old rocker assembly and he ordered a standard rocker assembly and the rockers were different so I told him to swap the rockers off the old rocker assembly and put them on the new one and that worked. So there are differences not all parts are interchangeable.
Alleyoop
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Post by dmartin95 on Oct 6, 2014 18:50:56 GMT -5
Must be different BN157QMJ then because on Scooterprofessor a guy blew his BN157QMJ motor and he had to get a new head and a standard gy6 did not fit. Then he broke his old rocker assembly and he ordered a standard rocker assembly and the rockers were different so I told him to swap the rockers off the old rocker assembly and put them on the new one and that worked. So there are differences not all parts are interchangeable. Alleyoop I appreciate the response..... However im hoping you can further explain these b-case engines. Some of them have a -3, -5, etc, etc at the end of the model number... I.E. BN157QMJ-3. I Have found so much conflicting info on the web about this motor im determined to make an ultimate guide to the b-case motor. |
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Post by alleyoop on Oct 6, 2014 19:14:39 GMT -5
There are a couple of B case motors one for the 16" wheel scoots and one for the smaller wheeled scoots. But either motor is different from one another and the one that is way different is the one for the 16" wheel scoots. There are to many types of 157 motors some are strictly for atvs and are completley different than the ones for the scoots. Honestly the only way to find out the real differences is if someone had every single motor and tore them apart.
Alleyoop
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Post by dmartin95 on Oct 7, 2014 18:03:15 GMT -5
There are a couple of B case motors one for the 16" wheel scoots and one for the smaller wheeled scoots. But either motor is different from one another and the one that is way different is the one for the 16" wheel scoots. Can you elaborate on what you mean you say "the one that's way different?" My wife has a 2011 BMS and it also has a BN157QMJ, however, her scoot has a 10" wheel. I assume that's the one they call the short GY6-B case? Her BMS also has rear drum brakes. My Bintelli Havoc however is quite the odd-ball. It has a 13" rear wheel with disk brakes. In addition, I'm not sure, but I think it could accommodate a 16" wheel. Again, another assumption is that it's a long case.... However, I do know for a fact they also make GY6-B long case with rear drum brakes.... Scrappydogs 200cc GY6 is a B, long case with drum brakes. Anyhow, the whole reason I am asking this is because I'm interested in obtaining the Taidi Oil cooler However, they have 2 different ones. One for the B-case which has 57mm stud spacing and then they have the other for the A-case that has the 54 mm stud spacing...... |
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Post by alleyoop on Oct 7, 2014 19:06:06 GMT -5
Well would it not behoove you to take the valve cover off and measure the stud spacing and making absolutely sure you get the right one. I for one If I had the motor in front of me would measure and would not depend on someone knowing all the motors and their differences. I know for a fact the 16" wheel one has the wider studs and wider rockers but that is because I helped the guy on Scooter Professor about a month ago fix his blown motor and he was taking pictures and videos for me.
Alleyoop
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Post by dmartin95 on Oct 7, 2014 20:07:43 GMT -5
Well would it not behoove you to take the valve cover off and measure the stud spacing and making absolutely sure you get the right one. Part numbers, part numbers, part numbers...... Yes, I could just pop the valve cover off and measure the stud spacing but I was hoping that someone on this board may have the knowledge off the top of their head. I'm new to these "Chinese Scooters" and I've taken an interest in understanding the in and out's. I've bought the Haynes Chinese Scooter manual and downloaded 100's of scooter diagrams, manuals etc etc.... Trying to make sense of the differences with these GY6 is something I'm determined to do. It's very hard to find accurate information for a particular scooter at times and with help from people, those differences can be cataloged and published. One more thing, this thread wasn't just about "my motor". I am trying to figure out how many different GY6 "B-case" motor varieties there are and what the differences are between them. You and scrappydog have added to that list already. The "16" wheel BN157QMJ" does in fact have 57mm stud spacing. Thanks for the feedback and I will pluck the valve cover and publish my results..... |
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Post by tvnacman on Oct 8, 2014 10:27:57 GMT -5
There are a couple of B case motors one for the 16" wheel scoots and one for the smaller wheeled scoots. But either motor is different from one another and the one that is way different is the one for the 16" wheel scoots. Can you elaborate on what you mean you say "the one that's way different?" My wife has a 2011 BMS and it also has a BN157QMJ, however, her scoot has a 10" wheel. I assume that's the one they call the short GY6-B case? Her BMS also has rear drum brakes. My Bintelli Havoc however is quite the odd-ball. It has a 13" rear wheel with disk brakes. In addition, I'm not sure, but I think it could accommodate a 16" wheel. Again, another assumption is that it's a long case.... However, I do know for a fact they also make GY6-B long case with rear drum brakes.... Scrappydogs 200cc GY6 is a B, long case with drum brakes. Anyhow, the whole reason I am asking this is because I'm interested in obtaining the Taidi Oil cooler However, they have 2 different ones. One for the B-case which has 57mm stud spacing and then they have the other for the A-case that has the 54 mm stud spacing...... Have a 16" wheel scooter , it came with drum brakes . The center hub was not centered . I could not get the rear brake adjusted . Long story short , it's been converted to disk . Just a different wheel rotor and so on . John |
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Post by dmartin95 on Oct 20, 2014 23:25:58 GMT -5
Today I heard back from the distributor ( President of Bintelli Scooters - Justin Jackrel) of my scooter and they verified that my engine, an BN157QMJ is NOT a "B"-case motor. It's an "A" case with 54mm stud spacing. To summarize for anyone who reads this in the future, the BN157QMJ part number does NOT mean the engine has 57mm stud spacing. The BN at the front of the part number identifies the engine was made by BenNeng of Zhongneng, not that it's a "B"-case motor. This page on ScrappyDog has an excellent article on CHINESE ENGINE CODE DECIPHERING I.E. - BN157QMJ translates into the following: BenNeng Nhongneng 1 = 1 Cylinder 57 = 57mm Bore Q = Forced air cooling M = Use is Motorcycle J = 150cc |
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Post by scrappydogscooters on Oct 21, 2014 9:19:19 GMT -5
Yes, you are correct dmartin95. The BN157qmj has 54mm stud spacing, however, it loosely is considered a B case engine by some, but not by ScrappyDog. We call it the BN The BN157 with extra long case (16" wheel) has a (somewhat) standard A case cylinder, but has a taller head, and also has a slightly longer crankshaft. The variator and rollers are different also. This BN engine that is deviant typically has a -3 at the end of it. To confuse matter more, there is a BN157QMJ (no -3) that was used in some scooters, like the Lance Duke, that uses 12" wheels and is NOT a deviant -B. Parts for this variant are at the below link, and we are adding some more BN parts including complete engines which will arrive next week: www.scrappydogscooters.com/GY6-B_16__wheel_BN157QMJ.htmlThe engine we call a -B has 57mm stud spacing, which we sell as the gy6-200. The cylinder and head are different of course, but the crank and variator are overall the same enough to interchange. We sell stock, and even now performance parts for the larger case -B and these can be built out to 232cc's. The gy6-200 is generally built to a beefier and high quality standard and also includes oil cooling: www.scrappydogscooters.com/gy6-200_GY6-B_case.htmlNow we confuse things even more with the -B engines as there are some other deviant gy6's out there, especially with ATV based engines, like Kazuma. Let's not forget that QJ (Quingiang) has another variant engine which has a different cylinder and head, but not much different. We sell the QJ parts at the below link: www.scrappydogscooters.com/QJ157QMJ_parts.htmlHope this helps, and doesn't sound like an advertisement. I may post this in "tech talk with MO!" page on our site to help others. Rick |
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Post by dmartin95 on Oct 21, 2014 9:31:36 GMT -5
ScrappyDog, No, it does not sound like an add. I feel like I struck gold with this info! Your awesome!
As you probably know, info on these scooter motors are hard to come by. I've searched all over the web and kept coming back to Scrappydogs.com for information. You also have some of the coolest Mods for these scoots out there... The 232cc BBK is awesome.... I'm glad I have this opportunity to thank you for publishing all the info that helps others and thanks for shedding light in this thread.
I'm throwing you a Bone!
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Post by dmartin95 on Oct 21, 2014 9:37:27 GMT -5
I may post this in "tech talk with MO!" page on our site to help others. Rick Oh yea, one more thing.... I hope ya don't mind me linking to your site and using your pic.... It was just the best source I could find.... |
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..BAD TO THE BONE..
