New Rider
Currently Offline
Posts: 32 
Likes: 3
Joined: Oct 3, 2013 15:57:39 GMT -5
|
Post by creaseuk on Apr 7, 2015 23:11:30 GMT -5
I just picked up a Sunl 150cc for a reasonable price. The previous owner said it had a 'carb problem' which of course means at least a holed piston. An engine strip down revealed holed piston, bent rod, destroyed cylinder skirt and.... Bent con rod. So I junked the motor and decided to buy a replacement long case engine. Everything went well until I offered the 12" inch rear disc brake wheel to the generic motor.... No way.. it appears there is a new variation to *GY6..
Long Case/Short Case
Long output Shaft/Short Output Shaft
Big Brake Hub/Small Brake Hub.
I now have to tear down the old motor to rebuild it around the long crankcase..
If you guys have a rear disc scooter, beware of you need a replacement motor..
|
|
|
|
Post by lain on Apr 8, 2015 1:06:46 GMT -5
Looks like it's possible to put a disc on the rear where the drum brake goes.
|
|
New Rider
Currently Offline
Posts: 32
Likes: 3
Joined: Oct 3, 2013 15:57:39 GMT -5
|
Post by creaseuk on Apr 8, 2015 10:32:18 GMT -5
That doesn't look like GY6.. Great Video Though.. I do have a 250cc 12" wheel. I'm hoping the hub is bigger than the Sunl..  |
|
|
|
Post by jerseyboy on Apr 8, 2015 11:16:10 GMT -5
Well thanks for the info man,
A drum rear wheel should fit that swing arm I would think...then all you will need is a wheel instead of rebuilding the old block.
|
|
|
|
Post by lain on Apr 8, 2015 14:35:36 GMT -5
Well thanks for the info man, A drum rear wheel should fit that swing arm I would think...then all you will need is a wheel instead of rebuilding the old block. Yeah, I just looked at my friend's GY6 today. The only difference I see is the back wheel has a disc mounted on it and it has a shock attached to an extra piece of metal that goes between the wheel and the muffler. The caliper seems to be mounted ont he piece of metal too, not sure what it's called, haha. Other than that it looks the same, even has the spot where the drum brake would go just doesn't have a drum brake in it. |
|
|
|
Post by jerseyboy on Apr 8, 2015 15:13:37 GMT -5
Thats cool Lain,,
I thought so,,thanks man!
|
|
|
|
Post by lain on Apr 8, 2015 15:38:30 GMT -5
creaseuk I am thinking, if you started with a disc brake, do you have wheel with the disc on it and the caliper was on the old case? Hmm... Maybe you bought a scoot that was converted instead of built with it at the factory? If it isn't case mounted then you wouldn't have a problem though... Hmm...
|
|
New Rider
Currently Offline
Posts: 32
Likes: 3
Joined: Oct 3, 2013 15:57:39 GMT -5
|
Post by creaseuk on Apr 10, 2015 22:21:19 GMT -5
Yes - lain you are correct when referring to the 13" models. I have done a disc brake conversion for a 13" wheel model. It was a pain the proverbial, requiring total strip down of the front end, with new handlebars. My Sunl has 12" wheels with wide rims to take 12-4.00 tires. This wheel has a much smaller hub than the 13" drum braked rims. As soon as I get chance I'll send a picture to illustrate. In the meantime, this is the large drum brake backing plate with 13" wheels you describe. Incidentally, the 250cc disc brake 12 inch wheel has the larger hub but.......... has larger splines than the 150cc.. I did manage to use the 110/  -12 tire in place of the original 12-4.00 tire. So, I'm left with no option but to build a new engine around the crankcase, which is really frustrating because there is no indication on the engine number that this is any different from any other long case engine. Although, the engine is covered (both inside and out) with numbers written in sharpie.     |
|
|
|
Post by jerseyboy on Apr 11, 2015 9:02:12 GMT -5
Standard long case 157QMJ.
Thats what it looks like to me...
|
|
New Rider
Currently Offline
Posts: 32
Likes: 3
Joined: Oct 3, 2013 15:57:39 GMT -5
|
Post by creaseuk on Apr 15, 2015 22:08:52 GMT -5
|
|
New Rider
Currently Offline
Posts: 32
Likes: 3
Joined: Oct 3, 2013 15:57:39 GMT -5
|
Post by creaseuk on Apr 15, 2015 22:13:32 GMT -5
|
|
-12 tire in place of the original 12-4.00 tire. 
