Picked up a Coolster 3150dx2 for cheap because the final drive shaft was loose and leaking oil.
http://www.flickr.com/photos/1891901.../shares/FU6x74
http://www.flickr.com/photos/1891901.../shares/11k7P5
Something is obviously missing here. Either a bearing or the very least an oil seal. By my measurements there’s 5mm of slop between the the shaft and the case. The Coolster manual is almost as useless as the parts diagrams. Not to mention the sprocket Coolster says is for this looks nothing like it. The gy6 diagram doesn’t show anything in that area. If I knew what it was supposed to look like I could probably figure out a work around