Post by lostforawhile on Jan 29, 2018 18:58:12 GMT -6
I'm going to link this to my thread on 49cc scoot, these used to be quality starters, but it looks like they went full crap. This is the third one in 3000 miles. This is the same brand many parts places sell. basically the end of the armature, which is plain steel, is riding in a plain steel bushing, instead of a bronze or oilite bearing, and they don't even have any grease in the bushing. The bushing or shaft wears,then the armature drags on the magnets, because it's out of alignment. If they had just installed a dam proper bushing, they would be great starters. 49ccscoot.proboards.com/thread/20724/hawaia-starter-recommendation
Having the motor rotor shaft end wear out in 1,000 miles ( how many starts?) is not normal.Even with no grease they should last for years with "normal" start times. Lubing the end caps will help but only to a point. If you still have all the receipts,I would contact the seller and see if there is a warranty or if they are aware of this short life problem? You have rights as a consumer you can exercise.
I would also check out your starting voltage. Make sure the replacement starter motor is the correct voltage. a 6 volt starter in a 12 volt system will have a very short life. Also make sure the starter "Bendex" is not binding on the flywheel causing undo sideway force on the shaft.
Post by lostforawhile on Feb 5, 2018 21:29:32 GMT -6
I've never even seen a 6 volt starter for a scooter, this is the standard starter for a 139qmb, the issue is, they put a steel machined end, in a plain steel bushing, with no grease, it doesn't take long for it to wear, as most cheap Chinese steel, isn't properly hardened, I'm sure this contributes, from measuring the inside diameter of the bushing, with a bore gauge, and measuring the outside diameter of the shaft end, there is a clearance of nearly .020 ,plenty to cause the armature to rub on the magnets