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Post by prodigit on Sept 17, 2013 1:19:34 GMT -5
The sprocket is mounted to an adapter that is connected to the rear wheel.
take out the rear axis, wheel, and the adapter should come out with sprocket and all.
It's basically the metal part where you mount the rear sprocket onto.
Where the adapter slides over the axis are ball bearings, they broke after 3k km with me.
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Post by cat0020 on Sept 17, 2013 8:33:23 GMT -5
Rear sprocket carrier (no adopter) have rubber spacers and rear wheel bearings are sealed bearings... not ball bearings.
Rear axle (no axis) is solid and grease when I first took it apart when I got the scooter.
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Post by prodigit on Sept 17, 2013 13:18:23 GMT -5
Well, aside from the technical name differences (I don't know the exact terminology, english is not my main language), you're confirming the same thing as I was just saying. Those sealed bearings are ball bearings. And mine broke. I guess they got too hot or something from racing too long at high speeds.
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Post by scootnwinn on Sept 17, 2013 13:30:19 GMT -5
Sealed bearings are always greased. If they fail as early as yours did it's because they are cheap, defective, or abused or all three. The grease will wash out fairly quickly if they somehow open. I can't imagine your "high speed" had much to do with it. Does the bike even have 4000 miles on it yet?? I have replaced sealed bearings just for the sake of it that were 30 years old with over 100,000 miles that were still good.
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Post by cat0020 on Sept 17, 2013 14:59:54 GMT -5
After working for bike shops for over decade, I've personally seen sealed bearing fail on numerous occasions, usually after the bearing have been submerged under water or long term abuse/ignore maintenance.
Under normal usage and conditions, sealed bearings, even the cheap Chinese made ones, are pretty durable.
Non-sealed bearings are not the same.. not nearly as durable, even with regular maintenance.
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Post by prodigit on Sept 17, 2013 21:43:04 GMT -5
I could have tightened the rear wheel too much, causing sideway forces on the bearing, causing the balls to eat through the sealing rings and in the end roll out of the bearing.
Not that I tightened it too tight, I just tightened them a bit more than usual, because it felt like it was getting loose.
If they are greased, mines may have been greased with the wrong grease. The few ones that still where in there didn't have grease on them, where shiny metallic balls.
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Post by cat0020 on Mar 21, 2014 19:51:00 GMT -5
WED, Mar 19 2014, 40 degree F, overcast, drizzle weather, I took a 100+ mi. trip from Valley Forge, PA to Hoboken, NJ on my Chinese SuperCub clone. Mostly country backroads, last 30 miles or so was just pinning the throttle at 50 mph. due to highway traffic flow..    Other than my luggage getting blown over by cross wind and burned a hole against the exhaust, the Chinese scoot performed flawlessly, even ran through a handful of potholes at 40 mph that bottomed the suspension. :lol3 105 mi. journey, filled up twice along the way, .42 & .45 gal. each. |
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Post by birdmove on Jul 3, 2014 2:20:56 GMT -5
So, you are happy with your BMS Bi-Metro? I was looking at them here: www.powersportsmax.com/product_info.php/products_id/16138 I Noticed, in the photos, some of the engines say Yinxiang on them. Others say BMS. Also, you were saying your headset loosened up. Were you talking of where the front forks attach to the frame at the steering head? There is a thread on advrider.com, where a guy bought one of these and it had handling problems at speed. Turns out, on his, the Chinese production line messed up. The front wheel was out of alignment, and he found bad welds on a tube where the forks mount, and, since things wouldn't fit, he said someone had taken a large hammer and caved in the fork housing to get it together. His was the Fly Scout, so maybe it wasn't made by BMS?? Anyway, here is the thread with photos: www.advrider.com/forums/showthread.php?t=662223&highlight=Scout |
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