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Post by prodigit on Aug 31, 2013 19:35:12 GMT -5
The rear swingarm should support downto 30T sprockets. At least it does on mine.
Helps to lithium grease the chain, and make sure the rear wheel is tightened (the chain has little play).
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Post by scootnwinn on Sept 1, 2013 17:56:52 GMT -5
Be careful guys when getting advice on the internet. There is an actual specification for your chain's tightness. Too little freeplay like the poster above suggests is a bad idea that could lead to excessive wear and has in the past even led to catastrophic engine failure and rider dismemberment and death. The geometry of the swing arm requires the chain not be tightened too much... Ride safe guys make sure the information you choose to rely on is supported by multiple sources or your owner's manual. Just because someone acts like they know things doesn't mean they do...
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Post by prodigit on Sept 1, 2013 18:27:34 GMT -5
I'm not saying he should have no chain play, but anywhere around 1-2 in play is more than enough! If the chain gets too sloppy, it'll eat through the rubber.
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Post by scootnwinn on Sept 1, 2013 18:49:18 GMT -5
"Has little play" is a dangerously vague statement. Maybe you should just say to make sure it is within specification since you don't know what it is and have never owned one of these
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Post by prodigit on Sept 1, 2013 19:23:55 GMT -5
That last statement really does not matter. Or will you tell a scooter mechanic he can't work on a certain scoot, because he has never owned or worked on one before?
I own basically the same scoot, but in motorcycle shape. They're all the same. And there's sufficient clearance to go with a 30T sprocket if you wanted to do so (however it's not adviseable because of the gearing being too heavy).
How about the day you own one, you may be able to correct me?
I'm just saying that it doesn't matter squad if I say tighten the chain, or tighten the chain within manufacturers specs. If you don't know this, you shouldn't be working on scoots, there's a sticker on almost every motorcycle and scoot telling how much chain play the chain should have.
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Post by scootnwinn on Sept 1, 2013 19:45:59 GMT -5
You can correct me when you learn how to adjust your own valves. I have worked on a lot of bikes and though they are similar a wise mechanic opens a book with the proper specs no matter how many times they have worked on it, because similar and the same are far apart sometimes. You present yourself as authority repeatedly yet you have know real ability as is evident when you farm out simple operations on your own bike. You are arrogant when corrected admit you were wrong and move on. You were proposing modifications to the manufacturers specs the vagueness of your recommendations were potentially damaging. Be careful what you say people with less experience often take things at face value.
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Post by prodigit on Sept 1, 2013 19:59:31 GMT -5
Well similarly, when you have done a sprocket change to a scoot or motorcycle, you can correct me!
A valve adjustment has NOTHING, NADA to do with a sprocket change! Is like telling someone he can write a letter once he knows how to count!
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Post by scootnwinn on Sept 1, 2013 20:32:45 GMT -5
I have changed more sprockets than you will ever. I spent 4 years working in motorcycle shops... You?
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Post by cat0020 on Sept 2, 2013 6:37:07 GMT -5
OEM sprockets for BMS scoot is 38t rear, 14t front.
OEM sprocket combo chewed up the swingarm protecting plastic, so I went with 16/41 combo to get chain away from the swingarm.
Problem solved, higher top speed, lower engine rev, more usable 1st gear, better fuel econ.. it's all good.
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Post by prodigit on Sept 2, 2013 12:07:29 GMT -5
Yeah, on mine it's just a rubber over the swingarm. Mine came with a 15T stock, and with the chain even the least sloppy it was eating the chain.
On my Roketa, the 15T was the largest I could get, as it has 6 grooves. Anything beyond 15T has more grooves, so unless I find a compatible adapter, I could not go higher in the front.
With a 31T in the rear, the chain only went through a little of protection rubber, but is still far enough away from the swingarm itself.
I don't know why they used rubber on mine, and not plastic?
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Post by cat0020 on Sept 15, 2013 9:21:12 GMT -5
My scooter sat for couple of weeks while I was on a trip overseas.
Find out how it fairs in a few hours.
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Post by cat0020 on Sept 16, 2013 17:49:57 GMT -5
Scooter took a little choke to get started, other than that, runs flawlessly.
Cooler temp in fall weather seems to make higher speed smoother running.
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Post by prodigit on Sept 16, 2013 19:32:22 GMT -5
do you got a manual choke on this thing?
If so, when riding WOT, what does opening the choke do to the performance?
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Post by prodigit on Sept 16, 2013 21:08:17 GMT -5
I suppose the BMS is pretty much identical mechanically than the Roketa MC-05-127 I own;
On mine it seems the ball bearings in the sprocket adapter started to fail, they where not greased.
I'd recommend to take off the sprocket adapter, and check if those ball bearings are greased or not.
I only figured out when the sprocket felt a little loose, and on my trip it finally completely broke!
The dust sealing rings also broke, and the sprocket adapter itself got damaged, because the balls forced their way through the opening.
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Post by cat0020 on Sept 16, 2013 22:00:28 GMT -5
Not sure what you are talking about with the ball bearings and sprocket adapter.
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