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Post by joaoeu on Jul 16, 2013 23:41:51 GMT -5
Instead of the mail order scoot, I picked up a leftover special from local scooter shop today. A 2011 model BMS 110cc Chinese SuperCub clone: How much did you pay for it? Yea, they don't look like they are very popular. The Z50 Clone Monkey Bikes seem to be more popular than that ... |
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Post by joaoeu on Jul 12, 2013 20:33:49 GMT -5
Try the washer/o-ring under the needle trick at least Speaking of this "washer/o-ring under the needle trick" that I have read for some time, anybody aware of a YouTube video that explains that? Thanks |
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Post by joaoeu on Jul 10, 2013 22:43:53 GMT -5
Here are the pictures of the 3 sides: 2 broken ones, and 1 good one. Attachments:
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Post by joaoeu on Jul 10, 2013 16:50:44 GMT -5
I dunno if it's the same scenario as yours, but I'm going to state my experienced parts failure.
I had a vibration riding home last night, it felt like I was a massage chair at 25-45mph (I have a 150cc China cheap-skoot).
It turned out to be the Clutch Assembly that started disintegrating, shedding metal pieces from its integrated metal bracket/spring. This was causing the unbalanced situation, creating the vibration.
That same metal where the clutch shoes are either clued or riveted to.
Of the three sides (for 3 clutch shoe pieces), two of the three had the metal springs disintegrating.
I will post the pictures once I get home.
Luckily, I had parts from a parts-bike I keep at home.
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Post by joaoeu on Jun 29, 2013 1:46:46 GMT -5
You should weigh your current roller weights, so you can make an educated guess what steps to do next.
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Post by joaoeu on Jun 28, 2013 22:50:27 GMT -5
Symba at times are listed on Craigslist for $1300, even from dealers. Therefore, if you were a true cheapskate, u would wait for the deal of the century ... Did u hear about the guy who went from San Francisco area to Alaska (Artic Circle) and back? Sure he did have problems, but the likelyhood of reliability problems on China clones would be even greater... www.advrider.com/forums/showthread.php?t=592359 |
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Post by joaoeu on Jun 26, 2013 3:06:46 GMT -5
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Post by joaoeu on Jun 25, 2013 13:33:23 GMT -5
i doubt 1 fin would hurt anything. if too many are missing then it could cause it to become unbalanced and it wouldn't circulate much air but you should be fine with one gone. of course that is just my opinion so you may want to order a new one just to be safe. 1 fin will not affect the cooling much, but it will affect the balance. Is balance important? I think only if you want your crankshaft to last long as possible. |
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Post by joaoeu on Jun 24, 2013 18:28:54 GMT -5
I think you're running it a little lean.
I ride a 150cc Lance Venice, it's a 10" donut in retro style (aka BMS Romans, SSR Metro).
When my scoot was running a little lean, I had to keep the idle at 1800-2100 RPM.
Also, when it was running lean, when running at 50-75% throttle, I could feel at times the engine misfiring once or two.
I did swap carburetors, because I wanted to verify my backup one worked.
I did adjust the Air-Fuel Screw again because it was another carburetor.
I set the idle initially to 1440rpm, it has slowed down slowly down to 1280-1320, but sometimes it will also idle as low as 1200rpm.
All without stalling at all.
My scoot only stalled one time, when for some reason, after stopping at a stop light, its idle speed was down all the way to 1000rpm, and right after that I tried to top the throttle up a little bit..
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Post by joaoeu on Jun 23, 2013 16:45:29 GMT -5
Have you checked the kill-switch wiring?
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Post by joaoeu on Jun 23, 2013 16:44:28 GMT -5
Could the engine be backfiring, and therefore, signaling that the air/fuel is too lean?
Adjust your air/fuel mixture accordingly to see if it will go away.
Just a guess ...
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Post by joaoeu on Jun 22, 2013 0:13:54 GMT -5
Are you sure it's the bearings?
Have you raised each wheel separately, and rotate it manually to try to feel any vibration?
Does the "metallic" noise happen when you run the engine while the bike stationary??
I don't mean to pour cold water, just trying to help u diagnose it.
If you run an engine for a while with a leaking exhaust, it will eventually damage the valves, and if keep on going, eventually the valves may damage the piston and cylinder themselves.
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Post by joaoeu on Jun 19, 2013 1:28:43 GMT -5
I'm not worried about having to bore out my cases, just dissapointed as I would have went bigger. Here is one thread of 61mm drop in mentioned scootdawg.proboards.com/post/490838Yea, but notice that his disclaimer would be that he says: "171.3cc kit for most GY6 125/150 engines" Notice the word "for most ..." But then again, at 2.5mm diameter difference, you could (with some patience), file it out by hand. You probably should add another 1mm of clearance or so, for that cylinder to be able to expand it when it's hot. |
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Post by joaoeu on Jun 18, 2013 13:19:22 GMT -5
The motors are cheap enough to repair/replace I may just run it and see how she holds up. True, but so are the roller weights. You can get them for $10/set (6 rollers), or $20 for a collection of 6x half-sets (3 rollers per half-set) to try out different combinations. China Cheap-skoots 150cc may last 67 miles, or it may last 26k miles. It all depends on the maintenance and luck of the draw on how proper the engine was assembled. |
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Post by joaoeu on Jun 18, 2013 13:06:20 GMT -5
My understanding is that 157QMJ cases (and possibly 152QMI) are "almost guaranteed" to only fit 58.5mm cylinders (up from 157QMJ's stock 57.5mm).
I don't know about 152QMI exactly, but I had an 80% that they were in the ballpark as well.
As for 60mm "drop-in" replacement, I've only heard about brand-name engines, such as Kymco, SYM, and Buddy.
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