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Strange
Dec 8, 2008 17:06:12 GMT -5
Post by sean1188 on Dec 8, 2008 17:06:12 GMT -5
i have come across a moped without rollers
im confused , is this there form of restriction ?
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Strange
Dec 8, 2008 20:14:15 GMT -5
Post by 90GTVert on Dec 8, 2008 20:14:15 GMT -5
Is it a chain drive or is the variator missing rollers? If the variator is missing rollers it should rev like crazy and not go very fast.
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Strange
Dec 13, 2008 17:56:56 GMT -5
Post by Aerostudent on Dec 13, 2008 17:56:56 GMT -5
Pics?!?! Some mopeds have chain drive and single speed or two speed trany (mostly the very old ones) that wouldn't need rollers, but most scooters have rollers. If it SHOULD have rollers and yet doesn't, then yes it would severly restrict it's speed. ;D
Again, Pics!!
Aero
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Strange
Dec 14, 2008 10:02:12 GMT -5
Post by jayhawk on Dec 14, 2008 10:02:12 GMT -5
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Strange
Dec 16, 2008 5:47:03 GMT -5
Post by motomech on Dec 16, 2008 5:47:03 GMT -5
That link didn't work for me, but I suspect, like Aero said, that it is a single speed like the Honda Spree and the Yamaha Razz. Those scooters were never intended to go more than 30 m.p.h. and that set-up works fine for them. They are a little slow off the line compared to a CVT though.
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Strange
Dec 16, 2008 18:31:46 GMT -5
Post by felliott on Dec 16, 2008 18:31:46 GMT -5
It does have rollers. The item number is 22 on the diagram.
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Strange
Dec 16, 2008 19:34:09 GMT -5
Post by cruiser66 on Dec 16, 2008 19:34:09 GMT -5
Hi sean1188,
This looks like a standard CVT setup with a variator (driving pulley) and centrifugal clutch setup very similar to the 139qmb and GY6 scooters that are very popular. But, like you said, there is something a little strange. There are two bushings in the variator (#22 and #26 on the diagram). Do any of you dawgs out there think that maybe one is a restriction? I only have one bushing on my 139qmb. Another thing I noticed is that the nut that holds the variator together is a 10mm like on the diagram in the generic shop manual offered for free on this forum. This leads to another question on my part. My variator has a 17mm nut. What would the correct torque be for tightening?? Sorry for piggybacking this question in here, but I didn't think it was worth starting another thread....
66
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Strange
Dec 16, 2008 20:37:36 GMT -5
Post by 90GTVert on Dec 16, 2008 20:37:36 GMT -5
This looks like a standard CVT setup with a variator (driving pulley) and centrifugal clutch setup very similar to the 139qmb and GY6 scooters that are very popular. The diagram is of a 49cc yamaha jog/minarelli 2 stroke's CVT. The original poster, sean1188, did not post that diagram btw. He also has not verified that his CVT is set up like that. Kinda hard to diagnose a problem on a mystery machine IMO. But, like you said, there is something a little strange. There are two bushings in the variator (#22 and #26 on the diagram). Do any of you dawgs out there think that maybe one is a restriction? Those are just bushings to go over the crankshaft. If there is a restriction in the CVT it would most likely be a spacer/washer between #26 nd #27 in that diagram. Another thing I noticed is that the nut that holds the variator together is a 10mm like on the diagram in the generic shop manual offered for free on this forum. This leads to another question on my part. My variator has a 17mm nut. What would the correct torque be for tightening?? Sorry for piggybacking this question in here, but I didn't think it was worth starting another thread.... I doubt that you have a 17mm nut on your variator. 10mm refers to the actual thread size, not the size of the socket/wrench you have to use. A 17mm nut would be huge. Use whatever torque specs the 139qmb manual suggests.
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Strange
Dec 17, 2008 0:41:54 GMT -5
Post by cruiser66 on Dec 17, 2008 0:41:54 GMT -5
Thanks for clarifying the confusion about the 'strange' scoot, 90GTVert. I thought that someone had verified the kind of scoot it was. Come on sean1188, give us a clue. I thought that maybe the specs for the variator were relating to the shaft size (10mm) but wasn't too sure. I was worried about the torque specs (28 ft/lbs) since my variator nut was installed with a 17mm six point socket. It really is a 17mm nut and, yes, it did seem kinda big. It looks like it might handle more than 28 ft/lb but I guess that really depends on the crankshaft threads.
66
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Strange
Dec 23, 2008 17:34:25 GMT -5
Post by sean1188 on Dec 23, 2008 17:34:25 GMT -5
well guys
i fitted rollers to it , as ya do and has gone back to normal. Have the Taiwanese not fitted them? , its a motoroma grand prix 50, it was made there i think, i have no info on the scooter, if any one has any to pass on that would be appreciated.
next thing, a big chunk of metal in the gasket/manifold where the exhaust fits, is it meant to be there? is it a restriction, it doesnt look like it should be there at all. lol
any help? please..
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Strange
Dec 23, 2008 17:38:05 GMT -5
Post by 90GTVert on Dec 23, 2008 17:38:05 GMT -5
next thing, a big chunk of metal in the gasket/manifold where the exhaust fits, is it meant to be there? is it a restriction, it doesnt look like it should be there at all. lol Sounds like a restriction to me. Is it in the exhaust or on the cylinder? I'd grind it out, but if it's in the cylinder you may wanna remove it to be safe. Metal debris isn't too good for your cylinder walls.
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Strange
Dec 23, 2008 17:43:42 GMT -5
Post by sean1188 on Dec 23, 2008 17:43:42 GMT -5
yeah and in the transmission there was no washer as i expected as on most scooters, could there be another restriction in the transmission?
thanks in advance
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Strange
Dec 23, 2008 17:52:32 GMT -5
Post by sean1188 on Dec 23, 2008 17:52:32 GMT -5
OMG it looks exactly like the lambretta uno lol
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Strange
Dec 23, 2008 19:07:06 GMT -5
Post by jayhawk on Dec 23, 2008 19:07:06 GMT -5
That's what I was trying to tell you from the start! It IS the lambretta uno (minus a few upgrades Lambretta throws on it - for example, my Due (which has your same engine) came derestricted). The Lambretta uno is the ADLY Thunderbike.
Eric
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Strange
Dec 24, 2008 12:38:30 GMT -5
Post by sean1188 on Dec 24, 2008 12:38:30 GMT -5
thanks .. did yours come with a big blob of metal in the exhaust manifold.??
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Strange
Dec 24, 2008 13:16:31 GMT -5
Post by jayhawk on Dec 24, 2008 13:16:31 GMT -5
Mine came with a performance exhaust, so no, mine didn't have that, but what you're describing is a common restriction.
Once you get the restrictors all gone (and I'm clueless on them since mine came de-restricted), your scoot should get close up to 45 mph on the flat depending on your weight. I'm 175, and I've hit 46.
You've got yourself a nice, Taiwanese made, scooter.
Eric
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Strange
Dec 24, 2008 14:39:13 GMT -5
Post by sean1188 on Dec 24, 2008 14:39:13 GMT -5
i dont mean inside the exhaust , i mean in the actual engine. the section that the exhuast connects to. sorry ive totally forgot its name.
havent been into scooters for a long time lol
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Strange
Dec 24, 2008 14:47:05 GMT -5
Post by 90GTVert on Dec 24, 2008 14:47:05 GMT -5
i dont mean inside the exhaust , i mean in the actual engine. the section that the exhuast connects to. sorry ive totally forgot its name. The exhaust connects to the cylinder at the exhaust port.
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Strange
Dec 24, 2008 14:48:36 GMT -5
Post by jayhawk on Dec 24, 2008 14:48:36 GMT -5
I've never taken apart anything on my scooter since it's been trouble free...the most I've ever done was remove the lining in the compartment beneath the seat (found the battery there - wasn't look for it, but there it was) and remove the plastic cover to add 2 stroke oil. So...I have no clue.
How is the performance on your scooter? What's your top speed these days?
Eric
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