Chinese Scooter Club

bountyhunter · Wed Jul 16, 2008 4:38 pm Solana Scooter

I recently bought a Solana model YY50QT-6 50cc scooter, when I took it to the shop to get the gearoil changed and get it peaked out I found it had some problems, bad timing belt etc, got it fixed and made seller re-imburse me for exxtra cost...also found out vacuum line from air filter to carb was missing, replace it, I have almost 1000 miles on this bike but cant get it to go over 30mph sometimes with throttle wide open it acts funny like it wants to go faster but then wont, kinda a lurching action I use super high test gas and I have cleaned air cleaner, changed the cranckcase oil etc...it starns and runs fine just can't seem to get enough speed out of it, It only has 5 wires so no electronic restriction on it, any suggestions?

halley · Wed Jul 16, 2008 4:47 pm

You mentioned the CDI but have you looked at the other likely restrictions?

The only wrinkle here is that you mention it "wants" to go faster, with a surging action. Mechanically, I'm too new to this to understand how any of the existing restriction methods would cause lurching or surging, but I'm wondering if this is in the clutch or variator. Clutch-slippage would feel like surging or lurching.

jpmacd733 · Wed Jul 16, 2008 4:49 pm Re: Solana Scooter

bountyhunter wrote: I recently bought a Solana model YY50QT-6 50cc scooter, when I took it to the shop to get the gearoil changed and get it peaked out I found it had some problems, bad timing belt etc, got it fixed and made seller re-imburse me for exxtra cost...also found out vacuum line from air filter to carb was missing, replace it, I have almost 1000 miles on this bike but cant get it to go over 30mph sometimes with throttle wide open it acts funny like it wants to go faster but then wont, kinda a lurching action I use super high test gas and I have cleaned air cleaner, changed the cranckcase oil etc...it starns and runs fine just can't seem to get enough speed out of it, It only has 5 wires so no electronic restriction on it, any suggestions?

Try here:

http://chinesescoots.forumwise.com/chinesescoots-thread29.html

15 pages in that thread, but you will learn a lot. :D

Joe

bountyhunter · Wed Jul 16, 2008 4:54 pm

I have been to that site several times and all that is listed there has been done, I paid a local reputabble scooter shop to do this and make it go as fast s possible, I did have someone sabotage it a wh ile back they cut a gash in the rubber elbow connecting the carb to the motor and I fixed it with silicone seal also had gas running backwards into air cleaner had that fixed (stuck float), acts like it is either not getting enough gas or not enough air just can't figure out which.

jpmacd733 · Wed Jul 16, 2008 5:26 pm

bountyhunter wrote: I have been to that site several times and all that is listed there has been done, I paid a local reputabble scooter shop to do this and make it go as fast s possible, I did have someone sabotage it a wh ile back they cut a gash in the rubber elbow connecting the carb to the motor and I fixed it with silicone seal also had gas running backwards into air cleaner had that fixed (stuck float), acts like it is either not getting enough gas or not enough air just can't figure out which.

OK, so the typical restrictors were not found. Your scoot should be doing 40 mph or something is not right. The thing is, everything needs to be in good working order to get ALL that the little engine has. Very few vehicle's are run at full throttle as much as our little 50 cc scoots.

Air cleaner needs to be clean - no air restrictors in the air box. Right?
The main jet is a #79 or #80. Right?
There is no excess slack in the throttle cable to prevent the throttle from opening all the way. Right
There is no physical attachment to the carb that stops the throttle from opening all the way. - did you check?
What color is the plug? white, tan, or black? Could be running rich or lean.
The carb diaphragm in good condition? no holes?
No screw in the top of the cap for the diaphragm that would restrict the CV from opening all the way?
Checked for the restricting ring in the variator?
Your CDI has just one green wire? Five wires and restricted is possible.
Have the valves been adjusted? Lots of power loss if one is tight.

That should be a good start.

Joe

bountyhunter · Wed Jul 16, 2008 5:37 pm

most of all of what you stated is right now the CDI has just five wires but yes one green wire in the position that it states the pink wire should be if it had six wires, ould this green wire be a restrictor wire anyhow?, should I disconnect the green wire and see even though there are only 5 wires?

jpmacd733 · Wed Jul 16, 2008 7:55 pm

bountyhunter wrote: most of all of what you stated is right now the CDI has just five wires but yes one green wire in the position that it states the pink wire should be if it had six wires, could this green wire be a restrictor wire anyhow?, should I disconnect the green wire and see even though there are only 5 wires?

That pin on the CDI is used for the restriction input but it depends where that wire goes and what kind of signal it feeds to the CDI. You could disconnect it from the connector plug and try. You should be able to use a pin to release the lock inside the connector for that wire and if it does not work out, just push it back in.

However, the CDI connection I was thinking about was one with two green wires and no black/white wire. That would still be 5 wires but in this case the one less wire was the black/white and not the restrictor.

So, "most" of what I asked was checked. How about a list of what you have checked and eliminated as a restriction. May be able to see something you may have missed.

Joe

bountyhunter · Thu Jul 17, 2008 4:13 am

Basically the shop said all the things you state withe the carb, pulley etc was done when I had it peaked and tuned at the time the gear oil was changed, however like I said when the float stuck the gas leaked back out of the carb and throught the air cleaner, even though I cleaned it do you think if I replaced it this would help?, also since I had problems to begin with and also the dabotage that was done is it possible that even after 993 miles it could still be breaking itself in, I mean it starts perfectly, it idles fine and sounds fine while running, the only problem I have is once it gets to 30mph with the throttle wide open it wants to hesitate back and forth, if I let off of the throttle and maintain 30 mph it runs fine..I have made two oil chnges and the last one was at 900 mph and I could still see fine particles in the spent oil..I have owned a number of Tomos mopeds and was able to work on them fin but unfamiliar with carb etc on this scooter, also wasn-t able to find proper vacuum hose so I have a ridgid plastic tube that will fit into both receptacles on the filter and the carb is it possible I don't have the right inside diameter slowing the air flow, would this cause this as well? these are the only things I can think of....appreciate all the help as I am planning a 210 mile tripo to a military re-union with it in Oct and 40 mph would be a lot shorter time than 30mph.

scooterbikeguam · Thu Aug 07, 2008 2:08 pm

Hey Bounty Hunter..did you ever figure how to de restrict your Salona?? I Have a new 2008 NST its same as your scooter just diffrent name I guess..anyways I'm having problems with my scooter as well only topping 30 mph. let me know what you figure out to increase the speed on yours
thank you
Dave[img][/img]

scooterbikeguam · Sun Aug 10, 2008 11:37 am

Hey Joe I like to know if the green wire on the CDI still applys for the newer 139QMB scooters like my NST YY50Q
Dave[/img]

jpmacd733 · Sun Aug 10, 2008 12:23 pm

scooterbikeguam wrote: Hey Joe I like to know if the green wire on the CDI still applys for the newer 139QMB scooters like my NST YY50Q
Dave[/img]

Yea Dave, I would like to know as well. I talking about the green wire that is attached to the "pink wire" pin on the CDI.

I don't have a scoot with that so can't really test what it really does. I have suggested before that the scoot could be tried with that wire disconnected but have never got any feedback on how that works out. I have also suggested, maybe, someone could follow that wire to see where it goes. Green wires on our scoots is usually a ground wire but it would be nice to confirm.

Have a go and see what you can learn. :D

Joe

scooterbikeguam · Sun Aug 10, 2008 1:05 pm

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bountyhunter · Fri Aug 15, 2008 11:51 pm

scooterbikeguam wrote: Hey Bounty Hunter..did you ever figure how to de restrict your Salona?? I Have a new 2008 NST its same as your scooter just diffrent name I guess..anyways I'm having problems with my scooter as well only topping 30 mph. let me know what you figure out to increase the speed on yours
thank you
Dave[img][/img]
Nope I haven't figured it out either, have had some health problems so havent tried much lately but the green wire runs back to to negative side of the tail and brake lights so disconnecting it wont work, I am still omly able to get 30-35 mph when it gets to 35 it kinda acts like it wants to go faster but it won't take full throttle it wants to kinda jerk faster and slower back and forth, if I put it up on kickstand and run it wide open same thing it runs fast then slow then fast again like it won't accept the gas., if I could get it to run full throttle without this I believe I could get 50 mph out of it just can't figure out what to do..if you figure it out let me know..it runs perfectly just wants to stall back at 35mph and half throttle..hope this helps...

larry8 · Sat Aug 16, 2008 12:36 am

It sounds like the restriction is in the CDI. If the CDI is speed restricted it will cause the motor to "hunt" at top speed.

bountyhunter · Sat Aug 16, 2008 12:55 am

larry8 wrote: It sounds like the restriction is in the CDI. If the CDI is speed restricted it will cause the motor to "hunt" at top speed. thats what I thought too but how do I correct this, 5 wires go to the plug at the CDI