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Post by irish on Aug 25, 2014 12:02:37 GMT -5
Bought this scooter at a yard sale for my daughter. Owner said won't start, no spark, bad CDI. Got it home swapped the battery, pumped out the old gas, put in premium gas, added a little Seafoam, gave a small shot of ether and it started. As soon as the ether ran out it died. To me this meant fuel issue not spark issue. Ordered new carb and fuel filter and installed. Will start now but won't accelerate. Followed Lefty's instructions on setting fuel mix screw and idle screw. Will run all day at idle but won't accelerate. Read more and decided valve adjust was next. In process accidently I left the valves loose and they were tapping badly but it did accelerate. All of this is on center stand only. Did not run more than about ten seconds. Shut off and adjusted valves properly at .004" intake and .005" exhaust. Idles fine but is back at no power no acceleration. Baffled, acceleration with loose valves seems to indicate that fuel supply is good and proper? Will bad CDI cause this type of problem? Any help is greatly appreciated.
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Post by oldchopperguy on Aug 25, 2014 12:47:04 GMT -5
Irish,
Welcome to the site!
I have no experience with the 50's, but learned more than I ever wanted to about the GY6 150, and they're pretty similar... LOL! It sounds like you have a fuel issue, BUT... a CDI "going bad" can cause any number of problems, including poor/no acceleration. And factory CDI's DO go bad... Very often!
My original CDI "went bad" over a 6-month period (the first six months when new...) and I spent WEEKS trying to adjust the carb, to get lost power back, stop popping, stalling, etc. With all that to NO avail, I finally got a "red" CDI off eBay and I was back in business. For years, I kept a spare CDI on hand. And please note: The CDI will NOT tolerate any water... Even though they look like they're sealed well. A spray-wash will kill one INSTANTLY. Trust me, I KNOW from experience, and pushing the scoot home.
I would think that with a new carb, it should accelerate (some) even if the new carb is WAY off in jetting.
My old 150 exhibited VERY poor acceleration with the stock air-filter setup. I would recommend doing any carb adjusting with the entire air-filter assembly off, and when it's running right, put the air-filter assembly back on. If THAT ruins performance, remove it and go with a simple "UNI" filter.
While you're at it though, I strongly recommend replacing the current CDI. They aren't expensive, and a good, no-rev-limit CDI did WONDERS for my old 150.
You really have to painstakingly try one thing at a time until you find the offending part... And sometimes, it's an infuriating COMBINATION of things... Irritating, but definitely part of the "Chinese experience". These Chinese scoots are SO cheap, especially used, that they're definitely worth some serious tinkering to get them right. Once you get them "right" they often provide many years of trouble-free riding.
C'mon now, let's hear from the 50cc experts!
Ride safe,
Leo in Texas
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Post by irish on Aug 26, 2014 8:49:31 GMT -5
Thanks chopper guy. I have a new CDI ordered. I didn't get the no rev limit as it will be mostly driven by my daughter. I think I will let her get used to it and then order a no rev as a spare. Appreciate the info on the air filter, I will keep that in mind. I originally purchased the scooter on a whim, had no experience with them other than I had one when I was 15. That would be 47 years ago. I am really enjoying tinkering with this scooter I like fixing things and used to enjoy working on old cars but they have become so complicated and you can't get at half the engines. But this little motor is so simple and easy to work on. But it does have some unique problems. That's why I joined this site, the members seem to have a wealth of information and knowledge and I am always ready to learn. And I have learned a lot so far. Thanks Again.
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Post by alleyoop on Aug 26, 2014 12:14:46 GMT -5
Check the CVT take the cvt cover off and start it up and goose it and watch the variator and the belt, it could just be the weights in the variator maybe they are stuck or maybe none in there or only half of them for all you know. also it could be the belt is all worn. Here is a video on how it should be working.
Alleyoop
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Post by oldchopperguy on Aug 26, 2014 12:33:13 GMT -5
Thanks chopper guy. I have a new CDI ordered. I didn't get the no rev limit as it will be mostly driven by my daughter. I think I will let her get used to it and then order a no rev as a spare. Appreciate the info on the air filter, I will keep that in mind. I originally purchased the scooter on a whim, had no experience with them other than I had one when I was 15. That would be 47 years ago. I am really enjoying tinkering with this scooter I like fixing things and used to enjoy working on old cars but they have become so complicated and you can't get at half the engines. But this little motor is so simple and easy to work on. But it does have some unique problems. That's why I joined this site, the members seem to have a wealth of information and knowledge and I am always ready to learn. And I have learned a lot so far. Thanks Again.
You're most welcome!
I'm glad Alleyoop also noted the CVT tranny. They are amazingly simple, yet when not right, they can give fits. I'm an old, OLD Harley guy from "back in the day". I also liked scooters of the era, like you.
As irritating as Chinese scooters can be, I believe they are still WAY ahead of the stone-age Cushman, Vespa and Lambretta scooters of the fifties. (Of course, we know nothing modern is as totally cool as a Cushman Eagle... LOL...) Replacing points and condenser ignitions with a CDI, and replacing complex clutch and gears trannies with a CVT has made today's scooters much more trouble-free and easier to maintain.
Not to mention MORE AFFORDABLE!!!
A Cushman, or Italian scooter of the fifties STILL cost around $600 or more, back THEN... THAT is over $6,000 in TODAY'S bucks. Yet, we can still get a Chinese 50-150cc scooter for around $1,000 brand-new! Sometimes even less! THAT is only a hundred bucks in 1950's dollars. Pretty sweet!
Please keep us posted... If you encounter more trouble, let us know, and surely SOMEBODY who's solved your same problem will have an answer for you.
Ride safe!
Leo in Texas |
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Post by irish on Sept 1, 2014 12:06:21 GMT -5
Thanks Alley,
Do you have any suggestions on how I can remove the staring gear. The center appears to have a plastic cover piece and I am afraid of breaking off a gear if I try to put anything on the gear teeth. I have seen where they use a spanner wrench on the clutch but that doesn't keep the starter gear from turning. I want to check the weights but can't get that starter gear off. Thanks for your help.
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Post by gatekeeper on Sept 1, 2014 12:30:15 GMT -5
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Post by irish on Sept 7, 2014 9:09:08 GMT -5
Thanks everyone for your help.
Gatekeeper, thanks for the tip. Used my air impact to get the nut off. worked fine.
To reiterate all I have done. The scooter wouldn't start unless I used a little ether, seemed like a fuel issue so I pumped out the old gas, put a new fuel filter on, put in new gas, premium, added a little seafoam, got a new carb and put it on. Then it would run at idle but bogged when I accelerated.
Gapped the valves per Lefty's instructions. Ran a little better but no acceleration, still bogged.
Set the fuel air screw and idle screw also per Lefty's instructions idled better and would accelerate a little better but scooter wouldn't move under it's own power.
Got a new CDI put it on. Got a new plug and put it in. Still no power.
Took off CVT cover cleaned that out, some rubber/dirt on inside. Belt looks good, fairly new. Cleaned CVT air intake. Took off variator and checked roller weights. They seem fine. Wiped out roller seats to make sure no debris was causing them to stick. Put it all back together. After all of this the scooter will move on it's own but will not go up the slightest grade nor will it accelerate quickly or go over about 10 mph. The belt is not slipping, it is the engine isn't accelerating.
Any ideas?
On a side note, when I first got the scooter it would start with the starter. Then it started to sound like it was binding and then starter would not work. Took starter apart. It was corroded inside but brushes looked good. Also when I took CVT cover of I found the bushing for the starter shaft that is supposed to fit into the cover had come out and was laying in the bottom of the CVT cover. Cleaned it all up and put just a dab of grease on both bushings and on the shaft where it fits into the bushings.
When I put it all back together the starter spins but will not throw starter gear into the teeth of the starting gear. Took the CVT cover off and watched the starter to see if it was turning backwards. Seemed like it was, but the wires to the starter on where they were originally. Now I am wondering if my battery just doesn't have enough power to throw the gear into the starting gear. Will work on that later.
Thanks for your help.
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..BAD TO THE BONE..
