139QMB Wont Start, Clutch?

grepper · 10-08-2014, 08:35 AM

HI, this is my first post, I hope you guys can help me out. First off, I'm not a noob at fixing stuff, I've rebuilt and restored a few motorcycles, but this is my first scooter.

My sister gave me this scooter when it stopped working. Don't you just love free stuff.. At first I couldn't find much about it, it's a 2004 Wahoo. Then after reading, I found it's a generic Chinese Scooter with a 50cc 139QMB motor. I found a manual and went through the trouble shooting guide. Turns over, Fuel, Spark, Compression... ect. Got all that. I even bought a new CDI and Coil for it. I could get it to pop, but not run. After banging my head for several weeks, and reading posts on forums, I tried something I hadn't before. I removed the drive belt. And she fires up!

So, what it appears to me is that the Clutch is worn out. It's grabbing at a way low rpm and giving too much resistance for the motor to even warm up.

Is that an accurate assessment?

So, If that's it. What springs are suggested? Should I mess with the variator too?

mmsscooters · 10-09-2014, 02:05 AM

Yes, that can happen, if the bike rolls free with the motor off then at least its not your gears, when you turn it over on the ground with the electric start does the bike move foreward? If so your clutch is stuck open and would cause most bikes to fail

dwint51 · 10-09-2014, 07:16 AM

t springs werent compressing the clutch and was tight on the clutch bell.bought new springs and problem fixed

grepper · 10-09-2014, 09:52 AM

Took the clutch off and got that big nut off to I could take a good look at the springs. The pads are all still there and so are the springs.

So, do ya think it could still be the clutch?

grepper · 10-13-2014, 10:59 AM

Variator was gummed up and stuck in high. Cleaned and lubed, now it's working great.

kz1000st · 10-13-2014, 01:22 PM

Way to go. These things are fairly simple, most problems are usually minor and related to things gumming up. The 50cc engine is a pretty stout unit and will give you lots of fun.

10-09-2014, 02:05 AM	#2
mmsscooters Join Date: Feb 2014 Location: las vegas Posts: 100	Yes, that can happen, if the bike rolls free with the motor off then at least its not your gears, when you turn it over on the ground with the electric start does the bike move foreward? If so your clutch is stuck open and would cause most bikes to fail __________________ 2012 Jonway X 44mm Hoca crank 52mm Hoca big bore MMS big valve head raised ports, polished, milled .023 Hoca 26mm carb NCY titanium valve springs NOS wet nitrous system Holley fuel pump MMS variator Naraku CDI HT coil 4' Wheelie bar MMG stainless slip-on exhaust NGK "11" spark plug UNI filter 2014 Icebear Maddog too much to list http://mmsscooters.com
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10-13-2014, 01:22 PM	#6
kz1000st Join Date: Oct 2008 Location: Hyde Park, NY Posts: 1,058	Way to go. These things are fairly simple, most problems are usually minor and related to things gumming up. The 50cc engine is a pretty stout unit and will give you lots of fun. __________________ 2008 Eagle Milano 150- 9,679 miles 2009 Honda Rebel 250- 10,434 miles 2009 CF Moto Fashion- 16,023 miles 2009 MC-114 50cc Cub Clone- 4,317 miles twowheeler.yolasite.com/ That's 30,049 China Scootin miles and Counting.
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10-09-2014, 09:52 AM	#4
grepper Join Date: Oct 2014 Location: Michigan Posts: 3	Took the clutch off and got that big nut off to I could take a good look at the springs. The pads are all still there and so are the springs. So, do ya think it could still be the clutch?
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