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 50CC Yamaha Zuma won't crank/roll over 
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Joined: Mon May 20, 2019 12:02 pm
Posts: 1
Post 50CC Yamaha Zuma won't crank/roll over
First time poster... long time lurker... Last year I was basically given a 2006 Yahama BWS 50CC scooter. At the time when I got it from what I could tell all it needed was to have the carb cleaned, maybe a new spark plug, new battery... nothing crazy but I do recall giving it more than a few kicks on the kick starter at the time I got it.

Fast forward to now... It's the long weekend and I decided to take a stab at getting it running. I got a new battery installed, new fuel, I got the carb cleaned up and went to go start it up when I discovered that neither the electric start or the kick start seem to be able to roll the engine over. I hesitate to use the term seized but it certainly seems that way.

I'm wondering what I should do as a next step to try to figure out whats wrong? Any thoughts or suggestions are appreciated.


Mon May 20, 2019 12:49 pm
Silver Member
Silver Member

Joined: Fri Aug 31, 2018 5:18 pm
Posts: 624
Location: Fox Valley Wisconsin
scooters and mods: 2 2004 Vinos 2004 Zuma
Post Re: 50CC Yamaha Zuma won't crank/roll over
Just to make sure that it is seized before you tear the cylinder down
Take off the cvt cover and turn it over with the key if you dont see the front variator fan moving .
Then try to move the pulley by hand .

The next step will require alot more strip don of the zuma and looking at the condition of the cylinder .

2004 Vinos Derestricted exhaust and variator stock carb with mikuni 70 main jet needle down 1 clip 40 mph
Athena Sport BBK waiting to go on

2004 Vino Malossi sport 70cc Malossi Wild Lion pipe malossi multivar 6.5 sliders green polini clutch springs stock carb 75 mikuni main one clip rich 47.5 mph Michelin S1 90/90/10 rear tire Michelin S1 3" x 10 up front

2004 Zuma Malossi sport 70 cc Technigas next r 2008 zuma torque driver polini high speed variator 5.5 grams sliders malossi delta clutch yellow contra yellow clutch springs Stock Carb 84 main jet 46 pilot jet needle 1 clip rich stock athena 14/42 gears 11 to 1 final ratio 56 mph

2005 Eton Beamer (Taiwan Zuma Clone) Airsal sport 70cc 9200 peak rpm top speed 42 77.5 mikuni jet needle 1 clip rich (sold)

Mon May 20, 2019 1:25 pm
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