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 Zuma 2008 50cc small problem 
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Post Zuma 2008 50cc small problem
I'm pretty sure this is only a carb problem, but I'm a bit of a newb so I want to make sure what it is before I go hacking at it.
The scooter runs fine at idle, low, and high speeds. It starts fine warm. But it doesn't start at cold. To start it I would block the airflow of the carb while starting it and it works almost instantly. Any solutions or theories? Thanks!


Sat Jan 05, 2019 4:46 pm
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Joined: Fri Aug 31, 2018 5:18 pm
Posts: 399
Location: Fox Valley Wisconsin
scooters and mods: 2 2004 Vinos 2004 Zuma
Post Re: Zuma 2008 50cc small problem
Assuming you are working on stock carb
Are you are reaching through the spark plug access hole and plugging the snorkle .
If that is the case your auto choke maybe stuck .
You will need to take the carb off a clean hose to blow into to see if choke will open .

On the forums here we have copies of the service manuals to reference .
http://www.zumaforums.net/downloads.html

If it is a manual choke from aftermarket carb it may just need a cleaning.

_________________
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 derestricted stock variator stock carb 72 mikuni main one clip rich
45 mph still breaking in 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 82 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


Sun Jan 06, 2019 4:37 pm
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Posts: 11
Post Re: Zuma 2008 50cc small problem
So actually it seems to be running instantly now without having to block the snorkel, but it is very weak on startup. I can confirm that the choke is working. I kind of have to electric start and then quickly throttle to stabilize it.


Sun Jan 06, 2019 7:24 pm
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Joined: Fri Aug 31, 2018 5:18 pm
Posts: 399
Location: Fox Valley Wisconsin
scooters and mods: 2 2004 Vinos 2004 Zuma
Post Re: Zuma 2008 50cc small problem
A Carb clean up would work wonders.
You most likely need to clean the pilot jet they plug pretty easy.
Piano wire or a guitar string and carb cleaner is what you will need to clean out the jets .
You can order new jets from your local yamaha dealer they are around 5 buck a piece .
What upgrades do you have now if any and do you have any planned for future .
pipes and bbks like bigger main jets and might need the next size up pilot jet .

_________________
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 derestricted stock variator stock carb 72 mikuni main one clip rich
45 mph still breaking in 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 82 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


Mon Jan 07, 2019 6:48 am
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