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 Newb introduction - 2005 Zuma 
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Joined: Sat Apr 29, 2017 7:27 am
Posts: 1
Post Newb introduction - 2005 Zuma
Just picked up a 2005 Zuma with aftermarket pipe, carb and roller weights. As soon as I got it home I tore the CVT cover off to see what I was working with. It has a brand new Yamaha drive belt and when I separated the variator, the roller weights were pink colored. I'm assuming they are not stock. I didn't have anything to weigh them with to determine what weight they are. I'm assuming it's a stock 40mm bore 50cc cylinder, but I haven't torn it apart yet. I was wondering if there is way to visually determine if it's OEM 50cc cylinder versus an aftermarket 70cc cylinder. I realize I could take the head off and check bore size, but I don't want to end up having to purchase a new head gasket. Being new to scooters, I don't know where all the cost effective places are to purchase parts and accessories.

Also, does anyone have an opinion on the welding of this pipe. Is this the way they come or did someone reweld this?

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Sat Apr 29, 2017 9:06 am
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Joined: Wed Mar 25, 2015 11:44 pm
Posts: 124
Location: East Bay CA
Post Re: Newb introduction - 2005 Zuma
Welcome. It looks like someone already had their way with that scooter... The only way to truly determine bore size is to take it apart and measure. I would also make sure the main jet is up to the task with that cone filter in place too. What kind of carburetor is that?

1990 Yamaha Jog CG50-CW50 swap
1992 Yamaha Jog CY50-stock
2000 Honda Elite SR50-72cc Corsa, Arrow, OKO24, Polini vari, 8.4:1
1995 Suzuki Intruder VS800
2014 Yamaha FZ-09

Sun Jun 04, 2017 2:04 am
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