Yamaha Zuma 50F Before and After Polini Big Bore Kit + Performance Parts

Here are my results of what the Polini Big Bore Kit can do on a 4 Stroke (4T) Yamaha Zuma 50 (BWs for the rest of the world lol)
Here’s a list of all the parts in put in it.
Polini 66cc BBK
Polini Performance Air Filter
Polini Variator with 6.9g Rollers
Malossi 13/44 Up Gears (Transmission)
Malossi White Contra Spring (1000 RPM)
Koso 1000 RPM Clutch Springs
It does have a higher top speed than showed in the video. I ran out of road. this also has the same engine as the Yamaha C3 aka Vox aka Giggle as the 2007-2011 models.
The Yellow Malossi Contra spring wasn’t working well and I also took out the Malossi Racing X Belt after about 100 miles and stock belt actually gave me a 2 MPH increase.
On flat I’m going about 47-48 MPH and down a big hill I have GPS’d it at 54.4 MPH and still not hitting the Rev Limiter when before the kit I would hit it at 43.3 MPH. I’m gonna try Dr Pulley Sliders in the future. If you have any questions then feel free to comment and I’ll answer them as soon as I can. Thanks.

[@MikehooksEm]

With the beastmode efi tuner work on my 2012 Zuma

[@gvidasnarkus2612]

i also gonna try to tune my yamaha neos 4T,i already have malossi variator,malossi spring,and little springs 1000rpm,and flatout its 60km/h,i had hittet 80km/h but down the hill,so i think the only good solution is to buy polini or malossi transmision gears

[@hybridorbital85]

Awesome video. I've got a 2015 Vino and suffer from the same slow speed/acceleration. It's still really fun and I love it, but I need to better keep up with traffic. I've been looking into big bore kits and am gravitating toward either the 70cc or 75cc, but I wonder if I have to get a head at that point. I will definitely have to get a fuel controller to give more fuel, but I wonder if I have to get the head with the bigger valves too. What made you choose the 66cc? Seems like a noticeable improvement, but I bet you're running a bit lean. Have you checked your plug? Did the new rollers make a difference? I'm super stoked about doing this to my Vino!

[@WetnwildhjReturns]

hybridorbital85 Thank you, and yes your vino has the same engine as the 2012+ Zuma’s so all these parts would work for you. I haven’t checked my spark plug but I probably am running I bit lean because I also have a better Polini Air Filter installed so I just switched my engine on/off 3 times rapidly within one second to reset my ECU. There’s no 70cc kits for these engines but there is a 75cc kit that comes with the head. It’s by SSP-G I believe and maybe one other company and both around $450 and yes you’d need a fuel controller. I went with the Polini cuz I got it for $250 and came with the fuel regulator so I didn’t have to buy a fuel controller. The malossi BBK is also 66cc but more expensive and has a complicated fuel controller. I also was told the Polini and Malossi kits were 70cc but found out later that they’re both 66.4cc

[@WetnwildhjReturns]

And the rollers are 6.9g so it still accelerates faster than when it was stock but I am gonna try 4.5g sliders and 6g sliders to see which ones will be best as well as some 130/90-10 Michelin Bopper tires for smoother rides and possible speed increase

[@lukasoverton2739]

Have you tried an exhaust upgrade?

[@zuradalakishvili7821]

Hey dude in the video i see that you have a Malossi yellow Contra Spring 1500rpm, but in the description of the parts There is written White contra spring, so the yellow doesn’t fit right?

[@WetnwildhjReturns]

Zura Dalakishvili it fits just doesn’t work well with my set up. It’s a bit too stiff so I switched to the white spring

[@zuradalakishvili7821]

Joshua Burukkusu thanks for your respond, and where did you get that can you please text the exact model of the spring please

[@WetnwildhjReturns]

Zura Dalakishvili I don’t have the model number. I bought mine on drow sports website. Just typed in Zuma 1000 spring. Was like $15

[@Tradeofjane]

How has your cylinder held up? I have the same kit but the gasket that came with it between the crankcase and cylinder failed causing nearly all the oil to leak out, which caused the piston to seize damaging it and the cylinder wall. I had to carry it back home 8 miles in 90+ degree weather. By the way, Kitaco sells a fuel injector that you can just plug in for the Jog 4T, which uses the same engine as the Zuma 50F. I was able to install the Polini regulator but it's difficult and not worth the risk of damaging the fuel pump.

[@WetnwildhjReturns]

I haven’t had any issues with mine. I switched to the Charmo 75cc kit and that was a nightmare. It kept overheating. Switched back to my polini kit along with a fuel controller and the polini fuel regulator and still no issues. It over heated one time during its first few months but hasn’t again. And the was summer 2018 that I had it installed. I still drive it. Just drove it around the other day. Top speed down hill was 60 MPH GPS confirmed but I usually do 45-50 on smooth flat roads with no head wind

[@Tradeofjane]

​@@WetnwildhjReturns I was thinking about getting one of the 75cc kits but decided to port the stock head instead. I think my problem may have been not adding a crankcase breather to the oil fill plug, which caused the pressure to build and the oil to leak. By the way, Dog House makes a bottom drain plug cooler for the S-Max that fits the Zuma 50F. I just got mine in a week ago.

[@Voltermort]

my stock 2 stroke BWS 50 does 69kph on flats

[@Tomijus]

My stock 4 t chineese 50cc does 65kph on flats

[@kospencer1]

Bro, what’s the name of that aftermarket cargo rack you have on your scooter?

[@WetnwildhjReturns]

SHAD is the one that I have. They make nice top boxes for scoots

[@iamjeromeflores611]

Any links for your parts?

[@anaickaube17]

And put a malossi cdi for fuel control because its running lean and the cdi will raise the rev limiter higher

[@WetnwildhjReturns]

Anaïck Morin I installed the beast mode fuel tuner by rolling wrench Denver and it idles a lot better and top speed with the new rollers is now 56.9 mph downhill

[@Col205]

What rpm are you doing at top speed?

[@WetnwildhjReturns]

Col205 no idea because I don’t have a tachometer on it but I did just install a fuel tuner that tells me my rpm but I keep it under my seat

[@BassetCat1]

If you’ll use the Gates Power Link PL30207 Belt you’ll pick up top speed. It’s the best overall belt for your Variator....Gabe🇺🇸

[@WetnwildhjReturns]

Thanks Gabe. We’re also friends on Facebook lol I researched a lot of forums when I was looking up how to increase speed and saw a lot of your posts. Very helpful

[@joerivamonte3004]

May I ask what kind of mirrors are those?

[@WetnwildhjReturns]

Joe Rivamonte the little blue ones? Shitty ones that’s what kind lol I took them off and went back to stock

[@fdskrider]

I have a 2012 zuma 50f and it won’t go over 40 no matter what, anyone know how to fix that?

[@WetnwildhjReturns]

Take the little washer that’s behind the variator out and that will solve your problem. You’ll gain a good 5 mph. Mine topped out at 38 mph when the washer was in and went to 43 on flat after I removed it.

[@MikehooksEm]

Same thats happening to me I use to go way faster and I think the washer is out

[@Aj-om4dt]

Lighten your variator weights 6.5g is too heavy especially for a 4T.. when you get a pipe & a bigger carb & quick action throttle ect then 5g-5.5g is the heaviest weight to put in. I’ve got a Yamaha 1995 zuma FULLY built stage6 70 setup crank primary & secondary gearing kit Big stage6 intake polini cp21mm carb full stage6 cvt & I’m using 5.5 16x13 rollers I’ve got the green springs in my stage6 clutch & medium contra spring Yasuni c16 pipe I’m running 17whp

[@themagicphoneboothq4529]

Hey you seem to know a lot about mopeds, I have a 05 bugeye and I’m trying to get it going as fast as possible, I have a budget of 1200$ what updates would you recommend Edit: I’m 150 pounds

[@mlw19mlw91]

I still dont understamd my zuma 50f topped.out at 47mph stock with the restrictor washer removed. Did yamaha change the rev limit or tune durint it's lifespan? Yours obviously accelerates much better but damn that top speed tho

[@WetnwildhjReturns]

Michael Woodcock yeah but are you doing 47 GPS or just reading your speedometer? Cuz the speedometers are 3-5 mph generous and very inaccurate. Also I’m not hitting my top speed in the video. I’m only running it for like 30 seconds and it takes my scooter a full minute to reach top speed

[@mlw19mlw91]

@@WetnwildhjReturns 47mph indicated. What is your indicated top speed? I guess it's hard to tell after 47 but if you could guess? What's your gps top speed? I'll gps mine amd see if these mods are in my future :)

[@WetnwildhjReturns]

Michael Woodcock my indicated top speed on the speedometer is a mystery to me because my speedo gets buried lol but god on flat is usually 47-48. I can do 51 on flat for awhile after I’ve come down a hill but my very top speed downhill is 57 mph GPS

[@mlw19mlw91]

@@WetnwildhjReturns i just did the polini variator on mine. Gps top speed is 49mph, other direction 45, so 47mph average top speed. Slow acceleration compared to you tho, would you do all your mods again? I'm very much considering them

[@WetnwildhjReturns]

So doing the big bore kit with the Variator and new up gears my speed can reach 55 mph but that never happens on flat. The big bore kit is good if you want to give your scooter faster acceleration and up gears for more speed down hill but the gears won’t affect your speed on flat land. 49 mph is good if you ask me. It’s not worth all the money to go a little faster down hill lol but it is more fun flying down back roads at 55 on this little scooter

[@BassetCat1]

You can get the Variator Kit and sliding weights at the G6Y Store at EBAY Motors. He’s a good guy, and Honest. Who ships as soon as 𝖯𝖺𝗒𝖯𝖺𝖨 clears your $$$$. By😎🇺🇸

[@BassetCat1]

If you’ll buy a Dr. Pulley Jog50cc 2T Variator Kit and open the hole in its Gear Plate, to fit the Outside Diameter your engine’s crankshaft. Then run 6gr Dr Pulley Sliding Weights. Your engine will run 1,000 rpms slower, with everything else staying the same! My 66cc Yamaha Scooter runs 52mph @ 8,600 rpms nowhere near the 9,100rpm limiter! Gabe 😎🇺🇸💕

[@dwightclarkjr1609]

Need to abismo power tuner

[@geraldscott4302]

There is no point in trying to tune a small 4 stroke. It's hopeless. You can't gold plate a turd. It's a boat anchor and always will be. Either get a 2 stroke Zuma, or a Genuine Roughhouse. Both have Minarelli engines and there are a lot of things you can do to get them above 50 mph and much better acceleration, plus give them a wonderful sound.

[@jeffmacey6482]

Absolutely! I have 2016 Yamaha Zuma 50 fx. I'm leaving at stock because it's reliable. Last year purchased a 2021 genuine rough House does 48 mph stock. That's fast anough for me.

[@WetnwildhjReturns]

I wanted to see what this scooter could do with the best performance parts. The goal wasn’t to make it go 70. I know that will never happen. I have a zuma 125 and a Honda Forza 300 so I take those for rides if I want more speed and power

[@Nick-ev9kn]

What year is your Zuma?

[@WetnwildhjReturns]

Nick it’s a 2015 model. All 2012 models and up have the same engine

[@Nick-ev9kn]

@@WetnwildhjReturns thank you for the response, where did you buy the bbk for your Zuma?

[@WetnwildhjReturns]

Nick scooter swap shop.com but I bought the last one. That’s why it was only $249 and as far as I know they removed it from their website altogether

[@Nick-ev9kn]

@@WetnwildhjReturns damn... well hopefully another one pops up for me eventually... Haha

[@WetnwildhjReturns]

Nick I don’t think they’ll be restocking them. If I had another Zuma 50F then I’d buy a 75cc kit by SSP-G for $430 on eBay and a fuel tuner and try that set up

[@shannon9487]

Seems like you have not tuned the machine correctly. Installing a BBK kit without an aftermarket exhaust? Really!?! Sounds like your variator and secondary also need a tune-up

[@WetnwildhjReturns]

Shannon It has an NR Magic exhaust on it and it would overheat the engine every time I drove it for only like 5 minutes or 2 miles. Tried to tune the fuel to it with different amounts and it didn’t care. Switched back to stock and she cruses at 48-51 on flat just fine. Top speed is 58-59 down hills

[@anaickaube17]

Do not move around that restriction washer throw it out youll blow out a belt and lose speed

[@WetnwildhjReturns]

Anaïck Morin turns out it’s not in there at all. I took my Variator apart to install 6.5g rollers and didn’t see it.

[@davidthomsen7876]

You fucking idiot

[@deaths_comedians2847]

Should have got the t2 for speed it’s cheeper lol

[@WetnwildhjReturns]

Deaths_Comedian's T2?

[@JetSkiBuyFixPlaySellChannel]

@@WetnwildhjReturns 2 stroke.

[@115manutd]

PUT THE STOCK GEARS BACK IN THEN ULL GET MORE TOP END

[@WetnwildhjReturns]

field summers no I’ll get less. My buddy has the stock gears in his with a big bore kit and he maxes out at 47 mph and can’t go beyond that. Hits the rev limiter. And we both have the same scooter 2015 models

[@115manutd]

@@WetnwildhjReturns ok then try different roller weights urs r either to LIGHT or too HEAVY also u can try the 1000 rpm Torque spring since its pulling the race gears

[@WetnwildhjReturns]

field summers read my description in the video info. I have a brand new 1000 rpm torque spring and yeah my weights are 6.9g. It’s what came with the Variator. I’ll be getting 5g slider weights next

[@115manutd]

@@WetnwildhjReturns Richen the air mix screw to match the extra air coming from the polini filter the polini variator revs high so keep trying weights mite need to go heavier like 8 to 8.5

[@heytodd53074]

summers it's fuel injected......no mix screw

[@armanusa986]

it doesnt worth for that kind of money, just go to 72 cc and 50+ guaranty, i will like video for your time but not really right info for viewer

[@WetnwildhjReturns]

I have a Honda Forza 300 lol. This is just a way to cheat and say I’m riding a 50cc scooter when it’s really more. I like testing and modding small scooters

[@velogamestv9440]

My stock aerox goes faster

[@WetnwildhjReturns]

VeloGamesTv Good for you! Your scooter is also a 2 stroke which are known to be faster than all 4 stroke 50cc scooters

[@heytodd53074]

Duhhhhh it's a 2 stroke goofball

[@greatmindof1201]

It needs a pipe

[@mirsivaikas1947]

Its funny that my chinese scooter does 50 stock xd

[@WetnwildhjReturns]

Mirsi Vaikas I’m sure your speedometer is like 10 mph off. I’ve never seen a stock 50cc scooter go 50 mph unless it’s really a 150cc. I’ve owned Chinese 50s and they are slow in stock form

[@tdot1269]

If it's a 50cc/139qmb engine, your not doing more than 30-35 max. Even if it's a 2 stroke 50cc/1E40qmb it's not doing more than 40 stock

[@Tomijus]

Mine does 65 kmh