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 2015 Zuma 50F Polini Big Bore Kit build project 
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Scooterologist

Joined: Sun May 27, 2018 11:18 pm
Posts: 65
Location: Massachusetts
scooters and mods: 2013 Honda PCX 150 (RIP), 2015 Yamaha Zuma 50F, 2014 Honda Forza 300
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
pat-daddy wrote:
Glad you figured out that mystery. Impressive performance. I recall the sT polini 70cc bbk was generally considered to be mostly rubbish.

sTs? Do you mean the 4Ts (4 stroke) BBK? I got the Polini one because I heard good things about it and it’s the most simple one to install (not needing to install a fuel tuner or any wiring)
So far it’s been great but I’ve only ridden it for 15 minutes since I got it all fixed up. I plan on driving it for a couple hours tomorrow. I wanna break her in fast.

_________________
2015 Titan Grey Yamaha Zuma 50F w/ dual headlight mod, restrictor washer removed from variator, Michelin Bopper 130/90-10 front and rear tires, Polini 66cc BBK, Beast Mode Fuel Tuner, Polini Air Filter, Polini Variator, 6.25g Rollers, Malossi 13/44 Gears, Malossi White Contra Spring, Koso 1000 RPM Clutch Springs
2013 Red Honda PCX 150 - Stock (Crashed into a deer August 2018 :( RIP)
2014 Red Honda Forza 300 - Stock


Fri Mar 29, 2019 6:35 pm
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Posts: 736
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
Burukkusu wrote:
pat-daddy wrote:
Glad you figured out that mystery. Impressive performance. I recall the sT polini 70cc bbk was generally considered to be mostly rubbish.

sTs? Do you mean the 4Ts (4 stroke) BBK? I got the Polini one because I heard good things about it and it’s the most simple one to install (not needing to install a fuel tuner or any wiring)
So far it’s been great but I’ve only ridden it for 15 minutes since I got it all fixed up. I plan on driving it for a couple hours tomorrow. I wanna break her in fast.


Typo, I meant the old 2T versions.

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Stock '05 Zuma - in the wild somewhere.
2015 Zuma - Stock. For now.


Sun Mar 31, 2019 10:05 am
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Scooterologist

Joined: Sun May 27, 2018 11:18 pm
Posts: 65
Location: Massachusetts
scooters and mods: 2013 Honda PCX 150 (RIP), 2015 Yamaha Zuma 50F, 2014 Honda Forza 300
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
UPDATE:
So as I was driving the Zuma today I was going up a hill and suddenly it lost all acceleration and just died on me. When I started it back up and gave it gas it died again. So I was like “oh great what’s wrong with it now” and called my mechanic to pick me up. 10 minutes later I read some posts online to see how other people got it to run again or what was wrong and a guy posted “did you check the gas to see if you’re out?” Doh! I’m an idiot! :doh: Didn’t even think to look cuz I put $2 in about 90 miles ago. I called my mechanic and let him know it could just be out of gas. There was a small puddle of gas in the tank when I checked but I guess that little amount doesn’t reach the fuel line. They brought me gas, low and behold she started right up. Boy did I feel stupid :awesome:
But anyway I’ve put about 120 miles on her since the new kit has been install. Gonna do about 30 more before I change the oil and then drive it like I stole it lol. Also will be adding 5.5g sliders and new 1000 contra spring as well and clutch springs

_________________
2015 Titan Grey Yamaha Zuma 50F w/ dual headlight mod, restrictor washer removed from variator, Michelin Bopper 130/90-10 front and rear tires, Polini 66cc BBK, Beast Mode Fuel Tuner, Polini Air Filter, Polini Variator, 6.25g Rollers, Malossi 13/44 Gears, Malossi White Contra Spring, Koso 1000 RPM Clutch Springs
2013 Red Honda PCX 150 - Stock (Crashed into a deer August 2018 :( RIP)
2014 Red Honda Forza 300 - Stock


Sun Apr 07, 2019 6:46 pm
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Scooterologist

Joined: Sun May 27, 2018 11:18 pm
Posts: 65
Location: Massachusetts
scooters and mods: 2013 Honda PCX 150 (RIP), 2015 Yamaha Zuma 50F, 2014 Honda Forza 300
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
Here’s a video of my progress. Before and after the big bore kit:
https://youtu.be/6-RxK0B7cqQ

And here’s a shortened version of the same video with a side by side comparison of before and after:
https://youtu.be/ampa194MAls

_________________
2015 Titan Grey Yamaha Zuma 50F w/ dual headlight mod, restrictor washer removed from variator, Michelin Bopper 130/90-10 front and rear tires, Polini 66cc BBK, Beast Mode Fuel Tuner, Polini Air Filter, Polini Variator, 6.25g Rollers, Malossi 13/44 Gears, Malossi White Contra Spring, Koso 1000 RPM Clutch Springs
2013 Red Honda PCX 150 - Stock (Crashed into a deer August 2018 :( RIP)
2014 Red Honda Forza 300 - Stock


Sun Apr 14, 2019 2:14 pm
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Joined: Fri Aug 31, 2018 5:18 pm
Posts: 489
Location: Fox Valley Wisconsin
scooters and mods: 2 2004 Vinos 2004 Zuma
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
Nice work
That is quite a bit of new parts to try coordinate working together .
Your not hitting the rev limiter going down hill at 52-53 so your up gears are helping .
Theoretically with the gears you should not hit the limiter till mid to upper 50's.
You probably pick up some performance by dialing in the transmission.
Are you getting full belt travel when you are wide open throttle
The way to check

Use a permanant marker on the variator and make a few test runs with various weights and make notes for each weight combo and how much marker as rubbed off.

If you have a set of weights that you can experiment with and then buy the slider weight that is up to 1 gram higher than the roller weight that worked best.

enjoy the modding

_________________
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 (sold)


Sun Apr 14, 2019 4:53 pm
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Scooterologist

Joined: Sun May 27, 2018 11:18 pm
Posts: 65
Location: Massachusetts
scooters and mods: 2013 Honda PCX 150 (RIP), 2015 Yamaha Zuma 50F, 2014 Honda Forza 300
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
Here’s a pic of my downhill speed. It was a pretty long downhill but I never hit the Rev Limiter


Attachments:
60C1230C-E72A-4829-8D0B-15DCD5B0D1C8.jpeg
60C1230C-E72A-4829-8D0B-15DCD5B0D1C8.jpeg [ 309.58 KiB | Viewed 231 times ]

_________________
2015 Titan Grey Yamaha Zuma 50F w/ dual headlight mod, restrictor washer removed from variator, Michelin Bopper 130/90-10 front and rear tires, Polini 66cc BBK, Beast Mode Fuel Tuner, Polini Air Filter, Polini Variator, 6.25g Rollers, Malossi 13/44 Gears, Malossi White Contra Spring, Koso 1000 RPM Clutch Springs
2013 Red Honda PCX 150 - Stock (Crashed into a deer August 2018 :( RIP)
2014 Red Honda Forza 300 - Stock
Sun Apr 14, 2019 5:52 pm
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Scooterologist

Joined: Sun May 27, 2018 11:18 pm
Posts: 65
Location: Massachusetts
scooters and mods: 2013 Honda PCX 150 (RIP), 2015 Yamaha Zuma 50F, 2014 Honda Forza 300
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
It’s been awhile since I made an updat but I figured it’s time now that I’m all done adding to this scooter. Just put on Michelin Booper 130/90-10 on front and rear, also adding the rollingwrenchdenver.com fuel controller as well as 6.5g rollers. I tried 5g sliders and they just didn’t feel good. There was this weird delay when I gave it throttle and I made sure to install them correctly. Next I tried 8g sliders and thought they felt better but my speed was slightly reduced on flat and considerably down hill. Before I could go 54.4 mph down hill with 6.9g rollers and now I went 52.9 and hit the rev limiter. I removed the 8g sliders and put 6.5g rollers in. I’m done with sliders lol waste of time and money. I’m still averaging 45-47 on flat with occasional 50 if it’s a flat that turns into a very gradual down grade (this is all gps speed as seen by using my cell phone) the scooter speedometer is 2 mph off.
Well anyhow I now can go almost 57 mph down hill! But that’s all. I hit the rev limiter at 56.9 MPH GPS confirmed.
I realize this thing will never go 50 on flat so my battle ends here. Time for me to get a Zuma125 and big bore that next :awesome:


Attachments:
B2F786C4-7B85-445E-B5DD-60A048059B97.jpeg
B2F786C4-7B85-445E-B5DD-60A048059B97.jpeg [ 761.4 KiB | Viewed 137 times ]

_________________
2015 Titan Grey Yamaha Zuma 50F w/ dual headlight mod, restrictor washer removed from variator, Michelin Bopper 130/90-10 front and rear tires, Polini 66cc BBK, Beast Mode Fuel Tuner, Polini Air Filter, Polini Variator, 6.25g Rollers, Malossi 13/44 Gears, Malossi White Contra Spring, Koso 1000 RPM Clutch Springs
2013 Red Honda PCX 150 - Stock (Crashed into a deer August 2018 :( RIP)
2014 Red Honda Forza 300 - Stock
Fri Jun 28, 2019 8:46 pm
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Bronze Member
Bronze Member

Joined: Fri Aug 31, 2018 5:18 pm
Posts: 489
Location: Fox Valley Wisconsin
scooters and mods: 2 2004 Vinos 2004 Zuma
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
Nice work you gave her every mod you could .
So when you hear us 2 stroke guys tell the 4 stroke guys if you want to go 50 mph buy a bigger scoot we are being truthful.
Those 125's stock do 55 and modded out 70 mph .
So you built this for your girlfriend now its your turn .

_________________
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 (sold)


Sat Jun 29, 2019 5:52 am
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Scooterologist

Joined: Sun May 27, 2018 11:18 pm
Posts: 65
Location: Massachusetts
scooters and mods: 2013 Honda PCX 150 (RIP), 2015 Yamaha Zuma 50F, 2014 Honda Forza 300
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
So I was messing around with my fuel tuner and decided to give my Zuma an extra 24-26% more fuel through all the RPMs. I filled my tank and went on a 56 mile round trip. Filled my tank when I got back and put 0.75 gallons in. I did the math and realized I’m only getting about 75 MPG which to me is terrible. My Honda Forza gets 74.5 MPG and is way faster lol so I decided to retune the fuel to 10% throughout the RPMs and it’s slightly slower when it comes to take off and takes a few more seconds to get up to full speed but I can live with that. Now I should be getting about 90-95 MPG which I’m happy with. I know I gave up on sliders too but I bought some 6.5g one for $9 just to try out. I’ll give them one last shot and let you guys know if it gives me any extra performance gains.

_________________
2015 Titan Grey Yamaha Zuma 50F w/ dual headlight mod, restrictor washer removed from variator, Michelin Bopper 130/90-10 front and rear tires, Polini 66cc BBK, Beast Mode Fuel Tuner, Polini Air Filter, Polini Variator, 6.25g Rollers, Malossi 13/44 Gears, Malossi White Contra Spring, Koso 1000 RPM Clutch Springs
2013 Red Honda PCX 150 - Stock (Crashed into a deer August 2018 :( RIP)
2014 Red Honda Forza 300 - Stock


Sun Jun 30, 2019 7:53 pm
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Newb
Newb

Joined: Sun Mar 27, 2016 9:36 am
Posts: 16
Location: Nashville, TN/ Boynton Beach, FL
scooters and mods: 2014 Yamaha Zuma,Polini,16/51,prodigy,51mph, 09 Zuma Athena 70cc wild lion pipe, 15/50 up gear 54 mph.
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
Any more results on the 66cc kit? I have the same BBK using prodigy variator with 4.5gm weights. Polini up gears. I was getting 50mph gps I changed rear tire to Michelin bopper 120/90 and it is geared too tall will only pull about 7400 rpm and top speed about 46/47 mph gps on flat ground .


Fri Jul 05, 2019 12:06 pm
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Scooterologist

Joined: Sun May 27, 2018 11:18 pm
Posts: 65
Location: Massachusetts
scooters and mods: 2013 Honda PCX 150 (RIP), 2015 Yamaha Zuma 50F, 2014 Honda Forza 300
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
beentherer wrote:
Any more results on the 66cc kit? I have the same BBK using prodigy variator with 4.5gm weights. Polini up gears. I was getting 50mph gps I changed rear tire to Michelin bopper 120/90 and it is geared too tall will only pull about 7400 rpm and top speed about 46/47 mph gps on flat ground .

Yes I have done some more tuning and today turned out great. I have 130 boppers on mine and didn’t notice any gain in speed BUT I’ve been fooling around with Roller weights. Don’t bother with sliders. They shifted weird on take off and I could never get passed a 52.9 MPH GPS speed.
Today I put Three 6 gram and Three 6.5 gram rollers in my polini Variator (spaced 6, 6.5, 6, 6.5 etc.) for a total of 37.5 grams and I hit almost 60 down hill! I think this is the best it can do. Also I never get passed 48 on flat unless I’m coming from a down hill, then I can do about 50-52 for awhile.


Attachments:
DD33EB9F-B6F9-49CA-986E-2F1C2C0F63A5.jpeg
DD33EB9F-B6F9-49CA-986E-2F1C2C0F63A5.jpeg [ 715.9 KiB | Viewed 90 times ]

_________________
2015 Titan Grey Yamaha Zuma 50F w/ dual headlight mod, restrictor washer removed from variator, Michelin Bopper 130/90-10 front and rear tires, Polini 66cc BBK, Beast Mode Fuel Tuner, Polini Air Filter, Polini Variator, 6.25g Rollers, Malossi 13/44 Gears, Malossi White Contra Spring, Koso 1000 RPM Clutch Springs
2013 Red Honda PCX 150 - Stock (Crashed into a deer August 2018 :( RIP)
2014 Red Honda Forza 300 - Stock
Tue Jul 09, 2019 5:38 pm
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Scooterologist

Joined: Sun May 27, 2018 11:18 pm
Posts: 65
Location: Massachusetts
scooters and mods: 2013 Honda PCX 150 (RIP), 2015 Yamaha Zuma 50F, 2014 Honda Forza 300
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
beentherer wrote:
Any more results on the 66cc kit? I have the same BBK using prodigy variator with 4.5gm weights. Polini up gears. I was getting 50mph gps I changed rear tire to Michelin bopper 120/90 and it is geared too tall will only pull about 7400 rpm and top speed about 46/47 mph gps on flat ground .

Were you getting 50 mph gps on flat ground or downhill? And which polini Up Gears? The 13/44 or 16/51? How many miles on your BBk? I have just about 1,000 miles on mine

_________________
2015 Titan Grey Yamaha Zuma 50F w/ dual headlight mod, restrictor washer removed from variator, Michelin Bopper 130/90-10 front and rear tires, Polini 66cc BBK, Beast Mode Fuel Tuner, Polini Air Filter, Polini Variator, 6.25g Rollers, Malossi 13/44 Gears, Malossi White Contra Spring, Koso 1000 RPM Clutch Springs
2013 Red Honda PCX 150 - Stock (Crashed into a deer August 2018 :( RIP)
2014 Red Honda Forza 300 - Stock


Tue Jul 09, 2019 5:48 pm
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Joined: Wed Mar 16, 2011 9:25 pm
Posts: 736
Post Re: 2015 Zuma 50F Polini Big Bore Kit build project
beentherer wrote:
Any more results on the 66cc kit? I have the same BBK using prodigy variator with 4.5gm weights. Polini up gears. I was getting 50mph gps I changed rear tire to Michelin bopper 120/90 and it is geared too tall will only pull about 7400 rpm and top speed about 46/47 mph gps on flat ground .


Doesn't make sense that this would be due to the tire change. Perhaps something else was messed up in the process of removing and reinstalling the rear wheel.

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Stock '05 Zuma - in the wild somewhere.
2015 Zuma - Stock. For now.


Mon Jul 15, 2019 4:11 pm
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