50cc gy6 scooter Big bore kit install and test

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Today we do a 50cc gy6 scooter Big bore kit install and test. We got this kit from amazon and we are 95% happy with it so far! Time will tell what this kit can handle. We are excited to finally install this big bore kit and start the next level of upgrades to this qmb139 scooter. We will have to re tune everything to squeeze out all this kit has to offer.

DISCLAMER I am an Amazon affiliate and may make commissions on the products linked here.

PART LINKS

FOR 15OCC GY6
variator weights link

cdi box link
NOTE: this cdi box only worked on our 150cc gy6 scooter.

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FOR 50CC GY6

BIG BORE KIT LINK

CARB (this is a stock carb!)

20mm MEDIUM PERFORMANCE CARB! (for BBK, still works with stock setup)

variator kit

PERFORMANCE VARIATOR KIT (THE BEST YOU CAN GET)

Variator weights (5s were too light... get7, 8 or 9 grams)

50cc GY6 belt

BEST PERFORMANCE CARB !!! ( YOU WILL NEED THE THROTTLE CABLE AND INTAKE MANIFOLD, AND AIR FILTER LISTED BELOW TO FIT THIS CARB)

THROTTLE CABLE FOR PERFORMANCE CARB

INTAKE MANIFOLD FOR PERFORMANCE CARB

AIR FILTER FOR PERFORMANCE CARB

GEAR WE USE

MAIN CAMERA
SECOND CAMERA
ACTION CAMERA
ACTION CAMERA MOUNT
CAMERA MIC
CAMERA BAG
DRONE

DISCLAMER I am an Amazon affiliate and may make commissions on the products linked here.

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[throttle_therapy]

Any suggestions for a new exhaust set up??

[mrpartridge]

I just installed the glixal 52mm 90cc big bore with a naraku big valve head on my taotao thunder. It buried the speedometer to 45mph in just a few seconds and even held that speed up a hill. Stock carb with a 91 main jet and stock cvt. The power is insane and it hasn't even been tuned yet. If you want more power go for the 90cc. You won't regret it. Good luck guys I'm looking forward to more content.

[soulwarrior]

Guess ill have to do mine.. ive already put a Racing clutch, New rear drive gear, New ECM with rev limiter disabled and a Coil pack from a 150cc.. And i can get about 45mpg on flat ground, And 55+ with the wind at my back.. And im still 49cc.. Might have to use more synthetic oils if i put the 80cc kit on.. But i think you inspired me to do it and record it..

[fthrgasp]

oh this is great timing. i just changed my carb this afternoon and i was considering a bbk as well. you guys are an inspiration (i'm not sure my better half would see that as a good thing, but i love it)

[MrZap]

I stopped using exhaust studs. On the qmb hex heads with M6x1.0x20mm in length with blue loctite does just fine

[alistairrobinson]

in 1998 I got a brand new yamaha Aerox 50 2 stroke, changed the rollers and removed restrictors from exhaust, otherwise stock = 55mph, felt epic, I was 16.

[heldermsl]

Dude, I got a 2008 yamaha JOG R 50cc. Only thing done to it was removing the spacer off of the variator. It does 49 mph

[theoneandonly]

I actually did a big bore kit today aswell! The timing!

[Billby]

Put a motorcycle carburetor and motorcycle coil and put highest recommended tire pressure and you can add 5 mph. I have done a few upgrades.

[johnkatakowsi]

Want more top end change the rear end gear ratio comes 13/1stock! i put in a 10/1 gear my top end is 50mph i weight 230lbs. plus i did the big bore kit and carb and cam!

[violetstill]

I know this video is a bit old already, but a BBK wont always raise your top speed. You might get a few but the increase is negligible. The increase in power is due to the increase in torque so it’ll get you to the powerband or to top speed a lot faster.

[scootertuningfl]

that old setup wasnt stock looks good man i love your videos im building my gy6 too

[vamountainman]

BBK can be done in an hour no problem but taking your time and being thorough is well worth an extra hour if your not doing this on a daily basis.

[christossakelariou]

Bikes running rich. The deep sound gives it away. Go down a size in jets for more power

[garnetbradshaw]

Been watching for while now.
Picked up what I thought was a stock Chinese 50cc scooter. Exhaust was messed when I bought it for good price. Was loud and ran good.
Then it went up to 9000 rpm and did 60klm quite easy. Belt frade up and shut me down. Replaced it with new 729mm kevlar belt and cleaned everything in case up. No scale so roller weights unknown.
With new belt it had same speed but now it only hit 6500 when full throttle and doing 66klm. Top speed down hill has been 73.
Have scale and have replaced clutch with performance one that had red springs. Not as fast anymore. Put stock springs from old clutch in and weight rollers. They were 5.6g each.
Here is my concern.
What size piston in it. Has a bbk been put on.
Anyway to tell without removing valves and head to measure piston.
Carb comes off this weekend to get cleaned and rebuilt.
Dont want to buy new 80 or 100cc bbk if it has one in already.
The rollers are not stock weight so that got me thinkn

[crick]

about to install mine this weekend, doing 40-42 mph right now on straight and level, hoping for a big boost with those extra 30 ccs

[petermclaughlin]

What's really fun is standing on the floorboard down hill and leaning and turning no hands

[joshsutcliffe]

Best variator weights for 250 pound dude. Got a 50cc agility with a "100" cc big bore kit coming

[sdvid]

Thanks for the video but I feel cheated. I was really hoping to see how you fit the piston in the cylinder. Did you use a ring compressor?

[StefGaming]

You already had a stock 65cc engine. Im a moped mechanic here in the Netherlands and the size of the stock gy6 piston here is 39mm. Of course the Laws here are diffrent, as we can only drive 25km/u (15.5 mph) without a helmet and 45km/u (28mph) with a helmet. I dont know How the laws are in your state. But i think you can drive faster there ;)