Why Did My Performance CVT Kit Make My GY6 50cc 139QMB Maddog Scooter Slower? How To Fix It. 

I have a 150cc scooter. I did a variator and clutch and gear up upgrade that absolutely killed the top end. The gear up was massive. So I did a smaller gear up. Went back to the stock CVT setup and just added a Nibbi 26mm carb. End result? Almost another 4mph faster. Now it's just the fine tuning to get to go even faster. I love your channel! Oh! BTW...I did the Ghetto Wrench electric fuel pump mod...all it did was leak gas. LOL!😂 It's okay. I went back to the stock pump, and it runs great. Why can't we just leave things alone? 😂😂😂

I have the Glixal 50mm(82cc) BBK, along with the Glixal Clutch system that came with Red torque and Red Clutch springs..The variator I got is the same size as my stock variator only it has a higher center..With this setup installed I shredded the Gates 669-18.1-30 belt, so I went back to the stock variator 7 grams slider weights..Well my belt is holding up but damn is that CvT casing hot..lol..I am only getting 42-45 mph..My belt is riding all the way to the end of my variator pulley,so I am thinking of increasing my variator size and a longer belt, but not to sure what size I should increase it all to..my goal is 55 mph..anyone have any suggestions?

Once you get the case cut 69mm piston head gear's 28HP/ 30HP SHIT OFF A SHOVEL FAST running 12000 RPM top end cruise at 6000 30/45 MPH

you need to try green mallosi torq spring that i sthe best wone for 50/80ccm gy6

I have been doing cvt tuning. This is a video i haven't seen yet. Holy hell this is hilarious!

Gy6 150s usually idle around 800rpms, the cvt engages at about 1000 or so, and tgey rev to about 9k, maybe 7. They make around 8-9hp. Most of these kits are goinh to suck up all that and you're gonna be damn near at the limit by the time you hit 15mph or so. Mind you the 50s make 3-5hp. When I had my Quantum, what I wanted was the clutch to engage faster, and the whole unit to shift slower or the same. Ultimately, if you want to go fast, then you need to change the final drive. All these cvt things are going to just get you to your top speed faster, or cost you top speed.

Would it be possible for you to get 4 valve head and cam piston it should fly past 50mph

I have a 150cc with original variator 13grams, and top speed 118km/h

1:54 that's a variator restrictor you see them on kymco's often

Ps and a small rad

Polini Variators are heavier then there’s supposed to be

It's a shame there not 2 stroke lot more easily done for more speed

I have an 80cc big bore kit on my peace sports scooter. It also has a pod filter, straight pipe exhaust and a size 90 main jet in the carb. Would I have enough power to use the Polini 95mm Variator?

not really CVT related, but anyway... i once had a gig pulling billboards with vespa 150s... we had one job, was a week long job, bit of a road trip. not the sort of trip you wanna take on a scooter, let alone pulling trailers! client didnt want to hire a truck... nice little caravan park. about the only good bit. whole week was just a litany of disasters, ended up with a flat rear tyre on the second day... not just a puncture, but absolutely shredded 3 inch gash... in a non scooter area... on a weekend... with no other transport... somehow ended up with a wheelbarrow tyre. all that i could find. 3 inch or 4 inch? i took the four. thinking its closest to 120 profile... na. should have taken the 3 inch. the final diameter of the tyre was enough so fully inflated, would rub on the mudguards. changed the gearing so it could barely crack 80KM.with my scrawny butt on board only... normally it could manage 110 with me and a trailer... 65, 70 MPH? (WTF!?) was a long and slow ride home, i can tell you, with the tyre half deflated... running no tube, despite being a tube-type... the bead seated?

Messed with that long ago and ended up reinstalling the stock parts. With my modified engine it makes more power and gets it up to speed faster but I think the limiting factor is actually the gearing. Have to figure out what I can utilize to actually achieve a higher top speed. A stock engine with identical gearing can get to the same speed but takes longer to do so.

Time got a 50mm piston?

Why don't you try and mix the weights thinking of what you was saying about RPM AND MPH you could find that's the sweet spot nippy cruising then brilliant top end pushing 1100RPM AT TOP don't forget the fuel side of it great video again Really enjoy watching you

Hey!! On mine I got the 90cc BBK and I did what u did with the different weights and clutch springs and it ended up blowing out belts I also have that blue high performance cdi box too so I ended up going back all stock on the clutch with 6g weights with the stock carb and I’m getting 45mph top speed I have a rolling wrench performance carb coming in this Saturday so hopefully it will give me way more throttle response even with the stock carburetor it doesn’t have any dead spots when I go wide open throttle.

Do you think this mod would work with the 150cc? 95 variator and 6.5g rollers with the new contra? Or should I go bigger on the rollers, I'm going for an even balance of off the line and a decent top speed. Say 65 with the 171 BBK.

My goal isn’t too speed, what RPM should I be shooting for? I’m around 8k now.

My spring combo is big spring (torque) Yellow 1500 rpm small springs (clutch) Red 3000 rpm

hello, do you know how i can tune my scooter with a gy6 and the newest injektion technology? Its a peugeot kisbee

I put an 842-20-30 belt on with a 115mm variator inner since the face is already 115. The new belt appears to be just slightly wider than the older 835, im guessing due to wear. It is far less quick with the 842 belt. The new belt doesn't sit all the way down into the variator and doesn't go all the way to the outside of the rear clutch pulley. This causes it to feel as if its starting out in a higher gear and not in first gear so to speak. The old belt is in good condition and simply appears worn slightly making it look less wide than the new one. Is this normal? Does a new belt have to break in to be able to sit all the way down into the variator?

Amazing Job on explaining everything. Giving away all the tuning secrets 😂😂

We've seen your cvt tuning, now its time for carb tuning! Wideband time!

These videos have been a god send. I would be lost on most of the stuff i have tried without these types of videos

Usually the contras spring just kills it always just used the stock one

I bet you could really sell a wiring kit . Put one together to fit maddog 50 . I'll buy it

I just want my 139qmb to do 50-55

I have been going through just this lol. Installed the taida bbk 171cc and can't get the belt to travel up the variator. I had 10g rollers in and it was screaming doing 68.

Not related to this video but what shock are you running?

Patiently waiting for you to do that bbk.