GY6 BIG BORE KITS - EVERYTHING YOU NEED TO KNOW 

i love working on small engines. dirt bikes 2 and 4 stroke. when i was a kid i started out on Briggs. now there is aftermarket for everything. back in the day there was a lot of swoppin and moddin. thanks for the vid

What a great and well explained video. Thank you very much! I have a 61 mm Taida cylinder and forged (I assume 4032 type?) domed high compression piston in my GY6. It was also a drop in kit as cylinder liner is thin enough. I have a NCY big valve cylinder head with 27,8 mm intake valve and 23 mm exhaust valve. The cylinder head is at the moment at my cylinder head porting guy who cut better multi angle valve seats and will port it. As the short side of the intake port is always too sharp turning towards valve seat in these GY6 heads we first planned to raise the intake port and put some epoxy on the intake port floor to get a better shape smoother turning intake port towards the intake valve seat. Plan was to port more from the intake port roof. Then we measured the material thickess from intake port roof where it’s thinnest to intake valve spring ”pocket” or ”base”. Material thickness doesn’t allow us to make this modification so the porting will be done less ”radically”. There is still a lot of room for improvement. I can see that in this cylinder head you have there is a better exhaust port flange as there is not that extra cutted ring shape groove for that type of exhaust gasket. I use that same type exhaust gasket as there is in your kit. We could maybe buy one of your two valve GY6 head and see if it has more material to do the required mods. I have 30 mm PWK slide carb, NCY ported intake manifold, A9 cam and Turbo Kit exhaust with better modified and flowing noise killer.

Holy cow the level of service you give to your customers is unreal, when I switch my 155 to a 171 ill definitely be buying the ProBld. Those exhaust studs and preinstalled pistons seem like a dream!

Thanks for a simplified explanation for the average joe, looking forward to 50cc explanation. 😊💪👊

I still not have my moped but soon, learning alot from you, Thank you Sir 💪🏼

DUDE your carb video was the SHIT!! I've watched it 3times now and feel so comfortable now working on my carb later today.. ill defiantly subscribe . THANKS

Wow Matt one of the more informative videos I think I've seen from you that was top-notch man really enjoyed that✌️ from Florida

Wow man you possibly just saved me money, I was about to just go buy one thank god I found this video thanks,

I'm a 70 year old retired long distant truck driver so the first 3 years started in 2013 I started a small Business selling security camera setups done pretty good with only using word of mouth. I decided to sell my house down in Dade city fl and moved up into the country in Obrien Fl. and its a lot different then city life so I just decided to buy and fix up scooters from 49c threw 250cc mine will be the Roketa 250cc b54 . Anyway I'm very impressed with your program and most likely start getting some big bore kits from your company . Your very intelligent mechanic on scooters. Such a very way you represent your self I don't see why any one that has a heart to be there own mechanic Your very understandable. Your a very good teacher and love your work. Just saying I watch your show's a lot and plan on joining your Fan land because you deserve it. will join 4/3/2023. Thanks

Just thank you for sharing all your information so clearly in all your videos I’d love to come be your shop cleaner just to soak in your knowledge man your great thank you

I DID 3 FREAKING SPINNING BACKFLIPS JUST BECUZ ..GREAT VID LIKE ALWAYS..THANK U

Great information about the piston differences thank you

Dude that's freaking sweet. I got a Genuine Buddy scooter,with a 150 cc engine. It's a 2009 model. I would definitely love to install your drop in kit. Give her more 😂 nice video. You remind me of my shop teacher in high school . You explain everything like he did .I've always enjoyed learning these things thank you for explaining everything. I can't wait to start doing it this summer. Keep up the excellent work. You tell it like it is. Lets build a drag scooter lol😂

Can't wait the Video of explanation to Install NOS or TURBOCHARGER. Keep it up a Good work. Your Videos are Great👍

awesome modifications on this engine! :)

Thanks! Been a big help

Thanks for the video pal!! You can learn alot from a gear head!!!🙂✌️🕊️

Cool video" nice breakdown , forged in billet just like in high-end race engines and v8s you want it to hold together especially if you're running big boost numbers you got to have it I can remember back in the day having a yz100 and they sold a 175cc top end kit" braaap" had a 80cc wheel set, so" it literally look like an 80 " the big bore maico"s burrrt" & a XT600 Enduro, ect

Thanks for the cast and forged explanation! I think I would go cast for fuel economy.

Some good info. Some flat out marketing

Wow unreal!!

Man i really loved motorcycle.. I wish you could race in thailandand do a documentary videos.. Lots of good mechanics there too..

Can you do a video on the 50cc for upgrades? Like big bore kits and carb. I’m new to your channel and i just got a maddog 50cc

Thank you for your showcase very explanatory you are the best doing a really good job you to explaining and learned a lot from you and I will be calling you to buy buying some parts for my scooter 150cc I want to go with the drop-in Big Bore Kit and the can and the Borg piston can't wait and then I'm going to be buying a performance clutch from you thank you so much keep up the good work Steve from Annapolis Maryland

Brilliant video would i need to change the injector and cdi for this to work ? I currently have a 2019 125cc 152qmi with EFI, Many thanks Keith 😊

When I upgrade and rebuild my gy6 im definitely getting the big bore and big valve kit just for the 8mm exhaust valve. I have had to replace and re tighten those studs and eventually had to tap it to 8mm just because it was a nightmare with how many times it broke

Hi new subbed here, just want a clarification you said on 7:38 with the dome (high comp) wil give you low end torque does that mean it will give you an aggressive acceleration? but poor top speed?

Alrighty. So what if I want a daily hard use one, but I still want decent performance? I'm assuming I just go for cast pistons at that point, but I'm not entirely sure. I want to do 171cc, and for my needs, I feel more drawn to the rolling wrench kit over the probuild. Are my concerns valid in that I should not do a forged piston? Also, in Alaska. Feel that might be important.

Nice!

Some info for anyone who has a real gy6 china ped... mine is a very rare 125cc Ariic, but model was released i think in 2018 there are older models, anyways mine is a short case 10" wheel (fuel injection) and yes a big bore 150cc kit works perfect so do it as no videos will show its possible but it is. Also i took the stock variator and filed the top of every ramp until thin and steep after smoothing the best i could i coated it with clear lacker faintly do not get it to drip spray, after dry i then added only 3 of the 12g rollers or 10g not sure, i play with it sometimes but oh its a beast. I also forgot to mention i added a rear performance clutch yes it looks like the stock but is only about £30 and is black with red springs and because it is 4 stroke i leave the black stock main clutch spring and im going to add a race cam with steeper ovals. Its a lovely beast of a machine and also stock exhaust and remove the air filter face cover it has a dedicated open filter srewed in under the air filter face plate dont remove that though if rains re attach the cover but first trim around the air access port on the filter face plate to enlargen it a lil. It rides almost like a 2 stroke or pit bike also a wheelie machine to say my bike is heavier than a vespa i think also engines are tanks i swear it never lets me down only other bits have so far unrelated to engine like kick stand, i reckomend replace most weak screws with British ect. Have a good day and i hope my info has inspired people to do it so much fun. Rid safe.

Hey! Big fan of your RU-vid channel. I've been scouring the internet and RU-vid for a full wiring harness for a couple GY6 QMJ157 Kodi/Mossimo buggies we have here at our Boys Ranch, Agriculture Equipment and Small Engine Repair training center. I can't seem to find ANY (complete) wiring harnesses that either come with properly labeled wires, or with English instructions. All of the GY6 buggies we have were donated to the Boys Ranch, but apparently the previous owners' kid did a hack job on the control boxes, and didn't reconnect everything. The control boxes and everything inside them are missing!! I've been looking for several months and I haven't seen ANYONE on RU-vid with a proper video on how to rewire a GY6 buggy, where they listed either a link where you could buy a complete harness, or a proper wiring diagram and/or pictures to see what wire color/connector shapes go to what. I've only seen one video that comes close which is several years old, but it's not a professionally done video like yours are, and it's just a young kid that never zooms the camera in close enough to see wire colors or connectors, never said where he got the harness, and no longer responds to comments where people have been asking over the last several years the same questions I have. Also, do you know of a place/link where you can get a GY6 QMJ157 case with Internal Reverse like most GY6 Kodi/Mossimo/Spyder buggies have? If you could record a video on that, I'd donate $100 through your website Tech Support link! On behalf of myself and many other viewers, THANK YOU IN ADVANCE!!!

Hi! Great video! The 171 big bore kit fits in the engine of a Honda ADV 150?

Hey Matt quick question!! Im about to place my order! What crank would I use with my gy6 171cc without boring the cases?? Thanks

Guys.. I recently aquired another 2stroke, awesome, exxtremely practical n simplified in looks, slim, has practicality as a farm helper even, if one so chooses,, im tallking about: YELLOW Piaggio Free 1998 (removed variator washer + 10 sizes bigger main-jret) that I had now in the winter already, its kickstart systen broke and was needing a new returning spring for for it but then I got ANOTHER one that was the same series, a RED Piaggio Free for a 100 bucks it only neede to be sucked out of gas wiich i did, removed the carb, cleasned it with brake clean n carb-clean after confirming a "beautiful" spark,. Now i wanna build some kind of light weight "big-bore" kit

I don't know about anybody else but I'm sold. My next project for sure.

Hello brother, thanks for the video, I have an x-pro 125cc, which cylinder do you recommend? Thank you.

I have a gy6 type A with a short case. Engine# 1p57f. I’m looking for a drop in kit for the top end. Don’t really need more horsepower. Just want to make sure I order the right parts. It has the 54mm stud spacing. The rings are shot! Just trying to get it back up and going again for the kids. What top end kit would you recommend without boring the crankcase? Any help would be much appreciated.

I have a 150cc Sym Fiddle 3 and I want to convert it to fuel injection. What can you advise me to do ? Which efi to use ? And would it be easy ? And thanks a lot. I love your videos. Keep it up !

Awesome products and excellent videos. Only problem is you seem to be sold out of all the stuff I wanted lol

How many times can you change your big bore kit? Because i don't know anything about fixing scooters but someone recommended i get a 80cc big bore kit. But it's not fast enough for me. So do i need to get another scooter or can i go higher on the big bore kit?

awe!

What size exhaust valves and or exhaust port does a 125cc have or a 172cc bigborekit? Im looking to make a custom exhaust for mine i have a 61mm bbk on it now but didnt realize to measure before, its already on my bike so now its out of reach to measure without taking engine of. Thanks

Hey I just bought an ATV with a 150 GY6 I need some information on pulling it out of the ATV and the removal of the engine from the transmission is there anything special I need to do upon removal and reinstall!! Been searching RU-vid I figured this would be the best yet!😊

Can you make a video explaining the little 125cc Chinese motorcycles engine/engines? The "YX140 Horizontal 4-stroke" and their big bore options? Maybe highlight the differences between those and the Honda Grom? That would be a MAJOR help. It's damn near impossible to get any accurate information on them. Thanks!

hey i have a question does 4valve cylinder head gy6 can give you more speed than 2valve cause i have a 175cc engine and 28mm carb but it only 110kph top speed what do you think about this? cause i planning to buy a 4valve cylinder head

Hi there, i just want to ask is the pgo trex 150cc 4t is the same as gy6.. thinking of ordering the big bore kit for my scooter

Automatically have oil pressure on cold start. Is that normal? I changed the oil and cleaned the screen and installed properly. ( Noticed that the exhaust out of the muffler is forceful and smells like very clean burn. Also it's cool exhaust air while idling.

QUESTION. GY6150CC ON KANDI SPIDER I CHANGED PISTON AND ROCKERS. THE ROCKERCAM, TIMING SPROCKET HAS A PIVOT TO THE LEFT SIDE AWAY FROM THE TIMING CHAIN. ( IS THEIR A SERTIAN POSITION ON THAT WHEN INSTATING?)

Now make a 225 kit for the TW200. 😍 Cast piston. Looking for about 20hp, good torque and long life. Please?

👍👍

I recently bought a 180cc big bore but the ring gap seems too tight on the cylinder wall? Whats the proper ring gap? Thanks

hello, can you make a video that explains the dimensions of the honda ruckus battery box garnet in detail?

Are there any quality(such as ur's) upgrade kits for GY6 48/50 cc?

I have a GY6 150cc and I put a new exhaust now is slow claming hill and low speed.what you recommend me to do i have the motor stock.Thank you from new Britain Connecticut

Can u do a video on how to replace the exhaust manifold on the engine because my exhaust stud broke off in the engine on oneside and the other hole is stripped so I just wanna replace the cylinder head

Hello sir, What could be causing some popping and bogging at 2/3 - 3/4 throttle on a 150cc GY6 scooter? Can you think of anything electrical that can be.causing this? I've already installed 3 new carburetors, 3 different csi boxes, different coil wires, and a couple other things and I can't seem to get rid of it. Would a bad stator or rectifier be the cause? Can you help me please? I am really just so frustrated right now. Thanks so much for any advice you could offer.

Hi, I have a Kymco VJR 110cc 4vlaves and I would like to upgrade the engine to 125 or 150cc. kindly advise on what I should do or need. thank you.

I want to keep my 125cc volume, is there options for the GY6 to add more power to it before adding a turbo?

If I install a big bore kit on my scooter Do I need to replace the crankshaft ? The scooter is a suzuki 125cc 152QMI engine with 26000 kms ( 16000 miles) im thinking upgrade it to 150cc

What is the difference in longevity between the forged and cast pistons?

I have a Chinese adult scooter that I bought two years ago it's called a capri or Saber 200cc EFI. Can you tell me what size of rear clutch pulley I should order? And it's a long case.

This kit is suitable for a Yamaha Fino 110cc? Or a Honda Dio 110cc? I mean, this engines has the same architecture of the GY6 engine you sale kits for?

I have 72cc kit can you do some videos about that i only find these +100cc videos and wich is better long case or short case does the power chance at all in them

I have a Linhai 260. Scooter are there any videos on how to do a cylinder replacement or a bore kit

How are the 232s on daily driving? I wouldn't mind some additional maintenance but still want reliability for longer trips

hello,im not sure if i have a gy6..it looks just like what your showing..Yamaha Nouvo Elegance 135(AT135) 2011.now this is a thailand scooter 16"rims.as u can probably guess i would like 170ish big bore kit.thanks

Is the bolt pattern on a Honda 100cc four stroke scooter and the GY6, same? The bore x stroke on a Honda is a 47 x 63 mm.

What can i do to gain more power on a 139qmb EFI ?? I own a Peugeot kisbee and wanted to give it a little more power and top speed , bigbore kits wont compensate the fuel management

What you got for a big bore kit for a 39qma df50sst? Would like to inquire.

I do mileage and I have one like the pro built.

I was thinking he said he was talking about 50cc motor’s I’ve got a trike and I’ve upgraded it to a 80cc kit because I don’t know how big I can go. But I’m wanting to get the parts from him with piston already in so I only have to put g clips and rod threw it. But I don’t know how to get a hold of him to get the information and cost of what I am looking for.

LF161QMK engine any info on what size cylinder head kit I need..broken valve banged up the piston head?? Force 200efi 168cc

I'm interested in a big bore kit with a programmer on my 2019 150 pcx. Any suggestions?

Good Day Sir, what set up of block set do you advice for a 125cc gy6 scooter for performance and daily driver.

1st timer owner of gy6150cc here..

can 125c cgy6 fit in a place where the 50cc gy6 engine was, without any welding or cutting

hi sir recently 125 to 150cc just the block. and 19 to 24carb. but performnce still the same. what shoulf i add.

Hi there rolling wrench i have a Sym Crox was a 125cc! its got a 180cc bigbore kit and a bigger carb and bigger exhaust i cant seem to find an upgraded head or a camshaft that will fit (My cam shaft sprocket has two bolts holding it onto the camshaft) and my cam shaft sits in a cage (it dosnt split in half) like the older GY6 models is there anyway i could face time you on whats app to show you my engine to see if you can work out if or what i can get for it im pritty sure its a GY6 but i think it could be a EURO 6 if such exsists

What’s the status with the upcoming wiring harness??

Great info! I have had scooters for years and I and the kids had a blast with them. Decided to get another one (we rode the proverbial hair off of the old ones). Bought 2 grom 50cc clones (China) and what do you know they wouldn't get outta their own way so to speak so I did a 100cc bbk on em. Not faster, just adequate power for pulling hills and scooting from a stop. My question is this: Now that it has power it outruns the one gear pullies and will run past the redline so do you have or know of a CDI that has a adjustable (screwdriver style) rev limiter? I like around 92 or 93 thousand but each are different so I need to be able to tune them per application. Just can't put anyone on these things until I get that solved as most can't understand or feel too many rpm's. I like the bbk and they are no longer underpowered so you won't get run over on the street or slog up a hill at 20mph but without a rev limiter ya just can't put a newbee on it without the risk of crank bearing failure or worse. So a cdi with a manual screw driver adjustable rev limiter is key for me right now. Thanks in advance (no pun intended) for any help you can provide... Keep on scootin, Hippie Dog

Hi i have a Gy6b or gy7 my scooter has 16” wheels BN157QMJ-3 motor I’m trying to get a base gasket without any luck can you help?

Is there any way to order stuff to Finland? I only see germany and the uk being the only european countries available.

The ProBld cylinder looks to have more fin area, also.

I have a gilera runner vxr 200 it doesn't wheelie off throttle alone. Is it possible to make it wheelie. If so how.

I have a 150cc in a maddog icebear I use it to go back and forth to work witch is abt a 84mile round trip I already have the Transmission gear up kit and a NYC clutch kit but I was looking to get more out of the scooter and from what I gathered from this video it I would need the 171 dropin kit with a cast piston because of the mileage I drive or wat do u recommend? thanks in advance

Does cylinder wall thickness on these kits effect reliability? Will a smaller bore with a thicker jug last longer than the largest bore with thinner walls.

I had a gy6 with a 63mm piston a big valve hea a .820 crankshaft, an a10 cam ported head 34mm mikuni carb it was full taida engine thats a pretty quick scooter. People also put a 74mm piston and a 4 valve head and a .1020 crankshaft

I have a qml case, having a hard time getting parts for it.

Srry, basically I'm looking for bigbore kits for non GY6 horizontal engines and inquiring about the vino upgrades btw, the vino is the only scooter, the other engines are for pit bikes/dirt bikes of the Chinese types.. plz let me know, thanks

I would like to know if these parts are compatible with kymco super 8 2022.!

So would your 171 big bore kit work on my KP Mini 150cc? Would it give it more top end? I am only 120 pounds but I am looking for a top speed of 75 so I can bring it on the interstate.

What size jets should I use, it is a cheap 100cc big bore, so probably a 83cc or so, I have a performance air filter and exhaust, thanks

Will this go straight in a Lexmoto titan 2020 model

What would my 2020 kymco super 8 150 engine be with code kn30e?

I apologize if you answered it in the video, could i install this on a 50 cc gy6 engine, if not what would you recommend for a big bore kit?

🤔Now from a 50cc to a 100cc scooter big bore kit.Will the 100cc big bore kit work well with my 50cc scooter starter?🤔And how can you tell if you really got a 100cc big bore scooter kit and not an 80cc big bore kit?

i was thinking of buying the new xpro hawk 125cc which kit do you recommend

Hi Matt I found a big bore kit for my Piaggio Mp3 250 IE it Malossi 275cc big bore cylinder kit! Cost $524.29 plus taxes!

Could a gy6 with big bore kit get 250-300kg of weight up to 100kmh fast?

Will this fit on the QIYE 125cc motors???