GY6 BIG BORE KIT 172cc / 171cc / 170cc (61mm)
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- เผยแพร่เมื่อ 9 ก.พ. 2025
- FULL KIT:
www.rollingwre...
171 KIT ALONE:
www.rollingwre...
It can get super confusing when choosing a big bore kit for your GY6 engine. Not all 61mm kits are drop in. Some call a 61mm big bore kit a 171 while other cheat and call it a 172c and some even under estimate the kit calling it a 170cc. Bottom line our kit is a drop in gy6 big bore kit. Not all on the market are! We have 15 years of experience building these GY6 engines. Don’t fall for a cheaper kit that Joe Shmoe is selling just to make a buck. This is our passion and you have our support. All of our big bore kits have the piston ring end gaps measured and installed on the piston. With the 61mm piston installed into the drop in cylinder. It doesn’t get any easier to install. Follow our step by step install video.
![GY6 171cc / 172cc BIG BORE BUILDER ENGINE KIT [A++ PERFORMANCE]](http://i.ytimg.com/vi/6yABpnaqd1Q/mqdefault.jpg)
Thank you for info and video! Mr. Matt
My pleasure!
Congratulations on your product line. It would have been nice to see some data on the performance of these big bores.
Not sure if your claim to having the piston assembled inside the cylinder is a benefit when it looks like it needs to be removed in order to install the piston pin to the crankshaft.
If that is the case, why not scalp a radius relieve into the piston sleeve, allowing the pin to slide straight into the piston and crankshaft? Cheers.
I’ll have dyno data soon. As for as the piston pin. It can be installed without removing the piston from the cylinder. Simply slid the piston down far enough to slid the piston pin in and out. I appreciate the support
nice stuff you got there, I was wondering what happens to the valve timing after changing the base gasket to change compression.
It’s such a minor change that you won’t have to worry about that
Which kit would work on the Xpro Storm DLX 150 dirt bike I think it says it has a zongshen engine.
Thank you so much for the help, what does OFF-SET / Non OFF-SET mean. I'm very new to this
Hi, I would like to order such a big bore kit to make my Kymco scooter faster. But it has an EFI system and I wonder if this will work, or do I have to enlarge the injector or adjust the mapping?
How much limit km can get?
Is that for 1P57QMJ or 157QMJ?
How do you calculate CC? how can you know how much cc you just added to your bike I have a 150cc and added so many thing big bore kit and everything but i don't know what to tell people when they ask how many cc does my bike has
1p57qmj buggy howitt engine im trying to order a 171 big bore forged kit with the carb and a gearing for more top speed witch one do you recommend
I have a kymco 150 scooter what is the best big bore kit for it
Hello! I love these big bore kits. Do you know of a decent drop in big bore kit for the Honda Helix / CN250? I've got a Helix clone and I think it'd be neat to bore it out to around 300cc for riding two-up easier. Thanks!
Question Greetings, my friend, I have an engine that is a new 2024 Zuma imitation and it is a 150cc carburetor with all the specifications in your videos for the 171cc kit but the engine number does not have the P, it is only 157QMJ, not the 1P57QMJ, did it still work for me?
Yes our 171cc big bore kit will work on your scooter engine
Hey bro,just asking what is the size of stud spacing in bore of 152QMI-2?thanks...
Can i knstall this om a Peugeot kisbee 2013 50cc? 😅😅
I am about to buy it. Still confused if I want cast or forged. If I'll go with cast, how much of performance will be lost vs forged? If I'll go with forged, how much life expectancy will I lose vs cast? Also, on one item on your website it says to go with forged for long life, this is directly opposite what you claim in another video. Thus, I am 100% confused what I want.
It depends how you ride it. Forged will last longer if you abuse it / ride hard and aggressively. Cast will not last as long, it’s not as strong. On the other hand , cast will last longer if you are just a cruiser. Forged is for weekend rips! Cast is for everyday riding. I personally choose forged.
@@RollingWrench I am that boring rider who cruises.
@@RollingWrench is the slug a 4032 or 2618 alloy? If it doesnt last as long as a cruiser it sounds like a 2618. A 4032 alloy would allow a closer piston to wall clearance like cast while being much stronger
I got your drop in 171 ncy kit. When installing it the T mark or line beside wont stay lined up unless I hold it in place.Any help would be appreciated.
Ya just hold it in place
Is it necessary to run a velocity stack insulator under carburetor intake I always wanted to know the purpose of the insulator
No, it’s more of a temperature insulator so your intake manifold doesn’t get hot and eventually your carburetor heats up too
@@RollingWrench ten four Thanks
Will this work on any 150 gy6. Scooter?
What can i get for a 161 qml
gy6 150cc valve tightening problem??
Very nice educational information. I'm new in the community of scooters and i"m seeking advice and I have a couple of questions if you don't mind. I've recently acquire a brand new Chinese scooter with the following engine code: BN161QMK-A and these scooters are marketed as 200 cc but according to the specs on the label it is actually 169cc. Is there room for upgrading piston without boring the case? if so, how big can I go? Any recommendations for improving speed and performance without going on hardcore modding?
Could you tell me which/if one of these GG6 engines will fit a Can Am DS 90X. Currently has a 90CC engine, but we're looking for more power.
I’m not sure on that model
I’m looking into picking up a new scooter I currently have the zuma/ ice bear vision 50 big body scooter do you think I should get the vitacci clash 200EFI 168cc scooter or should I go with my bike as a 150cc which is not EFI which one should I go with! My only doubt’s are how dose it compare in seating position and feels when riding the clash on the road as there’s no dealers in my area to see it in person and the handle bars are non adjustable hopefully they are set in a comfortable position my current bike has the dash separated from the handle bars which you can adjust the tilt on the handle bars with the 2 clamps holding it I’m. definitely overthinking it but I would like your say on it lol😅
Choose the bike with parts support. Otherwise you may find your self in a pickle
I have a golf cart with this engine in it. Wonder if it will work on my cart
As long as it’s a qmj157 engine
@@RollingWrench how can i tell if it is a qmj157?
@@robertosolis3024 th-cam.com/video/zdrwJb8MLHI/w-d-xo.htmlsi=O6oOwkKsbRQiV7BS
Holy hell, I thought i was the only one. I'm running a gy6 in a 96 ezgo txt. I just installed this 172 big bore kit, (28mm carb, 28mm big valve head, 61mm forged piston) i bought the kit from rolling wrench mainly for the convenience of having the piston gapped and pre-installed. I've done a ton of gy6 builds(used to work at a scooter/motorcycle shop) it's a nice kit(the ports on the head were a little rough, I went ahead and polished them out) but the kit went in without issue(my motor is a qmj157)
Curious how you mounted your motor. On mine i cut the back half of the cvt case off and welded on a thick aluminum plate. Then drilled it out to mount on the rear differential where the electric motor originally mounted. It's a pretty solid setup, been running this cart for years now. It's cool to know I'm not the only one that dropped a little scooter motor into a golf cart.
It performs surprisingly well with light roller weights and a heavy contra spring. Enough low end power to get up hills with 4 people on the cart. And enough top end to hit 40mph(although it's difficult to steer above 20-25mph)
I ordered an all-sport long travel kit, so hopefully that will allow it to steer better at higher speeds. Still waiting on the kit to arrive(they have a 2 month lead time)
Where can we exactly order that bro ? Specially if a am in the phillipines
Unfortunately we do t currently ship to the Philippines :-(
Where I can order that
www.rollingwrenchdenver.com/products/gy6-171cc-61mm-performance-kit-and-kaboodle?keyword=kit%20and%20kaboodle
The ONLY time that a flat top Piston lowers compression is when you go from a domed high compression piston, which none of these engines come with
This is what I am referring to. Most 171cc big bore kits are domed pistons. Ours is flat top. Flat top has lower compression than domed. I’m glad I cleared that up
@@RollingWrench why would you want lower compression pistons? That kind of defeats the purpose of the bigbore kit. More compression=more power
@@lesheath6216 GOOD QUESTION:-)
Let me give you the 101:
Domed piston: Raise the acceleration via the higher compression, but lower RPM capability = lower top speed
Flat top piston: lower compression ( then a domed piston, but higher compression then stock) but they rev higher with its higher rpm capabilities = higher top speed.
Our ProBld performance cam shaft that is made for low to mid range power, gives you that lost low end torque back that a you would have gained from a domed piston.
In short, by doing a flat top piston with a thin base gasket (to raise compression) and our ProBld camshaft is the best combo possible. We have done a lot of testing on this. Also, because domed pistons raise the compression, they tend to kill those stock crank shaft bearings. The only time we recommend a domed piston is when you are in a place with high altitude such as Colorado. We loose compressed up here. A domed piston will match what sea level elevations compression is, keeping it just as reliable as if you had a flat top piston at sea level. We are looking for the most performance with reliability in mind. If you want to learn more about big bore kits here is a link:
GY6 BIG BORE KITS - EVERYTHING YOU NEED TO KNOW
th-cam.com/video/KMFUbyqRaV8/w-d-xo.html
@@RollingWrench thanks for your explanation, however I'm at higher altitudes as well here in the North GA mountains, so what do you suggest for those of us breathing thin air?
@@lesheath6216 same kit but with a domed piston. We offer those as well. Same price, I just haven’t put them on the website. If you want a kit with a domed piston click this and I can invoice you:
www.rollingwrenchdenver.com/products/parts-estimate?ToPasteboard
How mach yo sall
Как купить комплект?
I want to buy a block
www.rollingwrenchdenver.com/products/gy6-171cc-61mm-performance-kit-and-kaboodle?keyword=kit%20and%20kabo
Hi! I am living in Japan and I want to start buying a Ruckus and modding it without breaking my bank account. Is there any comprehensive starter guide in this insane world?
Thank you all!
So you want 50cc stock motor or a gy6?
@@RollingWrench keep the stock. But upgrade it.
What is the top speed? 🛵
Top speed doesn’t change much. Just like a bicycle, it doesn’t matter how strong your legs are, you can only pedal so fast. For top speed we want to change gearing. Big bore is for acceleration and not loosing speed on up hill inclines.. the muscle
Wish one are better Taida or PROBLD
Probld is Taida, but with some specs that are changed to make our kit better in my opinion
I want to install a 171 on my Genuine Buddy because of the better oiling system but also don’t want to machine my case lol.
We have a 161 drop in. No case machining
www.rollingwrenchdenver.com/products/stage-2-buddy-scooter-performance-kit?ToPasteboard
@@RollingWrench I did not know that. I’ll definitely be ordering it.
Top speed?
Top speed won’t change much. Because we are only improving the muscle not the gearing. It’s like lance arm strong on a BMX bike. You can only pedal your legs so fast. But you will get to that top speed much faster
😂 too slow my stock gy6150 more good than that
👍😎👍
manufacturer play government regulations until it hits them back = hit self = ...
assemblers are like 500x-seat user self-support OEM enterprise computing information logo help-desk customer-service = own IT department
accessories level for localisation of simple things like gy6
= kits and accessories at assembler (local legal type approved)
carburettor(climate), intake(usage), exhaust(legal noise), muffler(illegal noise legal money titanium spend), end-can(legal womenly looks), ... chassis-number, engine-number registration plates 2 numbers issue 1 number take money and ungrateful create even more problems until self implode and tell everyone who stu
Thats weak
Yaaa! I think so too. I’m more of a 232 kind of guy.
Would this work on a 50cc roughhouse ?