How to install a big bore kit GY6 171cc / 172cc (61mm). EVERYTHING YOU NEED TO KNOW!

[@freestyleskyline]

I love how straight forward this is. I think I'm going to be buying a lot more scooters so I can teach my kid and learn myself

[@juliodiaz4493]

Man and you look, you can look at it all you want at the end of the day. You gotta do it yourself.

[@stevebiggs1822]

I don’t even have a gy6 engine but still found it fascinating

[@RollingWrench]

P E R F E C T !

[@marvinmatsane7629]

It is better you don't have the gy6 engine while I don't even have a ruckus at all but I still find it interesting 😀

[@EsefDubs]

Same, but I’m tryna get one as soon as I have a garage

[@yewwtooob]

25:25 setting valve lash. You go on the bottom side (.004 to .005 and you pick .004) . Only thing is that as valve and seat wear( in a hot combustion chamber) the oil splashed cam and rockers wear less. This almost always ends up in valves that don't seat completely, which is accelerated by valve erosion and ALWAYS pronounced on the exhaust valve due to coefficient of thermal expansion differences based on heat/cooling cycles. Exhaust valve is only cooled from oil and seated contact (heat transfer). Intake is cooled by both those but mainly by cold fuel intake (reason carbs "ice up" is evaporation) in relation to relevant heat within the combustion chamber. If in doubt, ALWAYS set valve lash loose. Especially on the exhaust. They Will wear in and close the gap, so to speak.

[@oldwortex5818]

Thank you. Our 150 is just tired of the abuse my son did on it, so instead of buying a new engine, I decided to rebuild with a big bore kit. This is the exactly the video I was looking for. I will add the performance cam, larger carb (28mm or 30mm) and i hope this thing will fly :-)

[@ElPatronGamefarm]

Have you done the build yet?

[@FranklinHicks-qs4gs]

How'd the build turn out

[@SippiDeals]

How did it turn out?

[@synoptic1047]

Thanks for this like big time. I can’t find anyone to do my work, so I must learn.

[@Yakplanet_tv]

Hey with my cam lobes facing down. @22:07. My rocker arms HAS A LOT IF PLAY ROOM. SO I FLIPPED THEM. because I couldn't adjust the dowls on the valve. I have bug bore kit. With a-9. Cam. If I try to adjust the valve there's still like 1-1/2mm of play.

[@lienchen12]

This is a really good tutorial because you have a clear and step by step tutorial, I subcribe! Hit the bell and thumbs up..thank you

[@s0972821]

I am a Taiwanese. I just installed a 61mm cylinder on my 26year old 125cc GY6 scooter. It becomes young again！

[@RollingWrench]

Perfect! Did you use Taida?

[@basmu7067]

Just put a Mikuni carb in but popped the head gasket in the process when starting it up, ordering y’all drop in kit Friday I’m hyped

[@RollingWrench]

Hell yaaa! You will love it!!

[@protofreak9518]

Where did you get the crankcase breather/dipstick combo you don’t sell them just breathers

[@FreakinKatGaming]

Like seriously, I'm a mazdaspeed 3 owner, lost my engine... wel actually my car was stolen not long ago, anyways, over the years of learning about my engine, seeing this video I swear is like perfect for people who want to know a how their engines work and get an idea what pistons are like and how to work them as well as well long story short this videos good for anyone interested in their engines! Extremely versatile video just instead of 1 piston just add your piston count and rinse and repeat the process and just like the rings, 1 is 1 way the next one is opposite and so on and so forth, it's like a seesaw one up one down

[@awesomebrian4835]

The oil breather u have look like it have a dipstick with it too do you seek that whole thing exactly like the one on the video ??

[@brodjohn5993]

Because of your fully explanation I subscribed thank you hope more video regarding rebuild of GY6 150 motors

[@shaunaromine3709]

And the black hose at the top of the cover? You touched it and moved it a few times, but nothing about what it is for or where it goes. Would you mind explaining that one?

[@youtubeuniversity6589]

I love love love the gy6 out of all the engines to tear down to every last bolt the gy6 comes apart so nice and goes back nice easy to work on bullet proof and many many mods I love rolling wrench

[@berke1572]

Where did you buy that oil dip stick thing, with the air thingy.

[@ab_customz_llc]

As many others have already stated, great job! I just had to jump on the long list of others that appreciate your great content! Sub'd

[@deenie57]

C500cc mopead

[@171169alex]

Friend, I congratulate you, good video you explain everything very well, few videos of such good quality you can find and your video is the best I've seen in terms of mechanics, I have a buggy with 150 cc engine. By making this modification do you know how many hp I can increase? And finally, if I make this modification, will I have to change something in the carburetor? and you recommend some spark plug coil with more voltage? There will be a high voltage coil on the market for this 150 cc engine.? Thank you very much and again I congratulate you for your video, in fact you explain very well and the quality in hd is very well appreciated all the details. Greetings.

[@forevercomputing]

every engine is different.

[@stayinpositiveabiy5527]

Definitely

[@jdsstegman]

Did you check the ring end gap?

[@JamNJ1985]

Is there a way to get more power out of the stock ruckus without adding a gy6. I know a lot of people like the stretched look but I prefer the stock length of the rear.

[@raydreamer7566]

It would be nice to know the before and after HP ratings torque also would be great...

[@RollingWrench]

Yes I agree. Unfortunately I don’t have a dyno.

[@antonionavas825]

Thanks for the great video, lots of detail and well explain. I'm replacing the cylinder head on an old Lance Venice inherited from a friend and discover the old piston lost some fragments into the crank case. Any suggestions on how to clean this out or make sure there is nothing left inside that may create a problem ? Also I have no specs regarding nuts torque. what would you advice. Thanks!

[@yewwtooob]

19:00 to 19:11 true. But the reason is because the case is cut out. So he is saying if the alignment pins don't push in, they are in the wrong holes. Gasket is diagonally cut also for them. It only fits one way.

[@caambata]

would there be a change with the carb or jettings using 61mm block? I heard you can run stock 150cc carb upto 59mm block only. beyond that, jettings should be changed.

[@ipaddy]

this is the perfect how to video for the GY6 motor I have just done this build with a 180cc motor 63mm piston looks just the same except over here in the UK on our scomadi version of the Gy6 out motor hanging mounts are underneath compared to your top version and we have a disk back brake

[@MrSquire2010]

do you have a vid showing how to split and change out the crank

[@worldmilitary8901]

Hello..61mm piston can fit original crankcase?

[@MJSfoto1956]

just a hypothetical question: can the new head be installed with the engined mounted to the bike "in situ"? Or must you remove the entire engine to be successful?

[@DrLove911]

Sometimes yes and sometimes no. The fact that you ask that . Makes me think you should go ahead and remove your engine . Lol

[@fitzgeraldbernardbarnettcl7484]

Hai, you are very expert about scooter especially, i need a tips from you, i have a modenas elit 150 scooter, how to make it powerful than nw?... What do i need to change to?

[@kenm.6307]

Anyone know where I can find a replacement shroud gasket/seal? I cant find one for the life of me.. any help is appreciated. Love this channel

[@panchobello7408]

Hello. great and detailed video. Can you please leave the link to buy the long gy6 engine with the 171cc kit and carburetor already installed, that is, ready and tested to mount on my scooter, just make the connections and start?

[@jacobdenham4800]

Just purchased the 171big bore just and two valve performance head, also throwing in the A9 cam can't wait to see my scoot fly

[@RollingWrench]

Heck ya dude!!! That will wake it up for sure!!!! Thanks for the support 🙏

[@jacobdenham4800]

@@RollingWrench anytime great content and services going to do a custom build on a Chinese scooter a naked frame with custom mounts for everything all plastics are being removed now!

[@ragemotorsports4727]

Quick question.. I have the 157qmj motor on my buggy...what is the difference from the same motor on a scooter? Cause the item description says If installing on a buggy or sxs they don't guarantee fitment. just curious.

[@coltansmoak6977]

you should make some videos about 200cc or 250cc or 300cc mopeds/scooters

[@psychouki]

So you can use a 150cc head on a 171cc cylinder?? Reason I ask if because I've stripped out my spark plug hole and I'm trying to helicoil it now but I would much rather replace head in the end.

[@Sebastian-je7lq]

Is there anything you have to do to the fuel system or to the carburetor to adjust for more fuel for this change in displacement

[@MrJoe11young]

Great video! I just bought a Hammerhead buggy with the 150cc GY6. Thanks for the info.

[@SlowStang951]

Did you ever do the upgrade?

[@Tapsr]

Also on the piston should I order cast or forged? Thank you for all info

[@dagobertoarburola635]

Is it good performance just by changing the cylinder? Isn't it necessary to change the carb too?

[@SevanGuitars]

The breather on your site is much different. How do I get this setup?

[@christianfe8594]

Hi I can use this kit on my x-pro 125cc thanks

[@seishiro7000]

Have some experiene with motors but man , still learned someting new, great tutorial, thx!

[@ridewithserhat]

Its looks like sym jet 14 200i euro 4 engine right? Is it the same engine?

[@Surferant666]

Hello. What is the biggest upgrade i can do on a 50cc gy6 engine without changing the conrod and big end? Thankyou

[@jod5659]

That's what I want to know too what is the biggest big boy can I can put on a gy650 also did you ever get an answer I need to know also

[@Surferant666]

@@jod5659 i think its about 110cc- a Honda Lead cyclinder head is the same i believe as a gy6

[@Surferant666]

@@jod5659 i have a Honda lead 110cc for sale apparently does 75mph. Previous owner messaged me as he had put the bigger head on. £200 for whole bike. Spares repair

[@breezysmith4800]

I have a 150cc Advenger stark scooter. I want to be a lil faster and stronger... can i get this same set up fr my bike.. need to know asap

[@jameseldridge673]

Sir, I have a Tao Tao 150. What would you charge to build one of these, with an aggressive trans?

[@thaddeusowp3650]

Does the breather tube breathe or is it just a chamber to relieve pressure

[@caambata]

What's the name of the oil vent/cooler adapter(blue)? Tried looking at your website but can't find one.

[@jeffwhite9001]

Do the two top rings not have a top and bottom?

[@edwinator46]

I plan to convert from 125cc to this. Do I need bigger exhaust? And what about carb? Bigger jets?

[@jmac7272]

That was the single greatest tutorial video I have ever seen. Can you do my gy6 atk 150c buggy tao tao? To slow

[@RollingWrench]

Thanks man! Ya you can do a big bore kit on that

[@Smodlee]

How come I’m not getting any compression?? I gapped the rings all offset from each other and the IN mark facing the carburetor side. I can feel air coming out the exhaust port and my hand is getting sucked in on the intake but when I put my finger into the plug hole I’m not getting any compression so what am I doing wrong?

[@Nethrolloras]

does the 171cc kit require that we bore out the bottom end? or is it just a bolt on?

[@jacobdenham4800]

Bolt on

[@danielmoore394]

Can you find out if you have an a or B motor from the letters on the block

[@johnredman938]

I thought your website had crate motors on it for GY6 (Spiderbox) . Where????

[@yewwtooob]

Around 12:28 some rings are bevel and flat. Is so, then the bevel of the ring goes up, the flat goes down.

[@Screwdriversteve1]

Are the rings pre gapped or is this motor so loose it doesn't matter?

[@littlereptilian7580]

Wouldnt the too hight CR destroy the crankshaft or the connecting rod?

[@nerissaandico6524]

If we change the original bore, do we nee to change the carburator too?

[@RollingWrench]

No, you don’t need to. You can though

[@CreativeButcher]

Hey bubba. Love your video. I got to 18:58 where im installing the jug. And it dosent slide in to the case. I decided to smoke a cigar and drink a tall boy about it. But, i dont know what to do.

[@CreativeButcher]

I removed the jug and re razored the gaskets of the case ID. No luck.

[@CreativeButcher]

Half way thru cigar and tall boy, im thinking thermal expansion. Should i put jug in my freezer for a little?

[@iamjeromeflores611]

Whats the bore type of tao tao lancer powersports 150cc? Is that a gy6 also thanks

[@nerissaandico6524]

My second Q, you did the same clearance adjustment on the exhaust valve?, i mean .004 for the intake and .004 on the exhaust too?

[@RollingWrench]

That is correct

[@claudio67362]

@@shannon9487 0.004 is big enough for exhaust..Both at 0.004 is perfect

[@AdenSallaberry]

I have a water-cooled Gy6 thats fits into a Surfango surfboard. Could I do a big bore on that. The motor is 150cc and it is hard to find parts for the watercooled version.

[@serkanturunc6721]

Hi, which the Best camshaft for 58.5mm cylinder kit? A9 or a12? Thanks

[@rayrojas8883]

The hose that is hang down? my gy6 had it and it ripped off im tryna find out what it is and what do i attach it to

[@Vicmot]

Can you use 125cc Gy6 cylinder head on 180cc Gy6 cylinder? Whats the intake and out take diameters? - But you just mentioned smaller cylinder head adds to compression = power output. But how about those intake and out take holes? How much they matters for power output when using the default 125 cc carburator?

[@depdep229]

Hi I want to make it for 125cc, but the engine is injection, what adjustment is needed for this? thanks.

[@oualieddinemekhzoumi3599]

Mine says 1p57qmj. Would this cylinder fit ?

[@claudio67362]

Yes

[@DrLove911]

It's a 150cc look for 61 mm big bore kits . You can go up to 61 mm without case boring. Making it a 171 cc.

[@claudio67362]

Yes,the cylinder is the same as well as the piston and rings,the timing chain has the same number of links.The only difference is in the head..The aluminun where the camshaft sits is like 1.5 mm higher,off the top of my head so.it means it will not accomodate a camshaft with bigger lobes..off the top of my head i would say it takes a camshaft A8 or A9 but not higher,cause of the height..you can use a regular head to replace the original head..and make sure your chain tensioner compensate for the chain slack..I have seen after market chain tensioners that sell as being good for 125 cc and 150 cc and the stem is a little shorter.Hope this helps.There is a lot of missinformation about this on the internet includung forums by guys who pretend to know and in fact they know nothing.The 157 qmj and 1p57qmj are identical gy6 engines..

[@claudio67362]

Big Em..you are right,the biggest you can go without boring the case is 61 mm

[@DrLove911]

Some of the 61mm kits have thicker sleeves so you still have to bore. . Just be sure you get a drop in kit

[@imaginewagons1060]

My friend has a gy6 with the EGR tube, but my motor is also gy6 with no EGR valve what’s the difference in our motors? And can I use this big bore kit on mine with no EGR up front? Helllllp

[@labluediamond]

I want to do some upgrade on my trike I wonder if all these videos work on it cuz my Motor is spitting out oil from somewhere its not over fill with oil cuz I had did TBE oil change already so any help here

[@Kohnojake01]

What piston ring gaps should i use on 61mm bore ?

[@WadePluff-r2d]

Will 40 mm cvk carb work for this?

[@SergioTerol]

You make it look very simple. Im saving up for a second bike, it will be a gy6 scooter. In the meantime i wanted to ask, would your EFI plug and play kit work on a geared bike? It has a 26mm intake is a 125cc... but what i am worried about is: will the EFI handle the constant changes in the throttle or is it made specially for scooters where you dont play that much with the throttle?

[@RollingWrench]

Thanks for watching. Our efi kit will work in any bike up to 1000cc. We do have DIY EFI kit out now :-) www.rollingwrenchdenver.com/products/diy-rolling-wrench-fuel-injection-kit

[@PaumotoRacing]

AWESOME TUTORIAL !!! From Philippines

[@loydonnrodriguez5275]

tara mga nka 150/pwede pla hanggang 171 panu kaya intake at exaust pwede parin kaya stock carb at pipe?

[@kachiskid]

Matt quick question, I gonna drop my 171cc today, is it still filled with 750mL of oil?

[@juliodiaz4493]

This guy could work

[@juliodiaz4493]

I'm learning from him

[@juliodiaz4493]

You gana do yourself big bord Kik

[@DIYunpolished]

The big broad Kirk is the next best thing. Dem thangs be haulin arse after you drain all the oil out. Less weight in the engine 🚒🆘💥😳

[@frankryan6405]

Great vid mate you explain everything thing in detail. It looks like you don't need to re jet the carb is that right?

[@proteusmacapagal1453]

sir its that okay to use stock camshaft without camshaft stopper plate?

[@wesleypowell7903]

I have a Question how much would it cost for a brand new GY6 engine 150cc

[@RollingWrench]

www.rollingwrenchdenver.com/products/gy6-150cc-long-case-engine-ruckus-metro-swap-motor

[@DrLove911]

You can get one off eBay for around $250.00 but you don't know what you'll get

[@4204-m3z]

I recently bought a 2020 150cc ice bear q6 trike, don't know nothing about this Brand n I cant find no reviews about it. Are they any good? Are they able to keep up hours of stop n go n Long drive as well? Can I upgrade modified it? What issues do I need to look out for, what to I need to replace if anything. Any info will b great plus I'm a 300 lbs dude any help will work plus I'm new to this world of scooters.

[@couragegames4dayz549]

Will this work in a Vader 125cc?

[@JordonOneill-v6l]

does this work with the pcx 150?

[@claudio67362]

I want to buy that breather but i do not see it on your website...Help

[@juandelacruz2188]

Why you did not place the piston in the top dead center before you disassemble the cylinder block?

[@RollingWrench]

Because it really doesn’t matter.

[@rockydog3106]

Thanks for putting up some great diy videos 👍 how can you tell if you have an A or a B case without opening it?

[@NCYSTORE]

You can tell by the engine model number engrave on the lower part of the crankcase near the side oil drain bolt. If it says 125QMI", "157QMJ", "1P57QMJ" those are 54mm stud spacing A block (case). If it says "161QMK", "161QML" you guess it those are B Block 57mm stud spacing.

[@CannondaleF700]

NCY STORE what about p152qmi or the 153qmi KDU engine

[@NCYSTORE]

fishsticks A-block is considered 54mm stud spacing normally 125cc "QMI" , 150cc "QMJ" and both can upgrade upto 171cc engine without boring. Now, B-Block is considered 57mm stud spacing commonly use for 180cc upto 232cc engine if you want to know how to decipher more gy6 engine code checkout ncystore.com/blog/gy6-engine-code

[@CannondaleF700]

NCY STORE So you reckon my p152qmi engine I can fit the 170cc kit without boring case? But those cheap china $40 170CC won't fit because of the jugs walls? But you kit does? Right?

[@NCYSTORE]

fishsticks yes, NCY and Taida are only one that makes the bolt-on bore kit. What makes it a bolt-on is there cylinder skirt aka sleeve diameter is less than 63mm closer to 62.7mm or 62.9mm diameter to be able to slide in most A-case bore opening on crankcase is 63mm opening and Rolling Wrench should have them.

[@MarjanSpasevski]

0.04 is to tight clearance for air cooled engine, u need to put 0.10,when its get to working temp, tht clearance is 0.05, and u nvr gonna burn your valves,just my opinion, cause i have 170 cc gy5,157qmj block and its going 115kph tht would be 71 miles per hour btw good tutorial

[@RollingWrench]

I appreciate the support 🙏. All the details in this video is what’s worked best for me in my 18 years of experience.🤘🏻👍🏻

[@donnets4you2]

This might be a stupid question. I just recently purchased and Ice bear mad dog gen 4 150cc originally now board out to 171cc. The person said use 10-40 when changing oil on crankcase says 15 - 40 which is correct. Please help

[@RollingWrench]

Gy6 motors can use a wide range of different viscosity’s. You can use one or the other. It doesn’t matter.

[@martymcfly4083]

What about grinding the ring gap to spec those rings expand when hot

[@RollingWrench]

That is somthing to consider. Fortunately my kits are done for you already.

[@jairusjohnson8736]

Could this apply to a x18 pocket bike 50cc

[@jamesbalsley6135]

i need that oil decompression kit, where do you find one that is dipstick compatable???

[@fabistn1]

This kit affect realeabilty of engine?

[@pooch83]

Is the TDC mark on your lighten flywheel as well?? I didn't even think about looking when I installed it.

[@RollingWrench]

Yes :-)

[@bruceclark5627]

Is a kymco super 8 150 a gy6 motor?I'm completely ignorant when it come to scooters.

[@Shane-mj9fz]

Where is the dipstick with the breather attached, like in this build? Looked on the web site and could not find it.

[@RollingWrench]

We can’t get them anymore :-(

[@jamesbalsley6135]

@@RollingWrench is there a brand name on them so i can search on ebay in case anyone is selling one they already own?

[@ramranch887]

hey so I have a 1p57qmj,really having troubles with finding a rebuild kit...its started spewing oil out of the exhaust..do you have the parts for the 1p version?

[@tonytallini159]

Where does that hose go that comes off the valve cover?

[@SBATHORGOD]

Can you tell me what my stock engine size is? So I can do big bite kit upgrade.. I have Chinese engine stock 162qmk1

[@King-Kings103]

Can a GY6 motor, an rear tire be placed on the Dong Fang 200cc

[@walangmagawatv08]

hi rollingwrench, I would like to ask if all 157QMJ engines (China), will fit the 61 mm big bore kit without modifying or boring the hole for cylinder wall? thanks.

[@euroimports05]

my question to u is which big bore did install that u didnt have to bore the case ? what brand ?

[@jhitt79]

Why wouldn't you put the rings in the cylinder bore first to measure the ring gap with a feeler gauge?

[@jdsstegman]

Because all these parts are made to such amazing quality standard that there is no need to check ring end gap.