HAWK BIG BORE KIT INSTALL (Full Tutorial)

LINK TO BIG BORE KIT
motocultparts....
full step by step walkthrough on how to install the big bore kit on your hawk 250. leave any questions in the comments. this was a ton of fun to make.
(intro and outro music)
Track: Near x Far - Not Enough [NCS Release]
Music provided by NoCopyrightSounds.
Watch: • Near x Far - Not Enoug...
Free Download / Stream: ncs.io/NotEnough
(head and piston)
tinyurl.com/3j...
(questions and where to purchase)
/ 538381033829344
(alt link to kit)
www.aliexpress...

[@mototaco6603]

Link to the BIG BORE KIT motocultparts.com/products/true-70mm-250cc-power-cylinder-and-piston

[@solomonnyirenda-y3c]

How is the 300mm cylinder head able to fit in the engine of 250mm. Looking forward to try upgrade my 150 to 200 if it's possible

[@solomonnyirenda-y3c]

How is the 300mm cylinder head able to fit in the engine of 250mm. Looking forward to try upgrade my 150 to 200 if it's possible

[@marvlb]

As an aviation mechanic, the best way to find TDC is just hold your finger on the spark plug hole and rotate until you feel compression, by using an aluminum welding rod or coat hanger laying on top of the piston continue the rotation until the rod start by down, that TDC.

[@michaelb.42112]

So, I'm in California where HAWK is not allowed to be delivered from Amazon probably due to smog, but I'm starting to realize why Harley Davidson is so loved. HAWK was made to be tinkered with, and in doing so you get to learn EVERYTHING about motorcycles and I think that is a huge appeal. There is a relationship between you and your bike and this makes it stronger.

[@mototaco6603]

my dad has the same issue. he wants a hawk 250 to use as a farm bike but he cant purchase it because of the state he lives in, they literally wont deliver it. i think we're going to work something out where i just purchase one and ride it over to him

[@michaelb.42112]

@@mototaco6603 Sick !!! Great idea.

[@domenik8339]

You modify a hawk because you want to, you modify a Harley because you NEED to. Huge difference. Also the 1,000% markup on parts from HD are more than a little discouraging.

[@johnvolstad5870]

Thank You ! Purchased the jug and piston kit from Aliexpress. Coming late jan. My Hawk does 72mph. Shooting for 80+! made a wind fairing from a grinder visor. Works !

[@johnvolstad5870]

BTW, I am an automatic trans tech for 42 years.

[@madfisherisme]

So did you get it done how did it go

[@Jboost412]

Worth mentioning when you installed the rocker box you did get the torque correct at 20ft lbs for 3 12mm bolts that hold it in place!! As well the head torque spec was also correct at 24/25ft lbs so again good job on the install video!!

[@67comet]

Enjoyed your video. I am a mechanic by trade, you did a pretty good job. (And I'm going to use some of your nomenclature with my co-workers because they work and they're unique (Pushrod Actuators = Rocker Arms for instance) -- good stuff, thank you for taking the time to show all the ins and out of swapping a piston and jug).

[@mototaco6603]

thank you friend

[@wafflesandcream9010]

In my mind they are solid lifters, rocker arms are pushing on the valve, so pushrod actuator does work here but not for rocker arms

[@dirtymotovation]

Don't do that. You will sound like you have no idea what you're talking about

[@AirGunPoland]

Are you sure it's 250cc not 229cc, and that after the upgrade, it gets 300cc, not 250cc?

[@Jboost412]

Nice video you made here I never had a chance to cover installation of the big bore so I’m happy someone took the time to do so!!

[@dennismorton4688]

remember the gaps on piston rings have to be in a certain position as the ring gaps shouldnt line up with other ring gaps

[@Airon79]

Staggered !

[@drmoose7233]

nice tutorial wasn't planing on watching it all but you've made it so good and so interesting to watch . you're a good sensei I must say . good job

[@mototaco6603]

thank u man it was alot of fun to make, still waiting for the cylinder to brake in a little before i do a top speed video

[@davidmarti8589]

same

[@BubbaB43]

When installing rings on any four stroke piston install the oil ring first then the two control rings that go above and below the oil ring. It's a lot easier that way because the oil ring has a lip on the top and bottom inside edge of it that sits behind the control rings. It's hard to explain but if you look closely at all three oil rings you immediately see what I'm talking about. Now let's see how many keyboard mechanics disagree with me on that lol. I'm just saying that method has ALWAYS worked for me and I've built my fair share in the last 30 years!

[@roadgaper2570]

Can you add a google image link to what you're talking about? I'm new to these bikes and I want to do everything as correct as possible when I finally install the big bore kit on my 250cc. And thanks for your knowledge !

[@Jboost412]

That’s correct!

[@Jboost412]

@@roadgaper2570 if you need some help with your piston rings I just made a video covering the process so they get installed correctly!!

[@johnvolstad5870]

Yes !

[@aedanharris2072]

Correct when installing ring you would first do the expander then the two scrapers then second ring then top ring

[@MyMotorcycleBlog]

Been debating going to the 300cc jug, and want to thank you for this video. Real help.

[@johnvolstad5870]

I purchased the 300 jug kit and it has 300 cast on the side. The piston pin hole may have a little offset. The valve reliefs were much smaller.

[@MyMotorcycleBlog]

@@johnvolstad5870 Please come back and tell us how the jug upgrade went(long term). I have on my todo list a 141cc BBK upgrade for my Boom Vader bike, but after that might add a few cc's to my TBR7 motorcycle after that. Thanks!

[@thelagmeister]

@@MyMotorcycleBlog They have a daytona 190cc and a zongshen 212cc that fit your bike. Both 5 speeds.

[@llmkartsco9958]

@@johnvolstad5870 has it still gone good?

[@johnvolstad5870]

Aliexpress is Great ! I ordered my 300cc jug kit on Jan 5, it arrived on Jan 12 ! 1 week, WOW !

[@fordlife6829]

where you able to get it runnung with this kit any other mods needed i cant find a video no where with this kit acually running

[@marcelrivero4509]

Great video. I'm planning on getting a hawk and start playing with it. Can you please recommend the big bore kit you used, there's a lot of them at different price ranges and I'm not really sure which one to use...thank you so much, again great content

[@hotrod7938]

Your cam operator is great she needs a raise 😆

[@danielheilig847]

I feel like I missed something here, this kit brings the engine to a 70mm bore and still 65 stroke leaving the displacement at 250.15cc. I'm not seeing how the cylinder wall would be thick enough to be bored out to an actually 300cc.

[@datvik7187]

Correct

[@lolol-vj7bc]

I was your 600th subscriber 😫. Getting my hawk 250 pretty soon and I’m getting more and more excited finding such good videos like these! Keep up man I’ll be along for the ride

[@junebug92x]

one of those sleeves is called a wrist pin 😁and should double check ring end gap too 😉 good vid bud 👍

[@mototaco6603]

Top speed and performance review will be VERY soon. Waiting for the piston to break-in just a little. 😁👍

[@michaelosborne6680]

U just inspired me to do this to my bike I really appreciate you going through and giving us a tutorial much love ❤️

[@Panasonman]

Awesome cant wait for your new video. I am getting a DLX 250 in a couple weeks. Do you see any issues I would have with putting the 300cc head on this DLX model with the stock EFI?

[@EasternSunset007]

@@Panasonman I’m also curious.

[@codyrichardson2527]

I was gonna put one on my Hawk dxl as well. Not sure if the computer will be smart enough to compensate. For 56 bucks though it’s worth a shot

[@chadmoyer1453]

Was the piston pin 16 or 18mm? Thank you

[@danielloustaunau467]

I really learned something you have a gift of teaching .

[@terrancemoody205]

Thanks for the video, really appreciated. You make doing my bore upgrade a whole lot easier 👍🏽👍🏽👍🏽

[@mototaco6603]

any questions/updates lemme know dude

[@adambrown3860]

I always put a towel on engine crank case hole when messing with wrist pin clips so nothing can fall in crankcase, cause I never want split case to get something that fell in the crankcase hole out. Lol But awesome tutorial on rest.

[@thurmanwilson1854]

I really enjoyed seeing your work and can't wait to see your next video on the gains made .

[@worstmechanicever7091]

Thanks, for sharing all that knowledge.

[@dennismorton4688]

a tiny scewdriver works great for removal of piston pin circlips

[@bbgcars]

FYI GUYS. "D" is a manufacturer mark for the company "DONGYA", DY means top ring and D means bottom, other companies like ATG for example will have "ATG" as top ring and "A" as second ring. Orientation doesnt matter as long as you can tell which is which by rubbing your fingers against the ring like he said which is corect. So in this case D will be the Scraper ring NOT THE COMPRESSION RING like hes showing (according to the manufacturer) and also "IN" on the top of the piston DOES NOT MEAN Inside the frame or whatever he stated.. IT MEANS "INTAKE" VALVE! so the "IN" means the piston needs to be orientated facing the INTAKE valve side of this engine and not the EX or EXHAUST!. has nothing whatsoever to do with the inside of the bike frame. just my .02.

[@marcthebarber239]

Haven't watched yet but man I've been waiting for this one, literally just now got the notification

[@anthonyyoung4978]

Really looking forward to the performance test on this. Thanks man!

[@mototaco6603]

check newest video

[@carl2591]

not sure if i missed it but the rings especially top and middle the gap should be 180 degrees apart.. oil ring same thing.. also its called wrist pin through piston and connecting rod from crank. :) also good to put a bit more oil on the rings for insuraction of piston in the bore. just helps with first start to prevent scoring of the cylinder walls. good job.. :) enjoyed it.

[@dennismorton4688]

true

[@michaelhutto2521]

this tutorial is so simply stated,with exquisite videography,i think i can change mine out,what hp increase are you expecting? top end?

[@mototaco6603]

really only about a 3 horsepower difference

[@gthugfoshiz]

I could be wrong but I believe this kit increases your bore size from ~67mm to 70mm and leaves the stroke the same (~65mm). If this is the case it increases the displacement from 229cc to 250cc. That being said, for the price it still seems worth it and kind of awesome.

[@gthugfoshiz]

As a side note increasing bore size to ~77mm which would give you around 300cc displacement could cause fitment/cooling issues 🤓

[@Jboost412]

Yes sir the big bore makes this engine go from a 67mm bore X 65mm stroke 229cc to a 70mm bore X 65mm stroke 250.2/250.4cc can’t remember the final displacement but it’s .2 or .4 anything beyond a 70mm piston the rod starts having long term reliability issues so I’m working on increasing the stroke to achieve somewhere near a 300cc…then I get to find out what else fails 😂

[@roystevenson9190]

You are right it's not 300 it's 250ish

[@bakemann]

Do you still have the same head on it? I've decked my head .04 port and polished and have a thin ss head gasket. Will it still work on that 300 jug?

[@dennisbeck7027]

I enjoyed that so much, excellent outstanding video you worded everything simple, add professionally, I definitely give you five stars rating for that ...

[@itsjewc]

I’d love to see a video on your carb tune and setup with this

[@HawkRider304]

has anyone done a dyno before and after this upgrade? I am curious about how many HP that superhawk has.

[@AntiPattern328]

Stuff rags around the rod and over the crank case before pulling the piston pin clips just in case you do drop it, you don't want to pull the cases apart!

[@brettabraham4949]

Great video! I’m gonna be picking up one of these bikes shortly, but I’ll wait on doing this. How’s the bike doing today?

[@WoodsmanHobo777]

Very good thorough instructional video. Great watch and great job

[@AlexNieto-o4x]

Please provide the manufacture of the bug bore kit, and/ or part number.

[@011CJ]

Did you check the gap on your rings? I want to watch an update of this guy to see what the 300cc can do compared to the factory 230

[@user-fy5yu1so9m]

So first thing nice job bud,so I just picked up this hawk bike darn thing runs good but the intake carb boot is bad ,so I got a couple questions, to install a new on do I have to take my tank and breather box or cam I just wezell the carb outta ther and install the new one . Thanks and keep up the info it's vary helpful..Thanks agin

[@gabeeddy3507]

Nice Tutorial, im looking forward to doing this im just waiting for my kit to come in

[@anthonybrown3476]

Great video .I have a hawk but can not figure out which 4 stroke model I have can you help

[@johnkoelliker8480]

Awesome! I'm going to do this to a brozz. Thanks for the great video and all of your vids. Geaux Saints

[@motomaebe9796]

how did this go on your brozz?

[@dcardenas171]

Great tutorial, looking forward to the next video.

[@DirtyDred10]

Nice video can't wait to see what the Top Speed will end up being

[@martymcmannis6581]

Wrist pin, not a sleeve Piston rings should be gauge in the cylinder before installing on piston. Most rings will have a dot or number that faces up. If you have a arrow on top of piston means arrow faces towards exhaust . If you have new gaskets, use them

[@esmeben]

Excellent instructions.

[@nakoawarrior3186]

KOOL, NOW MORE PEOPLE CAN IMPROVE THE PERFORMANCE OF THEIR'S.

[@RedfishInc]

Bro, you didn't gap the rings? Pretty ballsy move considering the source of your parts. Appreciate the video, always enjoy watching horsepower mods on these Chinese bikes.

[@bakemann]

Hey man. Great video. Could you provide a link to the bore kit? I can only find a water cooled modle

[@chadmoyer1453]

Was the piston pin 16 or 18mm? Thank you

[@JoseDiaz-dm8kb]

Great video. Could you please let me know where I can order the 300 kit.

[@Scott.Farkus]

IN doesn't mean it points in, the engine is in the middle of the bike so any direction you point is out; IN means Intake Side of the head.

[@ergr72]

I want to know your new top speed

[@johnstone9670]

Great video! How is it running with the 300cc top end? Did you do any port and polishing to your head?

[@johnvolstad5870]

I will do some bowl blending and port matching. They say to polish the exhatst side but leave the intake side rough to help fuel atomization.

[@brocfuck8993]

I took off the odometer but I'm pretty sure I've got over 150 hours on my Hawk 250 real off-road riding and wheelies because I stripped it but lately it's been making a bunch of noise from the top end of the engine I bet I'm going to have to replace valves and The Jug including the piston

[@natvega1]

How is your piston rod going to like that big bore kit? As I understand that Rod is for a 67mm piston and the crank shaft is designed for a 67mm piston and the bearings too, so it will be fun to see how it goes for you in the future.

[@dirkpitt5468]

Did I go past the ring positions? Make sure all the ring openings are not lined up.

[@mrpanda8472]

Where can I buy this 300cc kit

[@lv-blackhawk]

Awesome work👍🏻

[@josejordan7528]

Sweet Hawk!

[@anti-socialistsocialclub6032]

Dude thank you. Not many good videos on these china bikes. My TBR7 had 6k on it and is still pushing. All a stock besides gearing and cosmetics like the bars wheels and stuff like that. I’m ready to beef the engine up a bit.

[@seanzanni2437]

Shouldn’t you run a aftermarket head of your going with a bigger cylinder for best performance?

[@GPgundude]

If you’d stuff a clean rag into the case beneath the piston, you wouldn’t have to worry about dropping something into the crankcase!!!

[@hankbadfinger2780]

I've got a BD50-7 ( AKA xpro 250).....I was wondering if this kit would work for mine even though it's fuel injected?.....by the way, awesome tutorial, always love anything I can find about these Chinese bikes....I think the quality coming out now from companies like cfmoto,and the affordability of these bikes are going to really take over within the next five years.....we should start seeing a lot more china bikes out here in the near future

[@Jboost412]

For the fuel injected version of a CG 229cc yes it work’s essentially the engine is identical internally & externally main difference is fuel delivery & your mt05 ecm will need a tune afterwards

[@eclipseman0609]

@@Jboost412 How would you get a tune for it if you did the 300cc jug on the DLX EFI?

[@stevenengstrom2816]

Assuming the Magician 250 and Hawk 250 are basically the same motors, would you believe this would be the same process? I'm looking to order a Magician here soon just to have fun with and modify.

[@dkel4341]

Great tutorial! I am curious what kind of gains you will get. I just might try the DLX out if you can gain 25% more power. I am also curious if you could buy a water cooled cg300 and fit it on a Hawk without too much custom work.

[@glefic]

Would you have to do anything to the ECU on the DLX?

[@dkel4341]

@@glefic yeah, definitely would need a new tune for more air and fuel. The stock injector might work, but if it couldn’t supply enough fuel, you would probably need to find a way to rig up a bigger one.

[@johnvolstad5870]

Please, Moto Taco show a picture of a compression gauge psi reading with the gauge still hooked up. Please tell us the brand/manufacturer of the kit as you showed the parts on a styrofoam packing thing. Thank You ! P.S. Enjoy the Daytona 500. It is coming on soon on FOX.

[@stinkyllama]

Base on the bore and stroke of a stock Hawk 250, engine displacement is 229cc, after installing this bore kit the displacement will be 250cc

[@speedyme200]

Yeah what a scam... wouldn't be surprised if they change the name and marketed this as a 350cc Big Bore

[@rogervigulaboy]

I bought the kit listed in the description but the pin didn't fit. Bike is 15mm and the lut came 18mm. Bike is now open and it didn't fit.

[@johnvolstad5870]

Please tell us the brand of kit you received. I got the DVNOP brand with the coated flattop piston. Had Austin Auto Machine turn the sleeve down to 74mm. Put the pin in the piston and connecting rod. Slid the piston carefully over the rings. OMG, the piston top was a full 3mm below the deck of the cylinder jug !!!! put it together anyway and managed to get it to run. put compression gauge on 50PSI of compression.

[@MatthewWhiting-c2x]

I am in Ecuador and this is a great video for me and my Daytona adventure 250. But can you tell me where to get the big bore kit here.

[@ItsCheechFool]

You ever looked into swapping a 2 stroke motor into one of these china frame? Anybody you can point me towards? I been looking at a kx80 kdx80 cr80 cr125 2 stroke type of deal. The kdx 80 2 stroke looks like it will bolt right up with 15hp and great torque.

[@BUILDNIGHT]

We wanted to see it run! …..and a 0-60 run.

[@jeromejstafford]

You make great videos Moto ♥

[@EdP-j1t]

Did you check Gap of each ring in the cylinder?

[@stevej00]

Great tutorial! Ty

[@ferberb9662]

Nice first time seeing this video I been thinking of buying one to go cruising does this upgrade work in all 250cc hawks or in some models only

[@mototaco6603]

any stock carbureted hawk 250 this mod will work

[@javiersegovia4473]

Sweet vid...

[@chrisdenetso]

Did you have to machine the cylinder sleeve at all? and the piston pin was 18mm?

[@kamotecruiser4083]

Its a simple plug and play block, nice! How did it go? Did you encounter any problems with the new block?

[@mototaco6603]

None whatsoever, ive yet to leave a review for said jug but after im done visiting family for the holidays ill get right back on it

[@michaelkrahn9487]

Will it work for the TBR7?

[@_BlueCollarGamer]

How much engine life should I expect to lose on average when installing a BBK?

[@Dragoninja833]

Wow, you didn't hold the flashlight much for your dad, huh? 2:24

[@iwogen1815]

Hello, is it possible to convert it to a real 300cc? If so, give me some information. I'm wondering because I have a fuel-injected version. What else should we convert?

[@tjthenovicerider1138]

Please seal the Conrod with a towel so that things can't drop into the crankcase and save you from doing a total overhaul

[@eccentric_narsic]

Listen mane I don’t know how to say thanks but ima just give you the gist details I have a Tbr7 250 basically I’m buying a cg250cc > to a Cg300cc basically the part you said we are replacing and everything else the seals and piston all that

[@eccentric_narsic]

AnywAys I want to say thank you because without this I wouldn’t be able to save my bike it’s eating oil and I believe the seals are fried from putting too many aftermarket mods (carb, cdi, ignition coil) and basically burnt my engine so I’m hoping this big bore kit will save my bike and then I should be set for the exhaust ! I know I’m probably talking to myself but if I can get in contact with you for any help I would more than appreciate it I’m just starting to get into this and if I replay this video long enough until I build the confidence to order it I should be able to know exactly what I’m doing 🫡🫶

[@phx10690]

I never heard of a connecting rod being referred to as a crank pulley. I learn something new everyday.

[@oleflapjack2433]

"in" is for intake by the way

[@Airon79]

Do they make appropriate-sized heads for the 300cc bore kit ?

[@Mt24855]

Been interested in doing something similar on my 125 it doesnt add much tho its still all the same gearing as stock

[@turboman4736]

Just got one question why did you check your motor off your bike and replacing the jug you don't have to time it when you have no timing chain

[@mototaco6603]

no reason other than making it easier to film

[@ethandove4390]

Ordered the kit and the wrist pin is 18mm but my bike is a 16mm and the cylinder is bigger than the original so it doesn’t fit on the engine. Any suggestions? What year hawk did you rebuild?

[@angelavila4367]

What parts are needed I want to do a bore install on mine but what is needed

[@Door-opened-to-closed]

So I have the new Hawk 250, it has the counterbalanced engine (carb).... unfortunately this kit wouldn't be a option, anybody know the wrist pin size on the new motors? or a big bore kit that's sustainable for the new hawks.

[@christopherlanger3159]

Cheez and tacos!

[@HawkRider304]

now wait..rubber seal above or below gasket?

[@williamchew7814]

There is no timing chain ? its a gear driven cam.... if so I am impress with the engine tech.

[@mototaco6603]

Push rod actuated gear driven, almost impossible to kill

[@izayawalker6358]

I use link for the engine and it doesn’t fit. The sleeve was to big I’m walking around depressed again… haven’t felt this in a while but still live the videos

[@lu9thix]

how would it work, if i have v-twin 125xl honda varadero engine.

[@adamlong54]

So did it give you more power and more top end speed?