Incredible 2-stroke engine build - YZ250 build

Mechanic Brad - Instagram @parapros
Hey guys, I am stoked to share another video from our YZ250 dirt bike build series. In this video we are going to work on 2-stroke engine build for YZ250, this engine is completely custom - performance and look as well. We are talking about the most important tips and tricks on how to build / rebuild 2-stroke engine. Check out the video and let me know your thoughts, cheers!
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my body armor: amzn.to/2xLpLOR
my knee guards: amzn.to/2xKzIvI
my boots: amzn.to/2sJlaqu
my handguards: amzn.to/2JiAq4C
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how to build incredible 2-stroke engine YZ250

[@chasemarsh125]

Nice! Been waiting for this one! 🤘

[@dirtniron]

thanks Chase, glad you like it!

[@harro9447]

Great video I can’t wait to see the final product 🤙🏼🤙🏼

[@dirtniron]

thanks man, me too!

[@HenryDarr]

Looks mint ! Stay blessed brother 🤙🏾🤙🏾

[@dirtniron]

Thanks! You too!

[@epp1733]

Insane built..!! Speechless... I think this will be the best bike built by far...

[@dirtniron]

thanks man, hope so!

[@chrisboehner5255]

Wow!! This engine looks beautiful and Brett is super knowledgeable you can tell he’s done this once or twice ..great video

[@dirtniron]

Thanks for watching Chris, appreciate it!

[@krp6147]

Love the video guys great to see it professional at work 😎👍👍🇬🇧

[@dirtniron]

Thanks 👍

[@bikelifesoldier5412]

That was a whole lot of moving internal parts for a simple 2 stroke! Now I'm praying my kx250f doesn't need engine work any time soon😥LoL. Great job and awesome rebuild video! That engine is a work of art👊✌

[@dirtniron]

thanks man, yea.. 4 stroke has few more parts for sure..

[@kyletracey5819]

Could build and rebuild 2 strokes all day. The 4 strokes would be a nightmare. Kid just bought a crf250. I helped rebuild his yz125 4 times. Have Never touched my kx250 in 3 yrs. Hope his crf dont need tore down !! Ugggg. Its a 2016 so he should get this season out of it lol

[@dragoslavpetrovic3616]

This engine is amazing, great work man!!!!111

[@dirtniron]

Thanks a lot, glad you like it Drago! such a cool name you have ;)

[@dragoslavpetrovic3616]

@@dirtniron Thanks man, and your channel is very cool.

[@noamgottfeld1237]

Looking amazing👍well done

[@dirtniron]

Thank you! Cheers!

[@user-qb4xr6ff9y]

Great video man 👍🏾

[@dirtniron]

Glad you enjoyed

[@robertwoods2505]

Looks great bro. 10 out of 10!! Great work!

[@dirtniron]

Thank you Robert! Cheers!

[@jjmckay6man1]

Beautiful Engine build Rado!

[@dirtniron]

Thank you very much!

[@tomatoknuckles]

Looks amazing 👌

[@dirtniron]

thanks, glad you like it!

[@samfahed9237]

The start is 🤤

[@richnewman1913]

Fantastic video thanks again Rado 👍🇬🇧

[@dirtniron]

Glad you enjoyed it Rich!

[@ktmkeith13]

Nice build ! Looks awsome

[@dirtniron]

I'm glad you like it

[@moto3moto419]

Nice having a quality manufactured OEM build to begin with , looks mint.

[@dirtniron]

thanks man!

[@DmDetails]

Good stuff Rado!

[@dirtniron]

Glad you enjoyed it, Thanks!

[@gladiadormotospecascromotx692]

Uau nossa que show de bola meus parabéns já ganhou o meu link 👍👏🏍🏍🏍✨🎇🎇

[@mikemccarthy6127]

That was great info on dropping the gear shaft assemblies into the case and then wiggling it around a bit to get the shift forks and drum in place. I try and get the gears and two of the three shift forks in all at the same time and it's always a pain. I'll try your method next time it looks way easier. I typically leave the ignition side crank seal off until after the crank is pulled into the case half. That way I can pull the crank into the bearing by using PVC pipe sleeve to push against the inner race of the bearing instead of transmitting the side load across the balls to the case half.

[@dirtniron]

glad you find something new Mike. thanks for sharing your info too

[@endurol8888]

End of the year my yz250x will be at 100 hours so I’m gonna full rebuild the motor, 100% getting it all vapour blasted to look new. Looking at yours now I want the bits cerekoted.

[@dirtniron]

it sure looks nice, lets see if we can also keep it this nice once we ride it

[@Han-vq5qs]

Do you race thats crazy your doing a full rebuild already

[@vince5946]

Absolutely beautiful engine. I love watching Brad work on engines, I'm very impressed with his work. Can't wait to hear that thing rip and excited for the smart carb performance, I think you'll be impressed.

[@dirtniron]

thanks a lot Vince, Brad knows his stuff, I really enjoy working with him.

[@samsti7680]

I love how youre so excited but your friend is soo bored :D

[@dirtniron]

haha, Brad was excited too, inside ;)

[@dashrides2679]

I love that color combo! I think a matte bronze frame would look killer too.

[@dirtniron]

thanks, glad you like it! interesting idea

[@ivanaryadi7802]

Dirt N Iron wa

[@vince5946]

Great vid, I love watching Brad work it's second nature for him. I Vapor hone items at my business every day and recently did my YZ 250 engine, turned out beautiful but man, you really have to pay attention and clean clean clean the hidden media. That stuff hides everywhere. :) and is dang near invisible.

[@dirtniron]

yes, thats right.. motoblasters did a great job cleaning everything

[@brad5664]

thanks vince

[@petertoridechannel9361]

great content! next step for my bike will be the boyesen reeds

[@dirtniron]

Right on!

[@CountryKidProductions]

Looks great!!!

[@dirtniron]

Thanks!!

[@CountryKidProductions]

Dirt N Iron no problem!

[@yoansanchez7175]

Wow bro nice and super Good jop

[@FIDDYgg]

When you mount your torque wrench to a box end wrench like that you've got to keep them in a 90 degree orientation to each other. You're adding leverage by moving the fastener away from the head of the torque wrench. Great looking build though!

[@brad5664]

only part true i use in straight line if you do the math on it then you just adjust the torque so it will come out to the same as if you where not using the wrench.

[@eliascamara3155]

Where do you even buy a box end wrench that fit a torque wrench ?🤔

[@GNX157]

Yea I’m sure they have the conversions based on how far away the wrench end is from the centerline of the torque wrench square.

[@ridehistori6229]

I'm from Indonesian.....and I really like your Channel...:)

[@dirtniron]

Awesome! Thank you!

[@lanesherman9075]

I watch a lot of build videos... I like them, but most are pretty boring, Thanks for keeping it NOT boring :)

[@dirtniron]

Cool, glad you like it!

[@Community-Action]

21:15 totally hate how he tightened the base nuts. Should of tightened with small increments in a star pattern.

[@willgreene3649]

And how he didn’t start some of the bolts by hand before using an impact.. begging for a cross thread

[@dmxracr9202]

Torqued to factory spec via forearm strength.. OMG shaking my head. And WHAT IS WITH THE silicone case half? NO gasket????

[@sambuvca22]

skojo3e hack

[@TroNPopz209]

@@dmxracr9202 yz250s dont use gasket. just permatex bud.

[@brad5664]

Well as you can see I did do it in crisscross pattern . That’s how you do it my friend.

[@michaelbarnato4220]

❤️macanic

[@recipe1973]

Love the music played sounds like dead concerts I’ve been to

[@zardportugal]

Beautiful.

[@dirtniron]

Thank you! Cheers!

[@eschrader]

Nice job. What I don't understand is why there are not a ton of negative comments on this bottom end rebuild video. All the others out there say "ooh you didn't torque in a star pattern" or "you shouldn't use thst adhesive". Crazy since it's similar to a lot of other videos I've seen but none the less great job!

[@MDM1992]

While its good practice, the reality is it doesn't actually matter that much, on true is on true, doesn't matter how you get there if the end result is the same.

[@patlanrusdi1483]

Its amazing.!

[@dirtniron]

thanks!

[@patlanrusdi1483]

@@dirtniron you are welcome...😂🙏🇮🇩

[@bryanslittlegarage5724]

Man that guy is good and the engine looks great.❤️👍

[@dirtniron]

Thanks bro, glad you like it!

[@nicholsvavak313]

So I have a question if I was going to get a high compression piston for a 150 KTM Sx what would you recommend and I would like to get a high compression head for it to

[@dirtniron]

vortex has good pistons, I have those in all the bikes I work on

[@dakotaha3250]

Any way you could list some specific tools that the average joe may not have, to tackle a build like this?

[@brandonbladen4691]

Love it man! Lemme know what old parts you still have kicking around. What are you doing with the other engine??

[@dirtniron]

thanks Brandon, second engine is not mine. I have PC pipe and tusk wheels from old bike.. engine parts nothing good ;)

[@brandonbladen4691]

How much for the wheels and PC pipe?

[@codycallaway2911]

Very nice.

[@dirtniron]

Thank you! Cheers!

[@scottmeredith8951]

Man the motor looks great. Only thing is where the reed cage bolts on the spacer goes in front of the reed cage. Looked like it was bolted on between the cage and the boot. I can't wait to hear that thing fire up!

[@dirtniron]

thanks Scott, glad you like it! I will make sure to put your parts to good use ;) thanks for that spacer, changed already.. it was a long day shooting the video

[@rcf3773]

I have a question for you I hope you see an answer this....I'm swapping cases on a YZ250 now I noticed on the shaft below the kicker you installed that bearing with seal on it facing out towards the clutch side, the cases I got do not have a seal on that bearing it's actually on the other side of the engine on the first Shaft with a seal facing out.. did you make a mistake or is this something they do different on the new yz the? one I'm working on is a 2000

[@dirtniron]

I am not sure, try to ask Brad on his IG @parapros

[@jimmychandra6469]

No rubber hammer, hitting the bearing, nice.

[@driver8438]

As an engine builder I really admire brad

[@brad5664]

Thanks Ken

[@driver8438]

Brad thank you and rado it’s these videos who help guys like me and guys like you before the years of experience get better right now I’m doing a 2008 kx250f complete case swap and bottom end 3rd and 4th gear was pitted ,,,you guys are a tremendous resource of knowledge and information and I’m grateful

[@haitzyice]

@@brad5664 awesome. Your skill set is sick to watch. Love the content. Thank you for sharing your knowledge

[@brad5664]

@@haitzyice thanks man

[@imagri1]

Have a crank installer right there yet use a mallet and then the bolts to draw the case halves together the incorrect way. Lmao MY MAN

[@imagri1]

Beautiful work BTW

[@garasioffroad5432]

nice i like this... from indonesia

[@dirtniron]

thanks!

[@metrolakes9109]

you guys need one of my engine stands!!

[@dirtniron]

Send the link, ill check it out

[@metrolakes9109]

@@dirtniron kzbin.info/www/bejne/g3e2fGSDmsl9ftU

[@jameswhiteman2337]

Cool vid , dude you work quick lol, that looks so amazing, wanna no does a1997 yz250 ‘4xl‘ gearing fit a1998 also‘4xl‘.. Have a yz but no sure if its a 97 or 98, has 3rd and 5th gears messed up, found 97 year parts but wanna no if they rele fit, thanks

[@dirtniron]

i am pretty sure it does, best way is to compare the part numbers for both gearboxes

[@jameswhiteman2337]

@@dirtniron cool , thanks, got the parts anyway cos evryone said they fit, and found it hard to match, what i needed, but according to evryone they work, il keep you posted, cheers dude

[@omarvillegas7161]

Beautiful engine! I want to paint mine as well how much did it cost and is it anodized?

[@dirtniron]

its called cerakote

[@drnyes]

Nice 👍

[@dirtniron]

Thanks ✌

[@Budivedder]

Nice 2 stroke engine

[@dirtniron]

Thank you!

[@matty8761]

wow nice.

[@dirtniron]

Thank you! Cheers!

[@jenslaursen1]

What i nice rebuild looks awesome ! But why would you put the 5mm spacer between the inlet and the membran? Why not just remove it? To me that will create a weird transition from the fubber to the membrane...

[@dirtniron]

thanks man, yea I have it on wrong side

[@kyletracey5819]

No left over bolts, clips or bushings?? Haha. Nice build. Nice working with all new parts. What was the total cost of parts and machine work if possible. Just curious. Liked and subscribed. Cheers. Be safe.

[@dirtniron]

thanks Kyle, glad you like it. I am not sure about the price yet, I will count it all together once the build is done. Welcome aboard and stay tuned!

[@kyletracey5819]

@@dirtniron thanks bud. Would be interesting to know what a complete build like that is. And appreciate you reply and keep up with comments ect. Most dont. Mirrored a cpl of your builds up on the 65" while making dinner. 👍 All the best bud

[@fredflintstone9449]

Glad ya know what your doing dude 😂😎😷

[@dirtniron]

thanks Fred ;)

[@carlos_araujo________]

Quero compra um motor desse mim em dica algum sair??

[@aesquivelful]

I have a question how many oz of oil is mixed per gallon I have an equal one and I would like to know exactly the measure

[@dirtniron]

do the math, I think 40:1 is good ratio

[@zmanel]

Great Stuff , can you tell us the color code for cerakote ? thank you so much

[@dirtniron]

thanks Pedro, it is burnt bronze

[@zmanel]

@@dirtniron C148, thank you that's what Im getting :)

[@lukethesheppard]

Looks awesome. When I saw the spark plug going in, I said, I KNOW WHAT THAT IS!!!! I’d need another 20 videos to explain what everything was and was for.

[@dirtniron]

haha, glad you like it Luke! ;)

[@joaowerneck3297]

good night my friends from the channel more dirt n iron po guys i am a fan of more of you guys on the channel. to complement what is already top and only with the same voves. because I see video I understand a little about the mechanics of motorcycles, but I don't understand anything you say kkkkkkk but I know that everything is right within the pattern. I am divulging to all my acquaintances your channel an embrace from your Brazilian friend, that the channel grows more and more.

[@dirtniron]

Thanks 👍 appreciate it!

[@Cereliabilqis]

🤘

[@marun8181]

Link it bro which company to buy all the parts and how much you are expenditure

[@marun8181]

Plz bro say

[@dirtniron]

www.rockymountainatvmc.com/ these guys have it all

[@lefterismonokrousos6132]

Rado i'm folling in love my frend with your enduroyz! I think i get on of this end do your thinks!!!

[@dirtniron]

Right on!

[@AdrenalineRushMX]

what ?

[@markleto8551]

What is the reason for pinging fasteners?

[@mc9304]

Peening. It deforms the fastener so it mechanically can’t move

[@neliaagan9088]

Idol

[@Ocgt]

How much into it were you in the end?? Turned out killer !

[@Ocgt]

Money *

[@dirtniron]

i am not sure, around 2k.. i had to do the cylinder plating and porting, plus cut the heads and then complete rebuild kit with full hinson clutch.. it piles up..

[@JohnDoe-du6yi]

Where did you get your bolt kit?

[@dirtniron]

its from specbolts

[@JohnDoe-du6yi]

Was it specific to that engine with the perfect amount of correct nuts and bolts? Or was it a generic organizer full of miscellaneous ones that you had to pick through?

[@HERISJOGJA]

Yeah

[@edwinardian1164]

What name head cylinder colour mr.?

[@dirtniron]

burnt bronze cerakote

[@asse1711]

Which year is the yz?

[@dirtniron]

2007

[@f64ecc]

With the bronzed parts I know you’ll feel better going over the bars the next time that thing seizes up.

[@dirtniron]

you bet!

[@juanma13555]

Es normal que el piñón primario no apoye los dientes completamente en el engranaje de la campana de hembrague ?

[@dirtniron]

I am not sure I understand you

[@juanma13555]

@@dirtniron I am referring to the primary pinion that meshes with the female bell pinion, in my yz 250 I see that one pinion does not completely mesh with the other ⚙️⚙️. is that normal?

[@nastysoda9212]

hot rodz bearings..... have fun doing another rebuild

[@charsiewestcott6419]

How did it perform?

[@dirtniron]

so good!! check out my riding videos

[@lindenphilippson]

Always surprised nobody mentions its a Chinese rebuild kit

[@brad5664]

first off not a china kit the cranks are made 100% made in the USA the main bearings are made for a company that makes 2 big brands of bearings so the kits are solid now they used to be china kits but have all been made in use for 5 years now .and the quality is so much better now i use about 3 -5 kits a week and never have problems if there is a problem most the time its user fault like dirt getting in or mix is wrong crap like that .. but trust me the kits are good kits..

[@lindenphilippson]

@@brad5664Soooooo many failure Storys on these cranks..So how is one sopost to know if their kit is the shitty china one or the USA one?? There isent..Not worth the risk..always go OEM

[@brad5664]

@@lindenphilippson they used to have a ton i agree but the ones made in usa are good for sure and they say made in usa right on them if they dont say that they are super old and wouldn't use them .made in usa all day long for sure .

[@lindenphilippson]

@@brad5664 Good to know. I have a hot rods crank in my 2003 cr125 that has over 70hours in it. Will keep an eye out for the made in USA Kits.Thanks

[@rfrankway]

@@lindenphilippson I am willing to bet every one of the crank failures is due to improper crank seal depth installation (covering/blocking the weep/lubrication holes from the transfer ports). I've seen it a lot....they get pushed in too far. This detail cannot be messed up.

[@husinalbana1522]

Kalau di rupiahkan berapa ya?

[@jakeday4105]

waddup with super excited? overuse!!!!

[@dirtniron]

Shall i say stoked instead? 😉

[@mbbeard3308]

How do I send my motor to Brad?

[@dirtniron]

DM him on Instagram @parapros

[@RAD_Family]

No fly wheel weight? Towards the end of the video your friend has a nice RC car top right of his shoulder!!!

[@dirtniron]

no FWW for now, letss see how she feels without it..

[@brad5664]

It’s the Baja Rey losi

[@bubaa1218]

Did anybody else notice that he forgot to put the O-ring on before he put the cases together?

[@dirtniron]

which O-ring?

[@bubaa1218]

Dirt N Iron 9:31 the o-ring that goes next to the crank it didn’t look like it was on there when he put the cases together

[@shokrefumi]

This is a definition of a "slapped together" engine. Defo knows what he's doing, but some moves are a bit risky.

[@dirtniron]

I wouldnt say so, the video makes it look like that... maybe...but Brad took his time with all the details, I am 100% confident this engine will run great

[@freedommonger4512]

what was the final build cost?

[@dirtniron]

I am not sure around $2k i guess

[@paknapak6441]

Do have CR 250

[@justin3949]

I wish I had this kind of motorcycle🤦🏼‍♂️

[@hitheshkumar4663]

Eagerly waiting to hear d sound of 2stroke

[@dirtniron]

me too!

[@Smiling_mike]

VForce!

[@gardosejohncarlo5791]

I wish I have a bike like you me and my dad only have a beat up kmx 125;(

[@dirtniron]

keep pushing, I started on old rm250 not that long ago.. good things happen if you keep working on something

[@justinpeterson8754]

I’m not sure I’d want this motor. He put it together so fast! 😬😉😂

[@dirtniron]

haha, should be ok cuz i will ride it fast too ;)

[@Jellegerritsen]

I'm more concerned about the hammer use when joining the 2 engine halves

[@johnhouston3681]

Just worry about lubing your chain and leave the engine work to us that know what we are doing

[@bikedogtor1663]

Nice vid but when he used the hammer for the crank shaft I cried

[@dirtniron]

thanks man, it was just a light tap with rubber mallet, we worked on plastic folding table plus the video is speed up so the hammer action seems bit harsh.. it really wasnt like that

[@franciscoalloatti1421]

Código del color gold??

[@marina3060]

Thats gonna vibrate. You should have sweated the crank in with dry ice , heat gun and laser temp gun.

[@widialoka9593]

😍😍😍😑

[@albertsky38]

Music sounds like a 80s porn movie.😂😂😂

[@victoroneill4381]

11.42 torqued them down without a torque wrench?? wow

[@nick4506]

you know locktite releases the moment it gets hot. just torque it to the right spec.

[@dirtniron]

thanks for sharing

[@user-ho7zr7ib9o]

ايه الحلوه دي

[@franciscoalloatti1421]

Gold color code? 🙏

[@dirtniron]

Its a burnt bronze cerakote

[@bambangwijanarko2241]

Can I order spare parts at your place?

[@dirtniron]

sorry, I am not selling any parts