Incredible 2-stroke engine build - YZ250 build

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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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how to build incredible 2-stroke engine YZ250

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Опубликовано:

2 май 2020

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Комментарии : 270

@epp1733 4 года назад

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

@dirtniron 4 года назад

thanks man, hope so!

@chrisboehner5255 3 года назад

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

@dirtniron 3 года назад

Thanks for watching Chris, appreciate it!

@bikelifesoldier5412 4 года назад

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 4 года назад

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

@kyletracey5819 4 года назад

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

@HenryDarr 4 года назад

Looks mint ! Stay blessed brother 🤙🏾🤙🏾

@dirtniron 4 года назад

Thanks! You too!

@moto3moto419 4 года назад

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

@dirtniron 4 года назад

thanks man!

@dashrides2679 4 года назад

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

@dirtniron 4 года назад

thanks, glad you like it! interesting idea

@ivanaryadi7802 4 года назад

Dirt N Iron wa

@harro9447 4 года назад

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

@dirtniron 4 года назад

thanks man, me too!

@mikemccarthy6127 2 года назад

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 2 года назад

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

@noamgottfeld1237 4 года назад

Looking amazing👍well done

@dirtniron 4 года назад

Thank you! Cheers!

@samfahed9237 4 года назад

The start is 🤤

@richnewman1913 4 года назад

Fantastic video thanks again Rado 👍🇬🇧

@dirtniron 4 года назад

Glad you enjoyed it Rich!

@tomatoknuckles 4 года назад

Looks amazing 👌

@dirtniron 4 года назад

thanks, glad you like it!

@chasemarsh125 4 года назад

Nice! Been waiting for this one! 🤘

@dirtniron 4 года назад

thanks Chase, glad you like it!

@ridehistori6229 4 года назад

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

@dirtniron 4 года назад

Awesome! Thank you!

@krp6147 4 года назад

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

@dirtniron 4 года назад

Thanks 👍

@ktmkeith13 4 года назад

Nice build ! Looks awsome

@dirtniron 4 года назад

I'm glad you like it

@jjmckay6man1 4 года назад

Beautiful Engine build Rado!

@dirtniron 4 года назад

Thank you very much!

@recipe1973 2 года назад

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

@user-qb4xr6ff9y 4 года назад

Great video man 👍🏾

@dirtniron 4 года назад

Glad you enjoyed

@robertwoods2505 2 года назад

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

@dirtniron 2 года назад

Thank you Robert! Cheers!

@FIDDYgg 4 года назад

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 4 года назад

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 3 года назад

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

@GNX157 3 года назад

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.

@dragoslavpetrovic3616 4 года назад

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

@dirtniron 4 года назад

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

@dragoslavpetrovic3616 4 года назад

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

@lanesherman9075 4 года назад

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

@dirtniron 4 года назад

Cool, glad you like it!

@petertoridechannel9361 4 года назад

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

@dirtniron 4 года назад

Right on!

@eschrader 2 года назад

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 Год назад

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.

@endurol8888 4 года назад

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 4 года назад

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

@Han-vq5qs 4 года назад

Do you race thats crazy your doing a full rebuild already

@samsti7680 3 года назад

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

@dirtniron 3 года назад

haha, Brad was excited too, inside ;)

@zardportugal 4 года назад

Beautiful.

@dirtniron 4 года назад

Thank you! Cheers!

@vince5946 4 года назад

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 4 года назад

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

@DmDetails 4 года назад

Good stuff Rado!

@dirtniron 4 года назад

Glad you enjoyed it, Thanks!

@yoansanchez7175 2 года назад

Wow bro nice and super Good jop

@CountryKidProductions 4 года назад

Looks great!!!

@dirtniron 4 года назад

Thanks!!

@CountryKidProductions 4 года назад

Dirt N Iron no problem!

@jimmychandra6469 4 года назад

No rubber hammer, hitting the bearing, nice.

@vince5946 3 года назад

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 3 года назад

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

@brad5664 3 года назад

thanks vince

@codycallaway2911 4 года назад

Very nice.

@dirtniron 4 года назад

Thank you! Cheers!

@patlanrusdi1483 4 года назад

Its amazing.!

@dirtniron 4 года назад

thanks!

@patlanrusdi1483 4 года назад

@@dirtniron you are welcome...😂🙏🇮🇩

@gladiadormotospecascromotx692 4 года назад

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

@lukethesheppard 4 года назад

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 4 года назад

haha, glad you like it Luke! ;)

@driver8438 3 года назад

As an engine builder I really admire brad

@brad5664 3 года назад

Thanks Ken

@driver8438 3 года назад

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 3 года назад

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

@brad5664 3 года назад

@@haitzyice thanks man

@Budivedder 4 года назад

Nice 2 stroke engine

@dirtniron 4 года назад

Thank you!

@scottmeredith8951 4 года назад

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 4 года назад

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

@metrolakes9109 4 года назад

you guys need one of my engine stands!!

@dirtniron 4 года назад

Send the link, ill check it out

@metrolakes9109 4 года назад

@@dirtniron ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-MFSK1MedJHs.html

@michaelbarnato4220 4 года назад

❤️macanic

@matty8761 4 года назад

wow nice.

@dirtniron 4 года назад

Thank you! Cheers!

@bryanslittlegarage5724 4 года назад

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

@dirtniron 4 года назад

Thanks bro, glad you like it!

@nastysoda9212 5 месяцев назад

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

@garasioffroad5432 4 года назад

nice i like this... from indonesia

@dirtniron 4 года назад

thanks!

@dakotaha3250 3 года назад

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

@brandonbladen4691 4 года назад

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

@dirtniron 4 года назад

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

@brandonbladen4691 4 года назад

How much for the wheels and PC pipe?

@Community-Action 4 года назад

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

@willgreene3649 4 года назад

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

@dmxracr9202 3 года назад

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

@sambuvca22 3 года назад

skojo3e hack

@TroNPopz209 3 года назад

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

@brad5664 3 года назад

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

@imagri1 11 месяцев назад

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 11 месяцев назад

Beautiful work BTW

@shokrefumi 4 года назад

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

@dirtniron 4 года назад

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

@drnyes 4 года назад

Nice 👍

@dirtniron 4 года назад

Thanks ✌

@fredflintstone9449 4 года назад

Glad ya know what your doing dude 😂😎😷

@dirtniron 4 года назад

thanks Fred ;)

@jenslaursen1 4 года назад

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 4 года назад

thanks man, yea I have it on wrong side

@joaowerneck3297 4 года назад

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 4 года назад

Thanks 👍 appreciate it!

@omarvillegas7161 2 года назад

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

@dirtniron 2 года назад

its called cerakote

@HERISJOGJA 4 года назад

Yeah

@justin3949 3 года назад

I wish I had this kind of motorcycle🤦🏼‍♂️

@nicholsvavak313 4 года назад

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 4 года назад

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

@f64ecc 4 года назад

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

@dirtniron 4 года назад

you bet!

@neliaagan9088 3 года назад

Idol

@jameswhiteman2337 3 года назад

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 3 года назад

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

@jameswhiteman2337 3 года назад

@@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

@Cereliabilqis 4 года назад

🤘

@rcf3773 3 года назад

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 3 года назад

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

@jakeday4105 4 года назад

waddup with super excited? overuse!!!!

@dirtniron 4 года назад

Shall i say stoked instead? 😉

@Ocgt 4 года назад

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

@Ocgt 4 года назад

Money *

@dirtniron 4 года назад

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..

@kyletracey5819 4 года назад

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 4 года назад

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 4 года назад

@@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

@bubaa1218 4 года назад

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

@dirtniron 4 года назад

which O-ring?

@bubaa1218 4 года назад

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

@sekte_sesat 4 года назад

2 stroke is the best..😄

@zmanel 3 года назад

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

@dirtniron 3 года назад

thanks Pedro, it is burnt bronze

@zmanel 3 года назад

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

@aesquivelful 4 года назад

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 4 года назад

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

@marina3060 4 года назад

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

@Smiling_mike 4 года назад

VForce!

@hitheshkumar4663 4 года назад

Eagerly waiting to hear d sound of 2stroke

@dirtniron 4 года назад

me too!

@marun8181 4 года назад

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

@marun8181 4 года назад

Plz bro say

@dirtniron 4 года назад

www.rockymountainatvmc.com/ these guys have it all

@gardosejohncarlo5791 4 года назад

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

@dirtniron 4 года назад

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

@mikaswm1352 4 года назад

No No No why 9:45

@marina3060 4 года назад

Because dumb

@brannable 4 года назад

I agree with you. Too he bad do put piston without lubrication

@MatthiasVermeersch 4 года назад

The reed block spacer is not in the right place. It must be between the reed block and the cylinder. No way the bike will run good as it is now. No flow from the intake manifold to the reed block. Also measure the squish with those aftermarket paper gaskets. OEM has metal in it and are thicker, about 0.6mm

@dirtniron 4 года назад

thanks Matthias, we fixed that spacer already, it was a long day for us. appreciate the tip about the gasket

@MatthiasVermeersch 4 года назад

@@dirtniron The build looks amasing, very clean, nice porting and the cerakote and bolts kit finish it nice! If you want to change the flywheel, I think you will like the GYTR 8.4oz flywheel on it. It should come stock on the YZ250's because its exactly what the yz250 engine needs. good luck with the rest of the build!

@carlos_araujo________ 4 года назад

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

@paknapak6441 4 года назад

Do have CR 250

@markleto8551 3 года назад

What is the reason for pinging fasteners?

@mc9304 Год назад

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

@GNX157 3 года назад

Everyone okay with how they pressed the cases together? I thought there was a special tool that pulled the crank end thru the bearing. Seems like pressing the cases together using the bolts is going to push on that crank wrong and throw it out of balance.

@justinpeterson8754 4 года назад

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

@dirtniron 4 года назад

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

@Jellegerritsen 4 года назад

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

@johnhouston3681 4 года назад

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

@lindenphilippson 4 года назад

Always surprised nobody mentions its a Chinese rebuild kit

@brad5664 4 года назад

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 4 года назад

@@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 4 года назад

@@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 4 года назад

@@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 4 года назад

@@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.

@victoroneill4381 4 года назад

11.42 torqued them down without a torque wrench?? wow

@nick4506 3 года назад

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

@dirtniron 3 года назад

thanks for sharing

@juanma13555 3 года назад

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

@dirtniron 3 года назад

I am not sure I understand you

@juanma13555 3 года назад

@@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?

@bikedogtor1663 4 года назад

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

@dirtniron 4 года назад

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

@JohnDoe-du6yi 3 года назад

Where did you get your bolt kit?

@dirtniron 3 года назад

its from specbolts

@JohnDoe-du6yi 3 года назад

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?