How to rebuild 4 stroke engine on a dirt bike - RMZ450 build

[@miliconngrin]

Wow! such a skilled confident mechanic

[@brad5664]

thank you

[@silasbryant1111]

@@brad5664 NJ

[@outlaw7x77]

That was really impressive to watch someone who so obviously knows what they're doing...he could do it blindfolded! WOW!!!

[@emils6734]

Rebuilding my Aprilia sx 50 engine right now and gotta say that four strokes look like hell compared to 2 strokes

[@dirtniron]

yea, couple more bolts on 4stroke ;)

[@Kyanvs]

moped gang

[@joshua8362]

I have an aprilia sx 50 as well

[@gulag_dt]

Plus a 50cc engine is a bit more simple then a 125 because 50cc doesn't have power valves

[@perth7930]

Or you’re just dumb

[@rosscollier3992]

Loved this video, really interesting as someone who is wanting to learn more about the 4 stroke engine! The guy who did it is so talented! Cheers guys

[@dirtniron]

Glad you enjoyed it!

[@owl1873]

Im a nuby to the dirt bike world but it has become apparent me that I have stumbled upon some legitimate content here. Feeling Blessed.👍

[@dirtniron]

Welcome aboard Mark, glad you see it that way! btw, you will love dirt biking ;)

[@timbaggett9825]

This video was sick, I know both Jay and Brad and they not only build awesome bikes, but they are great people too.

[@dirtniron]

agree 100%

[@aaronzaitz5676]

Awesome vid rado i think its great that J and brad are such talented mechanics willing to teach you everything u need to know when it comes to your bikes I love it man keep it up

[@dirtniron]

Thanks Aaron, yea they are great! Jay has been great friend since the day we first met.

[@brokebikemtb4448]

Rado your very fortunate to have jay as a friend he is a legend....that motors value just went up about 2k because brad built it at jay clarks house.....brad was right at home doing this.....you can tell he knows a thing or two about a thing or two.....while us amateurs study manuals ...brad is who we one day aspire to be....

[@brad5664]

Thanks for the Props ....Boss man

[@dirtniron]

yea, Jay is great guy, he really loves dirt bikes and the best part is that his heart is way bigger than his ego ;)

[@brokebikemtb4448]

@@dirtniron thats awesome of you to say..looking forward to the 450 vids keep up the great work...i been watching since you first got the old warehouse...take care man

[@twentyhundred3481]

Currently stripping my 13 rmz450 down to send out to this guy. Saw him all over your page and had to give him a shout when she finally quit on me after 200 + hours of supermoto riding.

[@dirtniron]

Right on man! Brad does great work 👍

[@dylangatzka2699]

I just got a 2013 rmz250 Sunday I love the bike rips and is easy to get comfortable on

[@dirtniron]

Cool man, congrats!

[@stevenl8687]

The skills this man has is amazing!

[@dirtniron]

Brad is the man!

[@danshealthylifestyle8443]

man this Mechanic is a beast. can tell he's old school for sure he doesn't even use those tusk tool for anything. Man I'm impressed thanks for the video

[@dirtniron]

yea, he is very good! @parapros on instagram

[@spartan0722]

These time lapse vids are really awesome! So many ch can be learned in a short period of time! You dudes brighten my day every time I watch Dirt and Iron! Stay Moto Vated!!! Do y’all sell t shirts? lol! Thanks again!

[@spartan0722]

Yes, and shout to Dirt Bike TV as well! I want to be you guys when I grow up! Though I’m 51 so I guess I’m already grown up, lol! I still want to be like you guys when I grow up though :)

[@dirtniron]

haha, you are funny! Glad you like the videos, appreciate it!

[@Mackenzie.Grant95]

Great job Rado! The RMZ engine looks really good with low wear for 120+ hours.... That diesel engine oil you use seems to do a excellent job! regardless these guys did a great job on your motor! should pull very strong!!

[@dirtniron]

Thanks Mackenzie! She might pull little too much now ;)

[@Mackenzie.Grant95]

@@dirtniron maybe but you can just hold on tighter;) lol

[@jaivenm1973]

These videos make me have so much respect for my mechanic... without him I’d be SOL... great job man!

[@dirtniron]

glad you like it Jaiven, Brad knows his stuff!

[@talon0863]

@ 19:00 That's Rado singing. Pretty good!

[@dirtniron]

Haha, i wish ;)

[@rabiit1973306]

@@dirtniron what is the name of the song???

[@vacancyforlife]

A true professional.

[@jjmckay6man1]

Awesome video and a great mechanic! Thank you for sharing!

[@Teamloco1853]

Superior technician loving the videos

[@Magillasgarage]

Wow!. That looks great. And that guy does great fast work.

[@dirtniron]

yea, he knows his stuff! Thanks

[@brad5664]

@@dirtniron thanks guys

[@tomatoknuckles]

Even 4 hours is impressive wow. Master at his craft.. They do seem a bit easier to do compared to a crf. Great video.

[@dirtniron]

thanks man, glad you like it!

[@brad5664]

Hey Rado the video came out very good ...this is Brad the one that did the motor...lol but that was awesome

[@dirtniron]

Hey Brad, good to see you here and glad you like the video! you did great job, thanks again!

[@stacksmasher]

Hello Brad! Awesome video, do you rebuild engines for the public? I am at about 120hrs on my 2016 450X and am looking to have it rebuilt.

[@brad5664]

@@stacksmasher yes sir .. just DM me and ill give you info thyx

[@stacksmasher]

@@brad5664 Looks like your account does not allow DM ; (

[@gusthebus2542]

I'm also interested in a engine rebuild

[@benjibanks7894]

Cool video Rado. I wish I had them skills.

[@dirtniron]

Brad builds 2-4 engine a week, he is pretty good ;)

[@goproguy1512]

Brads my mechanic does amazing work!!!

[@dirtniron]

he sure does!

[@mikejuce]

Where is he based out of? I’m in Fresno and after seeing his work I would like to use his service. Someone who actually knows what he’s doing and seemingly cares about the build. Awesome

[@3dwezzy740]

handy manny ahh hammer i din see a case splitter used this man is a legends

[@KincadePavich]

Are there no torque specifications for most of these bolts? Awesome video. I've got an opportunity at a really cheap '07 RMZ450 with a seized motor. I've never rebuilt a 4 stroke, but I'm motivated to try.

[@dirtniron]

yes there are, we followed quite a few. good luck with your project!

[@NirHason]

This guy is a pro! great video! detailed where it should be. Thanks for sharing with us Rado :)

[@dirtniron]

thanks Nir! I got new dslr, did you notice the quality was little better? I got canon 80d now

[@NirHason]

@@dirtniron I didn't really, the quality is awesome though. The thing that really gives a better quality is the lens ;) What mic was used?

[@dirtniron]

i used external Rode shotgun (micro) but it might not be all the way in.. I noticed late.. so I am not really sure if it was built in camera mic or my external. I am using same STM lense as with t5i, it is sharper now and autofocus works much better too.

[@utahenduro4808]

Incredible 4 stroke rebuild, everytime you ride one

[@dirtniron]

every other time as long as you do your oil changes often ;)

[@Aabbcczzxxcc]

9:28 why don't you use ice for cooling bearing and easy install them? Or maybe compressed spray air like air duster

[@dirtniron]

we heated the cases and the bearing went right in, no issue at all

[@Aabbcczzxxcc]

got it. just asked about it cuz i am going to do same with my engine soon. thx for video.

[@brad5664]

@@Aabbcczzxxcc with heating the case the bearings just fall in i was only using a hammer because its HOT but they fall right in

[@nicown1337]

Nice ! Very good mechanic

[@dirtniron]

thanks bro!

[@DisruptiveUnicorn98k]

What songs did you use at the end I can't find them .

[@dirtniron]

sorry man, I dont remember, cant you do the search to find out ?

[@ZygmuntKiliszewski]

Good job, congratulations 👌.

[@OBSBryce]

Awesome vid rado! Can’t wait to hit cahuilla with ya when this beast is done!

[@dirtniron]

hopefully soon! ;)

[@stantheman5005]

Skills hammer good tool

[@derrickfauber9633]

Awesome set of skills. What a talent. 👍🏻

[@dirtniron]

Thank you! Cheers!

[@martinruiz7475]

Great job guys

[@dirtniron]

thanks Martin!

[@brad5664]

well since so many people are asking about the cylinder hone we did the hone is called a Brush Hone It's perfect for deburring and deglazing engine cylinder walls its made just for Nikasil cylinders ....

[@davidjo997]

Hey Brad quick question, whats your opinion on the idea thst this type of hone ruins the thin niksil coating? About to put my first top end on my 19 250 xc with 100 hours, cross hatching should be fine, would you recommend honing anyway to ensure proper ring seating?

[@brad5664]

@@davidjo997 ya if you have hone thats made for nikasil if not you can use green scotch bright pad and contact cleaner ..you want to get the carbon build up and deglazing the cylinder that will for sure help with new ring seating

[@zardportugal]

Master work.

[@alexsgarage01]

Great video

[@BrokenSprocket]

Nice video Rado the perfect video to watch when eating breakfast lol...

[@dirtniron]

What did you have for breakfast? Just curious what is normal breakfast in australia ;)

[@BrokenSprocket]

@@dirtniron Vegemite on toast of course lol...

[@dirtniron]

I had to google it, looks delicious 😉

[@yourselfdotcomlol]

I am currently doing this exact engine and kit. This video serves as a great reference. Would love to pick that guys brain building it. Clearly not his first rodeo. Hahahaha

[@dirtniron]

cool, glad you found it helpful!

[@jcs480able]

Very informative.

[@timopenttinen3020]

Professional Work :) Very Nice !

[@brianpalma8491]

Beautiful engine. Very good job🤩🤩

[@G0R4Nn]

Awesome video rado! I'm rebuilding my rmz250 atm, this is like a guide for me now haha

[@dirtniron]

Cool bro, glad it helps ;)

[@Bee-fr7zk]

I was rebuilding my engine today slapped the top piece where those arms go up and down but it won’t turn over unless it’s off

[@webmasterguru7799]

If i tried to rebuild this, there would be a box of bolts and bearings left over, and it would not run🤣 Great job👍❤

[@dirtniron]

Thanks 👍

[@philipstach5948]

i always hate putting the timing chain back on :D nice video!

[@NirHason]

Must go to sleep but I had to click and the like button. I'll watch it in the morning :P

[@dirtniron]

look forward to hear your feedback! nite~

[@ghostfromdeadmenatseawilli2248]

Wish i could do that sucks was looking frord to ridening. I keep you up to date

[@mildaudiophile3879]

Can wait to hear that thing

[@kinglucci5352]

Brad a fuc'n LEGEND !!!!

[@RWWRENTAL]

do you guys have a shop I can send an engine to?

[@dirtniron]

get in touch with @parapros in Instagram, thats Brad who did this engine

[@TommyElmz]

What was that part at 6.00 thank you

[@shiresquinton46]

Nice one Rado! Looking forward to seeing how that bad boy performs.

[@dirtniron]

thanks bro !

[@bikemancody2752]

I use wrench rabbit kits also. However you skipped out on installing all the other bearings other than the crank?? Why?

[@dirtniron]

i am not sure now.. I think the oem were still pretty good.. dont remember..

[@reaptheheat5853]

Jay, looking good

[@dirtniron]

:) he is staying in the shape, riding like 4 days a week, i wish I can ride that much

[@beni8978]

Love the video. Really enjoyed ! A yz450 is coming soon to me

[@chrisreed2755]

Good electric torque wrench 😳

[@Wathappn2u]

What would cause coolant to come out of the over flo when it warms up?

[@bencetullner1964]

Awesome build! I have 2013 rmz 250 and I want to remove the judder spring from the stock clutch, but its not clear to me how should i do it. Should I remove the judder spring, judder spring washer and the smaller friction plate and add a normal friction plate?

[@haitzyice]

Still watching your old builds Rado! This mechanic Brad you have working on your stuff for you and Jay is awesome. I wish he had a KZbin channel also

[@dirtniron]

That would be cool! Brad can share a lot of great experience. Thanks for watching bro

[@josefranciscoperniasanchez7824]

RMZ 250 FOREVER

[@dirtniron]

i just got one too!

[@austinjoppa9142]

Very awesome video, can you do a rm250 engine?

[@mikelwmc]

You don't check run-out on that hot rods crank out of the box?

[@mxcollin95]

So would Brad be available to do some engine work? Could someone get ahold of him through Jay?

[@dirtniron]

yes, message Brad on Instagram @parapros

[@stevemcevoy6185]

Tighten those casing bolts opposite to each other

[@cryptoinvertor]

great video i want to do that to my 250 some day and hope to learn a lot :)

[@DennZn385i]

hey can you say me which tool i need for the flywheel from the ignition m24x1,5 or m28x1.5 Greets from Germany

[@Wide000]

Great video! :)

[@joee8795]

Really wish you would have shown the *carbon cleaning* method, otherwise great video 🤘🏻

[@dirtniron]

We used air buffing tool

[@joee8795]

@@dirtniron I only said that because I am currently in the middle of rebuilding my 09 RMZ450’s engine right now and cleaning the Carbon off the Piston, Head & Valves are the last thing I need to do before I can put it all back together 🤞🏻

[@hencetirta7633]

mR dirt on . what a diferent cam chain timing . between kxf250 and rmz250. .2014

[@PHATT13_DADDY]

Love the video great bunch of information for noobs like me wondering what a rough price for all the required parts cost you in the end

[@dirtniron]

Glad it was helpful! I went all out so its was little more expensive but i guess you can rebuild it around $1500

[@JakubKlubkoSmejkal]

oh dear, I was hoping to see kick idle gear removal and instalation as I'm now having issues with it and you skipped it :-| Do you happen to have that piece somewhere else?

[@dirtniron]

sorry Jakub, I dont think I have that on the video.

[@JakubKlubkoSmejkal]

@@dirtniron that's a pity. Do you remember if your gear had a shaft pressed into it that rotating inside the case or it has brass insert an it is rotating on an insert that is pressed into case? My issue: thumpertalk.com/forums/topic/1329525-seized-kick-idle-gear/?tab=comments#comment-15449144

[@michaelosullivan8288]

That is sick and wish raptor 250 if you guys can try work out on Yamaha raptor 250 that be awesome to see next time if someone asked you if can rebuild some of 2 wheelers/quad that be nice to help out to look after the engines

[@dirtniron]

thanks Mike, lets see what we can do.. but we are mostly 2 wheels guys

[@michaelosullivan8288]

@@dirtniron Ive lived in Aussie area

[@ghostfromdeadmenatseawilli2248]

Its case bye.little spriot. Can you weld

[@wallefersouza4180]

Here in brazil we put these 450 pistons on national motorcycles.generating around 55 hp.surpassing those imported on the tracks

[@dirtniron]

cool!

[@Velcrochicken1]

I can't help but think 120 hours requiring a full top and bottom rebuild is crazy. I'd be doing one every 3 months.

[@victorcordova8338]

Chicken Mac i have a 2015 yz250f with 316hrs. I’ve only put one top end in and replaced all valves w/ adjustments. I ride and race enduro, still going strong

[@Velcrochicken1]

@@victorcordova8338 yeah that's more like what I'd expect👍

[@dirtniron]

it was still in decent shape, it would run longer for sure. Clutch was in worst shape but the top and bottom could do more. But since I am doing this build on the channel, it was a good time to go thru everything

[@Velcrochicken1]

@@dirtniron fair enough makes sense.

[@Sergio-ih6lk]

Did he check the ring end Gap or did I miss that. maybe lap the valves in or a valve job

[@brad5664]

yes is did check ring gap it was fast i didnt even see it ...and never lap in ti valves you would ruin them ..

[@Amateurs2Roues]

He has gold hands !

[@RugerNuger]

Did you have to have the crank balanced ??

[@dirtniron]

no, out of the box worked great

[@RugerNuger]

@@dirtniron awesome love the vids going to do this to my rmz450 now

[@xaviefhunt6691]

Was it stock motor before?

[@dirtniron]

yes

[@beovoznyuk5820]

What's the name of that last song? Good video just did my 2012 rmz 450. Thank you

[@dirtniron]

sorry, dont remember

[@tjracing3243]

Would this build pass the AMA Motorcross rules?

[@dirtniron]

I dont see why not

[@bijornful]

How can I get in touch with brad? I have a 2015 RMZ 450 I want to get rebuilt.

[@TS50ER]

Why don't 4-strokes have a small-end bearing?

[@jamesmasanja1963]

Lovely from Tanzania 🇹🇿 would you help me to get some parts like block and Piston kit

[@evanwilliams2602]

I guess the crank just slides into the bearings? I was under impression you needed to used the puller tool.

[@dirtniron]

it depends how well you heat up those bearings..

[@brandonfontaine285]

Someone please give me the song name at 18:50

[@dennisnbrown]

What was your cleaning process? Didn’t show it

[@dirtniron]

here you go kzbin.info/www/bejne/a4C0qJuPZb6Mrpo

[@soraaoixxthebluesky]

Did u skim the head and cylinder block before installing it back?

[@dirtniron]

No, buff and clean

[@darylsanz1020]

Rmz 25O most likely the-same procedure only difference is the sizes? I wanted to buy 2nd hand rmz250 2014 model Id like to rebuild its engine same way you did. My poin it i want to know your exact kit for that haha

[@dirtniron]

should be very similar

[@TrippyBlue25]

How do you keep track of the bolts and screws

[@dirtniron]

ziplock bags and marker

[@969Factory]

Is it needed to use a hone for the cylinder when changing piston on a Sxf or other nicasiled cylinder? Or are there something else you can use that you have in your house?

[@dirtniron]

check other comments, Brad (the mechanic) explains what he did... its not really a honing

[@969Factory]

Dirt N Iron thx Will do, did check a bit but not all way! Guess I was one of those lazy ones on the internet today! Haha. Great video and thx again for answering 👌

[@Marvelfunfaqs]

Amazing, can you guys come to the east coast to my garage next? And put on some gloves!!! Lol

[@dirtniron]

let me talk to Jay ;)

[@ryansweeney1281]

No narrating? would like to have heard what the torque settings were, were to position the cams, how many links on the timing chain to line up?..........

[@dirtniron]

yea, that would be good.. we did that in our KTM and YZ videos..

[@andriss1234]

Really nice slogan! Stay moto vated! Can you offer t-shirt.

[@andriss1234]

Sorry, I found www.dirtniron.com/product-page/dirt-n-iron-moto-shirt

[@dirtniron]

cool bro, and check out this new design as well, Stay motovated is on the back: teespring.com/stores/dirt-n-iron thanks ! ;)

[@tonitodejesus8811]

Hey man I need help really bad I got ripped off and now have my engine in a box I need help to put it back together

[@dirtniron]

get in touch with @parapros on Instagram

[@REALITY_ONLY_PLEASE]

OK I learned some stuff. My first question is: How much is an engine rebuild? Because I can not do that!

[@kcfox3130]

wish you could find a video that explains it all on how to do, hard to follow this one especially when trying to line bits up & were every thing goes in correctly

[@qschool1]

Buy a manual or take pictures with your phone as your taking it apart