DIRT BIKE ENGINE SECRETS - How to build ANY dirt bike engine like a pro!

[@MXSkillShack]

Thank you ALL for the views, comments, SHARES, and support! _Best of luck to our members on winning this episode's Fastway foot peg giveaway!_ You can get signed-up HERE: www.mxskillshack.com/category/all-products YOU GUYS ARE THE SH*T!! -Charles & Tony // MXSS

[@Dirt_Bike_Dave]

Good Morning Boys 🖐 I am just over hear marveling at how Uncle Tony keeps his workspace so clean and organized, while I am looking at my work bench that looks like a bomb went off.💣🤣 lots of good tips here. I am not saying I have put a shift fork on wrong but I know it happens.🤦‍♂

[@MXSkillShack]

Haha! What’s that saying? “cleanliness is next to godliness”?? On the forks, it happens, ha ha! (we definitely have)

[@MXSkillShack]

Dirt Bike Dave! Appreciate the compliments buddy. We keep it clean! However there are times when the bomb goes boom for sure. Makes us itchy. Tony // MXSS

[@nicks2wheelchannel920]

I just put together my YZ bottom end the day before video came out and i do have the Factory Wrench transmission jig that made the job easier. Cant wait to see this bike done. It is killer so far guys.

[@MXSkillShack]

That’s bad ass, Nick! You’re about to be ripping 💪

[@MXSkillShack]

Yes Nick! That tools helps mega. I personally need to remember to flip the cases opposite what I'm used to in order to use it. I always start RH case down and the tool reminds me. WE appreciate you hanging with us and the support! Have you signed up at the SHACK to get in on this badboy (and others to follow)? Tony // MXSS

[@paulbudford]

That is a really cool trick with the heated socket Tony. Saves cooking the bearing. 👍 Great video as always. 👌

[@MXSkillShack]

😉 thank you

[@MXSkillShack]

Thanks Paul!! It's neat. Tony // MXSS

[@jameshodge6731]

Another great vid guys. All the tech,assembly tips,tricks .We the people are grateful for this. Thank you and cant wait till the next episode. 🤟

[@MXSkillShack]

Appreciate you, JH 🙏

[@MXSkillShack]

Thank you James! We appreciate you taking the time to watch. Tony // MXSS

[@ReelLyferOS]

I have a 96 yz250 roller and I would like to donate it to mx skill shack I’d be honored if you’d accept this token of my appreciation I’ve learned a ton since watching 🤝

[@MXSkillShack]

Thanks for blasting us here and all the other channel! We are grateful, and left you a more thorough reply and contact information below your other comment. Thanks for watching!

[@mikehudgens7007]

Wow I love the heated socket trick on the crank bearing A ++ But not surprised with the skills that Uncle Tony - Charles and Skillshack bring to these demonstrations Every video I pick up a trick ,🏁 thank you for all you do for the off road riders out there guys 👍🏁

[@niconine268]

Damn you guys are killing it on this channel. Master craftsman

[@MXSkillShack]

Much appreciated! Thanks for spending your time with us. Tony // MXSS

[@albertking7012]

Sweet, another video today! I've been trying to finish this one all day but been out of town for a couple weeks working so needed to tend to things here around the house. You guys run such a clean ship around the shop. Highly impressive! Loved the tricks especially the hot sockets. Makes total sense, seen that kind of thing working on aircraft in the Navy. Yeah, looks way easier then manhandling a crank puller putting the pressure it does on the cases. Man those gears are so clean....never done a tranny, so what I've been playin around with will be my first, as long as there's no love it's ok?🤣seriously though that will be one epic bike when you guys are finished, there's going to be one lucky Shacker!! I had a trans story but this is already too long. Guys take care and have a great weekend 🤙

[@MXSkillShack]

Albert, thanks for always taking the deep dive with your comments! We enjoy reading them and enjoy having you as well. Also, don’t let any Trannies put any “pressure on your cases”!!!

[@smytree]

Very helpful and informative, Thanks fellas. I have a few episodes to catch up on while waiting for the next. Cheers!

[@MXSkillShack]

We hope you enjoy them! as new videos drop, we like to put the next consecutive episode in the car at the end of each video. Hope that helps! And thank you for watching and hanging with us

[@mikehudgens7007]

Great great video - skillshack aka Charles and Uncle Tony nailed it as always and I need aome new foot pegs 😂 love the heated socket trick on the main bearings ❤ thank you dor all you guys for us dirt riders !!

[@MXSkillShack]

You’re gunna love the new Fastways! Thanks for spending time with us every weekend, Mikey

[@MXSkillShack]

Yewww Hudgy! Appreciate you pal. Tony // MXSS

[@coloradodirtbike5930]

Dude those pegs are rad! I never seen those ones yet, lol the humor too was great 😂. The bikes so close to being done almost, this is sick!

[@MXSkillShack]

We freaking love the pegs too! Definitely rings a little bit of modern into the old girl.😍

[@michaellechnarjr6391]

Thanks. I spit my coffee out when you described the peg dimensions. 😂 I hope I win, but I’d rather save my luck for the bike.

[@MXSkillShack]

Haha! The visual…. 😅 Dude, everybody who is in on the bikes is automatically again for the pegs as well. Bonus! Thanks for hanging…wait, there’s another visual…

[@MXSkillShack]

Oh snap! Well at least I’ve got the needle… Tony // MXSS

[@kaseysulheim4616]

You guys are rad for doing these vids, new sub, stoked🤙🏽

[@MXSkillShack]

Thank you for checking it out and for subscribing! Many more to come. Not sure you caught it in the video, but we're giving this bike away to one of our members once we close the window for it. Please find the details here if you'd like to support our efforts. www.mxskillshack.com/product-page/1997-yamaha-yz125-shop-this-build Tony // MXSS

[@rclmxshift]

Have you guys ever heard of QPQ Coating (Quinch Polich Quinch). We use it on Stainless and 4140 L-80 parts here for anti-galling purposes. I'm not sure if this coating would work for any parts applications but might be worth looking into. I know it's pretty cheap process and the coating is black. It does bring the metal hardness up as well.

[@MXSkillShack]

Super interesting. I personally (Charles) have not. We’ll have to look into it & thank you fir watching/ the cool science tip 🙌

[@phatheadracingmx]

Steel sleeve bore, spray with penetrating oil before soap and after soap and water wash. Wipe excess and oil the bore. Thats my procedure. I would seal it up and keep it away from moisture unless you install right away.

[@facundopereyra8455]

22:11 how do you fix a crankcase that is bent or have light?? i think mine is bent damn it

[@MXSkillShack]

You'll need to surface the case halves on a surface plate to see where the warp is. If its significant you may need new. Tony // MXSS

[@facundopereyra8455]

@@MXSkillShack i have a 0.002 light near the crankshaft area. Damn it :C

[@mikehudgens7007]

Watching for the 2nd time and forgot to mention my transmission story back in the early 90s i bought a project 1980 Yamaha it 125 that would not shift 😮 pulled it apart found second gear ⚙️ was broken 💔 and got a new gear ⚙️ put it together and shifted and ran great here i put a shim in the wrong place and bike took off backwards lol had to pull apart again but only after trying to ride it backwards for a couple days lol 😂

[@MXSkillShack]

Can’t let some tranny get the best of you! Especially in 2024 😆 thanks for being thorough!

[@MXSkillShack]

Ah Mike, NOOO! I have a similar story involving at 2003 CR250, but mine doesn't involve reverse... Tony // MXSS

[@mikehudgens7007]

@@MXSkillShack well your keeping me in suspense with your transmission story Uncle T - let us know the details 🏁

[@DeCalWorksMX]

Looking good!

[@MXSkillShack]

Thanks, RJ!

[@dylancrow7919]

My worst transmission story. I did a complete rebuild on my bike. Replaced all the normal stuff for a top and bottom rebuild. I obsessed over every little detail for a while as parts would slowly come in the mail. Once I got everything finished and went to put the front sprocket on, I suddenly remembered than the splines on the shaft were worn and I meant to replace that shaft and completely forgot about it. The sprocket still had decent engagement, but I’ll bet that the splines on the shaft will be the first thing to fail as I put more hours on the bike. So next time I do a top end, I’m probably going to have to go into the bottom end again.

[@MXSkillShack]

Hey Dylan! Thanks for sharing that story. Tony // MXSS

[@phatheadracingmx]

🎂 PHAT kids love YZ125s ♥️

[@MXSkillShack]

Hella PHAT!!

[@tomatoknuckles]

Have a quick one for you 2 gurus, i have an 01 rm250 that I'm working on but the kick-start is missing. Is there any other year that will fit? Because anything listed for an 01 is stupid money. Any help much appreciated 👊

[@MXSkillShack]

Hi dude! Charles here... I believe some RMZ kickers will fit, but be very tall. Also, any good, used RM kicker will fit. I did see some new ones on eBay too, for cheap! Hope that helps!

[@tomatoknuckles]

@MXSkillShack Thanks Charles, much appreciated dude 👊

[@PremixandPedals]

You guys should reach out to Metzler and see of they will sponsor you. I can see the two of you wearing shirts with the Metzler logo on it! Lol!

[@MXSkillShack]

That was tires, yeah? -C

[@MXSkillShack]

Yo Todd! Ha, but text DUNLOP to 208….. Tony // MXSS

[@TranquilityforyourSoul]

@@MXSkillShack yup, tires! They're logo is an elephant!!! LOL!!!

[@TranquilityforyourSoul]

@@MXSkillShack isn't that the same number I texted Maxima to?

[@ScottThomas-x1b]

What engine stand do you guys use

[@MXSkillShack]

My stand is a Metaltek. It's one of my favorite tools. Reach out at the contact link on our site if you'd like to get your hands on one. Appreciate you watching! Be sure to sign up if you haven't. Tony // MXSS

[@ScottThomas-x1b]

@MXSkillShack I'd like to purchase a engine stand are they available

[@MXSkillShack]

Please send a message through the contact link at the bottom of any page on MXSKILLSHACK.com. Provide your contact details and I will personally reach out. Tony

[@tylerjamesgillismusic4782]

Hopefully y’all are having a great week guys. The motor is coming together nice it looks and that tranny is gonna super slick banging gears with that puppy screaming! Unfortunately but fortunately lol I do not have a crazy or good or bad tranny story to share. So I’m hoping to read in the comments someone else’s rad story lol 😂 much love 🤘

[@MXSkillShack]

Hahahahaha we always enjoy reading Tyler’s comments 😁 PS: spend more time at truckstop and you’ll have a tranny story soon enough 😂

[@MXSkillShack]

Tyler... Red jacket, green jacket. Who gives a _____! Tony // MXSS

[@bugs7425]

Shouldn’t the case bolts be installed dry without grease, as the torque settings are for dry assembly, and grease will reduce friction and increase the actual torque applied to the bolt, which could strip the case threads??

[@MXSkillShack]

This was common practice that I learned as a race mechanic. Many things were done NOT by the service manual, but were HELLA cool and much better for equipment. Engine and chassis buildng all fasteners were greased. One thing I noticed early on is that it was easier to get to a precise torque with a lubricated fastener then dry. You ever notice that creeking in triple clamp bolts when you loosen them after a while even if you know they were torqued? Now put some grease on the bolts and try. So much better and no binding. Some food for thought.

[@Bryski772]

Morning homeboys great stuff keep up the big words Charles I’ll have my wife translate because I be a bonehead. You guys have a awesome weekend

[@MXSkillShack]

Copious! 😝 Big thanks, Bry!

[@MXSkillShack]

Thank you Bryan! I need an interpreter…. “Wtf did he say?!” Tony // MXSS

[@dylancrow7919]

With magnetic drain plugs, has anyone ever heard of a magnet coming out of its home and ruining a transmission? I had an aluminum dipstick cap drop the pressed steel dip stick into a frame on a DRZ. Since I saw that I’ve been afraid of using magnetic drain plugs.

[@MXSkillShack]

I have heard of that happening. Always check them. That is a crappy deal on the DRZ. Tony // MXSS

[@jz64]

Good video for learning. Quit screwing around on that motor 😂😂😂

[@MXSkillShack]

Glad to hear, now stop disrupting the class 🤣😜 Tony // MXSS

[@mareksumguy1887]

Youre suppose to use anaerobic sealant between the case halves... not RTV!

[@MXSkillShack]

Why are you yelling?…. Threebond 1211 is something special. I’ve used it for 2 decades on engine cases and many other dirt bike “things”. It’s the 💩. Kawasaki sells it with their own p/n. Are you familiar with it? Personally I don’t like dealing with sealants that harden on center cases. Some of those can be a pain to cleanup. Tony // MXSS

[@mareksumguy1887]

@@MXSkillShack ?? Clearly not yelling.

[@MXSkillShack]

But you were excited about something... You used an exclamation point and it is not appreciated. Here we are offering such a kindness to the moto community and here you are telling us what to do. Oh I almost forgot. Have you signed up for your chance to win this bike with "RTV" center case sealant? Maybe pickup a tube 1211 and try for yourself from our amazon link PROVIDED below? As mentioned its pretty neat. Tony

[@mareksumguy1887]

@@MXSkillShack ah quit your whining. There was nothing wrong with my comment.

[@MXSkillShack]

Ah man I'm hurt. There was also nothing right with it... Maybe explain to everyone why YOU prefer that sealant over another you've maybe never used?

[@Pompomgrenade]

Transgender motorcycle gearbox... Super slick 👌

[@MXSkillShack]

Um, that's offensive 😂. HELLASLICK!

[@calebhubbard8685]

You guys are so stubborn that you rather put your cases together with a hammer than use a crank puller....smh. usually the crank goes out of true when you do that. Not to mention that freezing the crank sure does to. Not always but usually. But props to you guys your stuff looks trick!

[@MXSkillShack]

Hi Caleb. Much appreciated feedback! You know sometimes expressing/showcasing a different approach doesn’t always go to plan. The puller certainly does have a place and makes it a breeze. The bearings should still be expanded to do that or you put a lot of side load on the inner race. In a normal case when we’re not trying to explain/teach, which takes some time, and this case the crank temp increased heaps and didn’t allow for an easy case drop. Usually that process needs to be done in a minute or less. Have bearings heating at same time, left case gasket prepped, and transmission intact… Other option was a plastic mallet, which I’ve used on many engines, with “light taps.” Not everyone will have a crank puller, but everyone should have a plastic and rubber mallet. Interesting on the crank points. I’d have to disagree, but we do appreciate the input. Thanks for the compliment! We’re pretty stoked on it too, but really it’s not ours, it’s yours, we just get to build it!