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Yamaha YZ250 & YZ250X Bottom End Rebuild | Part 2: Engine Assembly

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Yamaha YZ250 Engine Rebuild: www.rockymount...
This is part two in our series where we go through a complete bottom end engine rebuild on a Yamaha YZ250. The second part of this process includes reassembly of the engine, which is detailed here in this video. The steps shown here will be very similar for other late model Yamaha YZ250 and YZ250X bikes. Stay tuned for this series to see the complete engine disassembly and rebuild process.
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Yamaha YZ250 & YZ250X Bottom End Rebuild | Part 1: Engine Disassembly
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Опубликовано:

27 авг 2024

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Комментарии : 97

@dericnichols6804 3 года назад

Charles, I know I speak for many when I say "THANK YOU" for making this and your other videos. Without this video I wouldn't have done my own rebuild, You have a way of explaining the little details and the quality of your video is by far the best.

@rmatvmc 3 года назад

Thanks Deric! We try hard to make these videos good, so I'm glad it helped! -Charles

@redtobertshateshandles 2 года назад

Pretty cool channel. Free how to videos. Amazing 👏.

@GearinSuper 3 года назад

This is one of the best step by step rebuilds I have seen. It will be my go too. TY

@zbyh1980 7 месяцев назад

This is gold. Thanks for taking the time to make this video.

@rmatvmc 7 месяцев назад

It's our pleasure. Glad it was helpful!

@phillsmith5100 3 года назад

I’ve just done the gears today for the first time and you made it look easy, took about 10 times for me 😅

@shakiejake 2 года назад

I have ordered everything to rebuild my engine , I do have many car engines and top ends on 2 smokers , but not much bottom end , tho video has took all the worry’s away thank you

@loganflorida462 3 года назад

Keep them bottom end videos coming! I think we’d like to see some yfz content 💯

@vince5946 3 года назад

great content, this will come in very handy on my 04 YZ250 winter build.

@morley3810 2 года назад

I watched it with the sound turned down and I appreciate that you showed that it's important to put red loc-tite on all the bearings before final assembly lol (yes, sarcasm for those not sharp enough to pick up on that).

@rmatvmc 2 года назад

LOL

@ellenpicardi6767 2 года назад

After assembling the shift shaft we cycled through the gears. Sometimes didnt feel right. What are we doing wrong?

@jimbob12382 6 месяцев назад

Brilliant videos

@johnnymoe1989 3 месяца назад

Did you put the water pump gear in? I’m doing this for the first time and feel like I’m left with spare parts and am confused. Thanks for the help.

@carsnails 2 года назад

Great video. Thank you.

@95jersey 3 года назад

how can I hire this guy to rebuild my YZ this summer...

@Seryoga_77_ 3 года назад

After the two halves of the motor are pulled together, it is actually necessary to check whether the shafts are spinning. There was a case that all the bolts of the halves were tightened, and the shafts did not rotate. With a full screed of the halves, it is necessary to control their ability to rotate all the time.

@gasi9613 2 года назад

Nice skills !

@redtobertshateshandles 2 года назад

I'd file the grooves out of the clutch basket. They can give you a weird intermittent clutch slip problem if they're bad enough.. Great video though.

@ethanhering1309 4 месяца назад

Will red locktight work instead of blue?

@Joe-wy2bn 11 месяцев назад

I've got a feeling I might be doing this soon. I bought a yz250x with 120 hrs on it and it sounds a little "tappity tappy" from the bottom. Sounds like it makes a little crack or snap sound when I apply throttle with the clutch out. The foot pegs vibrate a little, but the bars don't, so I don't know...

@SolePompano 10 месяцев назад

Do it. Last thing you want is a blow up which will cost you more and complicate the rebuild. 120 hours is in the range where you’d want to do the rebuild anyway.

@benjaminsanabria5212 Год назад

Hey Rocky Mountain I just did a full rebuild on my 2007 yz bike is running nice but noticed antifreeze is coming out of radiator cap never saw this before please help

@BramVanhautte 2 года назад

How long do you have to keep the bearings in the freezer? I see you laid them out and then started heating the cases. Don't the bearings become bigger again which makes is a snugger fit?

@rmatvmc 2 года назад

Many people will leave them in the freezer overnight but a few fours should do the trick!

@redtobertshateshandles 2 года назад

No, they're freezing cold. They don't warm up that quickly.

@MrJeffharper47 Год назад

When did Fox Molder leave the X-files and start building dirt bikes?

@tim5618 2 года назад

The left part of my case won't go in with the puller but the right will when I pull it wirh the puller and at first I thought it was the transmission but I don't know now. What is my problem?

@mattbandarra9574 Год назад

Did you use locktite on every bolt and screw or just the ones you mentioned? Not sure if you used it off camera on some

@jimberry742 3 года назад

Outstanding...Thanks.

@AREA-51moto Год назад

A couple those torques numbers are way to high... better double check your manual for torque values , before you possibly strip out a of thread. Other than that, AWESOME video! Thank you so Much!

@William51115 2 года назад

Why is the torque in inch pounds sometimes and foot pounds other times? Is it a big deal that I torqued everything in inch pounds by accident?

@premiumdetail5349 2 года назад

Hello my bike stopped running , when I started back up (literally one kick no issue) it sound like something jumping inside and turned off 😞 carb was rebuilt and adjusted then this happened when I rode one day for about 45 mins

@jesseleonard1429 2 года назад

bottom end connecting rod bearing

@MountainManKm 2 года назад

If I have case gasket I just put it on and torque it down right?

@jesseleonard1429 2 года назад

no , you have to spit on it first

@MountainManKm 2 года назад

@@jesseleonard1429 😂 thank you

@PERTHSCOOTER07 3 года назад

Can the engine be fitted into the frame with the cylinder installed.

@primerecording2337 3 года назад

Yes

@AlexB-ts8oo 3 года назад

What did you guys use to clean the crank cases? Those came out looking fresh, almost looked like that new top end lol.

@lozadazx14 3 года назад

And a ktm too please !!!

@rmatvmc 3 года назад

A bottom end? Which KTM? We have some Husky 450 stuff that will be coming out soon! -Charles

@lozadazx14 3 года назад

@@rmatvmc 300 xc

@coloradodirtbike5930 3 года назад

@@rmatvmc how about a kx500 or a cr250 👍💯. Great video by the way.

@coloradodirtbike5930 3 года назад

@Jaedon Humphrey 👍 right on

@joebauer6752 3 года назад

he mentioned pin on shift drum is positioned top /right but he rotates in hand and installed it on bottom side...what is right??

@L0GANLS400 3 года назад

Need help finding all the bearings for the cases . how do I know the size and how many I need ?

@GodlyGreek5 Год назад

Hey mate hope you see this your video was awesome appeciate the effort to do it. there was a bearing with seal I didnt have it right spot lucky i could use your video for reference im a mechanic by trade but for a guide i enjoyed the video very well done. by anychance was this a yz250x? because i found minor differences on certian parts on my engine which is from a 2010 yz250.

@rmatvmc Год назад

Awesome, we're glad this video was useful in your rebuild! This bike is actually a 2009 YZ250 so that's funny there were differences. What did you notice?

@GodlyGreek5 Год назад

Stopper lever assembly the roller on mine was smaller and on my photos I took I noticed a collar like a U shape that went around the roller and my roller was smaller then yours. your one was big and you didnt put anything around it or behind it. the roller hits on the cam shift segment. thats all i can remember off the top of my head I think their was one more difference but ive forgotten stressfull day for me truck mechanic life.

@rdgsupafli 3 года назад

What type of grease are you using for this? I have lithium grease at home is that ok? Or is it specific bearing grease?

@newwavepressure6478 Год назад

Is this the same for 2001

@jackl3384 3 года назад

Is there any other way to install the crank? I can't afford a 200 dollar puller that I am only going to use once

@chadrides914 2 года назад

Then likely you can’t afford to ride a dirtbike either. Too expensive of a hobby for you. Good luck in your endeavors.

@omarvillegas7161 2 года назад

The same one tusk sells , 10+ company’s sell also. Lots of these companies are using all the same stuff for bikes, go on Amazon and they have some for 80$ a kit with the case splitter and crank puller same exact colors and designs

@chadrides914 2 года назад

@@omarvillegas7161 F’ Amazon and the people who encourage its use.

@omarvillegas7161 2 года назад

@@chadrides914 GOOOO AMAZON DEALS

@omarvillegas7161 2 года назад

@@chadrides914 the besttttt

@luistenas6321 3 года назад

I have a Question. So i just put my cases together and I didn’t have a crank puller, the guy I bought the bike from had already pulled the crank into the left side of the case and when I put the right side on it just went in together without any force and I put yamabond, the bolts and it came together. Would that be a problem?

@luistenas6321 3 года назад

Flywheel and stator were already on the left side so when I put the right side just went in very easy, please help idk if I did it wrong.

@rmatvmc 3 года назад

@@luistenas6321 Hmm.. it should be a slight interference fit so there is no play in there. Do you mean you pulled it together with the bolts? Or did it seal up against the other case half before you installed the bolts? Was it a new bearing? -Charles

@luistenas6321 3 года назад

@@rmatvmc hello, yes it sealed up against the other case half without the bolts. Then I put the bolts on and it sealed up perfectly. all bearings were new. Do you think this might be a problem? Also I got a question my power valve is getting stuck, what would cause this problem? I took it out and cleaned it, but now it’s gettin stuck. What should i do?

@TroNPopz209 3 года назад

@@luistenas6321 I would make sure all your parts fit your bike, and are properly moving.

@cheto2952 6 месяцев назад

You know if you don't talk so much after you pull the bearings and crank out of the freezer they will just drop in the case.

@aleksanderdang6899 2 года назад

Forgot case gasket??

@matthewlidel4324 Год назад

Is it normal for oil to drip out of the power valve vent hose.?

@rmatvmc Год назад

That is pretty common and that is what the vent hose is there for, but you may want to clean your power valve more often and/or find an premix that produces less buildup.

@matthewlidel4324 Год назад

@@rmatvmc what premix do you Recommend I have a 2023 yz250x using yamalube now at 32:1

@Martinkeaton_07 3 месяца назад

You put that spacer on for the primary drive gear... you didn't install it correct.. you must put your primary drive gear then the spacer then the water pump gear

@user-si6ov8ui8w 3 месяца назад

I checked the schematic, the video is correct. Almost gave me a heart attack.

@Jamie-Dean-007 3 года назад

Can we use fluid film for assembly lube or is it different than the Yamaha stuff

@omarvillegas7161 2 года назад

You guys sell tools cheaper then Amazon on some stuff then the case puller is over priced. There’s se real company’s same exact tool with their brand on it or blank same colors exact thing. But half the price.you should keep the cheaper ones in stock instead of the tusk version.

@MTnumber11 Год назад

At 22:52 the pushrod is installed deep enough to be at least flush or slightly below the lip. Mine is sticking out a half inch and won't go in. Any ideas?

@chadkartchner581 2 года назад

What is that blue spray lubricant you’re using

@chadrides914 2 года назад

Looks like fogging oil for outboards or jestskis.

@mikeking7388 2 года назад

Im the sudden spike in views 😆

@rmatvmc 2 года назад

At least you'll admit it ha ha ha! Thanks for watching! - Wes

@gabegunter7675 3 года назад

Do you have to remove the tranny assembly to replace the crank ?

@jesseleonard1429 2 года назад

yes

@Briank-ef5iq 3 года назад

Weisco cranks any good?

@rmatvmc 3 года назад

Yes, Wiseco makes solid cranks and other engine components. We have reviews on our website where you can see what other customers think of the Wiseco Crank/Bottom End Rebuild Kit. www.rockymountainatvmc.com/parts/wiseco-bottom-end-rebuild-kit-p