Full engine inspection - 300 Hours Yamaha WR450f build

[@nvmcrider8475]

Inhave an 05 wr 450 with at least 500 hour and the valves have never been out of adjustment. Yamaha’s really last when maintained and not abused. Great video, I learned quite a bit.

[@frankiemarchese2978]

That is awesome. I also have an 05, its a supermoto. I have 150 hours on the rebuild. Valves haven’t budged. I change oil around every 5 hours. Never rev limit it or anything.

[@marcosassaroli7446]

What are the respective km of 500hours? Cheers

[@nvmcrider8475]

@@marcosassaroli7446 16k to 20k kilometers.

[@DennisMerwood-xk8wp]

Back in the day we used to run our 2-stroke IT400/425/460/490F Yamaha's for 5-years! No kidding! And we rode on the Sierra Nevada mountain trails and in the desert HARD weekend after weekend. 8-hrs per day New piston and rings every two years...if needed! Rebore at NAPA Auto Parts machine shop. $50. Do it yourself at home! Coupla' hundred bucks total. Easy peasy. Maintenance: Change oil every two months. New spark plug if needed. Rev the bejeezus outa it to vibrate off the dried caked on mud! One of our mates just used cheap K-Mart 20W-50 engine oil for premix oil! LOL Radiator and all those hoses ...pffft! And no need to threaten them with tow rope to start on a cold morning! These way over complex, heavy 4-strokes are arguably worse on the trails, and last maybe one year before the huge bucks overhaul.

[@Evo836]

Brad knows his stuff.

[@alexterry1296]

Legit

[@SpaceCowboy5555]

3:17 the wear on that bucket is from the auto-decomp pin on the exhaust cam. I've seen it before. The other buckets are good to go. Not bad to have to replace a single bucket at 300 hours.

[@henripuustinen4642]

Exactly my experience with these engines as well. Usually, if the buckets are worn then they wont spin freely. In those cases you can almost always see hot spots on the cam lobes and need a serious magnet to remove the bucket.

[@brad5664]

You are right it is from the decomp but your wrong on the other buckets they are all bad but 1 when you can feel with your finger nail the the circles in the middle of the bucket then they are no good ... and we did check cams and they are still in very good shape ..

[@nealo7414]

Great Video. Thanks. I have a 03 Wr450F and was inspired to get it after watching your first series on the Wrf. Such a great bike I decided to do a full rebuild to keep it check.

[@Dookie_burner]

I also own a 2003 wr450f. Owned mine since 2006. I love this bike,so trust worthy. Mine has an Athena 478cc kit with stage 2 hot cams. Had tokyomods redo the carb. Want a new 2024 wr450 but I don't need to replace yet

[@pjinwimmr1328]

haha my 2002 yamaha wr250f has 850mth on it and still has the original piston from the factory. Regarding the wear and tear of things around the engine, the only thing I had to repair so far was the carburetor flange (shrunk with age), the clutch plates with the clutch basket and springs, the carburetor has been jettisoned several times with thorough cleaning. I do regular checks of the entire engine after 150mth (piston, gearbox, clutch), valve clearances every 30mth, oil and filter change every 10-15mth (Yamalube, K&N), shock absorbers 20-30mth and everything else that is prescribed in the service book. I service everything myself (I'm a prodigy). As for the driving style, I give it a hard time when hardenduro riding in quarries. So I could say that the one who constructed it was perhaps the god himself. :-D and I know about a lot of people who have a WR and are in the same situation as me. It is important to always pet her before riding and give her love regularly.

[@emperorkhan9941]

I loved this review. This was very knowledgeable and helpful to know. Very exiting to see how everything came apart and how much the damage was done for 300h on a 2015 model. Looking very forward to the build.

[@samcooper4984]

Love these engine vids. Loads of info and love watching tou guys show off your skills

[@desmond4780]

This is a REAL mechanic. Love the cases on towels and ease of disassembly and knowledge! Love it. Dont you wana strip my 2004 CRF450R ? 👌👍🏁😂

[@jessecrawford2711]

Had 500 hours on my drz and besides the small end bushing on the crank being bad from a big bore at 15k it looked brand new. Starting to worry about my cylinder head wish they were cheaper

[@gearedupkim9516]

WOW!! I wish I knew how to take an engine apart & build it even close to Brad’s talent. I’m learning & want to learn more & more, so these videos help. Thanks Rado for another Great video!👍👍

[@keithtarrier4558]

Indeed!!

[@religionispoison6838]

It's really not that hard man if you just buy a good manual and follow it it's real easy.

[@harrycarrano9324]

2021 yz450 completely stock still running strong never tracked but street and trail ridden oil and oil filter changes every 7.5 hours and oil screen cleaning every other no noticeable metallic sheen in the oil or any metallic flaking in the filters great bike will be doing a complete rebuild though soon curious to see what’s going on inside

[@reflexionesofmylife5225]

Greetings Iro, first of all, I congratulate you, excellent video, I was waiting for it. I have the same WR with 72 hours, so I already know more or less how many hours I will have to do the complete engine. It is best. Thanks for the valuable content. I look forward to the next video with everything new.

[@ridgedbullet2420]

Just ripped apart a 2017 apollo 250 yes the bike you can buy new for 3000cad, and it had around 400-500 hours and the only thing wrong was the wiring harness. No scarring, no damage anywhere. No metal flakes. I was kinda impressed ngl

[@ridgedbullet2420]

Also found out it shares the same cylinder and head as late 80s Honda 250

[@luislozada6445]

It’s a Yamaha 👍👍👍 solid engine

[@6226superhurricane]

if it was a solid engine why does it need a rebuild at only 300 hrs.

[@Jamie-rv5dl]

@@6226superhurricanethey’re great just depends how much you abuse/ neglect them

[@chrisvozza6530]

Dam can't believe how bad that clutch was. Awesome video though. Keep um coming👍👍

[@donaldwilcoxjr.5212]

I have a friend who races gncc and for an amateur.....he is a very solid competitor.....and has been doing it since he was on a 50cc ....His father (my best friend) is the mechanic....and he said one of the best factory KTM mechanics told him that the very best oil to run in a 4 stroke ...the very best ....is Rotella T5 .....that's is all they use......Said that they went from replacing clutches every race or every other race to now with the Rotella they only change then once or twice a season ....and these races are very hard on parts .....and that they had used every top synthetic oil on the market and the Rotella was the very best they had ever used ......so that's what I use in my 06 wr450 ....and no clutch issues thus far ....but I only ride mine wr450f ....no abuse from racing ....but my buddy who races swears by the stuff ....

[@KennethColeJr]

Need more videos like this

[@NOTTApro142]

Pretty sweet video! I am basically rebuilding my bike right now. I bought a CRF250X with an idling issue. And i broke into the head and the last guy set the valves so out of spec that ine of the valve buckets were pretty worn in, so too tight. And when i pit it all back together it ran better, but still had am idle issue. So i am tearing into the bike to get the carb, and honda set the bike up so wonderfully that i had to pull 60% of the bike apart to get to it! Hopefully the parts that i ordered finishes the job because if I am not pulling that thing apart again

[@John_Doe_6996]

If it's anything like my CRF250R, you'll get very familiar with taking it apart. You likely need to just turn your idle up a bit, or adjust your fuel screw, or both.

[@NOTTApro142]

@@John_Doe_6996 yeah, I tried playing with the mixture and idle first. Didn’t do anything. Then i pulled the valves and redid them, that made it run better but did not fix the main issue, and when i pulled the carb apart the jets were all corroded and stuff, and it was jetted a little rich. So i replaced the jets with ones that would work for the new Yoshi i was putting on it, and the air-box mod. I was going to give it a start but when i turned the fuel on the main fuel connector into the carb started leaking. So I ordered new O rings, then i forgot to order the exhaust gasket with the Yoshi and jets so i am waiting on those. Should get here Tomorrow. And maybe, Just maybe i will get to hear it run this weekend.

[@PA-Tammy]

08 WR250f over 900 hrs valves have not moved after the first adjustment about 50 hrs in.

[@dirtniron]

oh wow

[@Agustin-jo8mv]

damn! haha

[@Mymohawkisblue]

Nice video, this is the reason I will go for an electric MX bike as soon as they are good enough. Wanna ride not doing service every now and then

[@kylewitzel3540]

Pretty wishful thinking

[@jebediahnightlinger6357]

Great logic....im waiting for taxes to go down before I make my first million dollars

[@Mymohawkisblue]

Yeah yeah we’ll see

[@2strokelover93]

Parapro episode! ❤plz keep these coming

[@stefanhansen5882]

This was super interesting. What is the total cost of fixing everything which needs to be fixed at the 300 hour mark? Thanks!

[@danielkarlsson608]

I recently did a 2021 YZ 250 engine with 40 hours on it. It had some noises at idle. Turned out one of the gears had 3 bad, worn out teeth. Must have been a manufacturing defect, like a heat treatment gone bad or something. Only one gear was worn, and the bad teeth were next to each other. The metal from it also got into some bearings and made a rumble. But now she runs again.

[@zardportugal]

I say that for those 300 hours the engine was not bad at all. In some time the engine will be better than new. Cheers.

[@ItsCheechFool]

And this is why I will always put 500 hours on my 450

[@claytonclevenger8503]

Get this dude an engine stand.

[@brad5664]

i have one and hate that thing ...lot easier for me this way

[@Bruno-my9uf]

Good engines they are good mech. Teaching

[@niconine268]

Brett is the boss

[@ashleypearce3507]

Brilliant post

[@marcosassaroli7446]

Very interesting video, just wondering, how many km did the bike have? Unfortunately thees Yamaha don’t have hours meter so we can just guess most of the time.

[@michaelxr2460]

I’ve never watched a video with Brad, but to me he sounds just like Jeremy McGrath.

[@henripuustinen4642]

I would find it very interesting if you measure everything according to the wear limits in the repair manual. A good machine shop with good instruments would probably help you with that. My thoughts about the valve buckets are that they looked perfect and moved freely. But it would be interesting to find out if the cams are worn in this case. Usually I find that the decomp pin is worn on these older bikes, making the bike a bit harder to start/kick over. Interesting "autopsy"!

[@brad5664]

well i am a very good mechanic and i did check everything to spec and thats why i said what needed to be replaced !

[@Novato_en_Moto]

I’m having problems with the e-start, we are guessing that may be the the torque limiter, but in the manual it’s only says inspect damage wear, we guess it’s have to much movement, can you Do a video checking it?

[@christianlemonade5355]

Hope y’all do a build video .

[@--LZ---]

Did you take a look at your oil pump by any chance? a month ago I bought a 2012 wr450 , it seems like it ingested a lot of aluminium and after hearing a change in engine noise I decided to do a teardown. Oil pump was really scratched, probably not giving enough pressure to the head and the valve buckets didnt look better than yours... for 50 dollars a piece definitely not a fun part to replace. I would really like to see how the oil pump looked on this engine because your bearings were in a way worse state than mine. Did you have any play in the main bearings? I have some marks on the crankshaft journals and tiny bit of play in bearings, gonna replace it all to be safe.

[@sidecarbod1441]

It would have been nice to see the valves pulled out of the head.

[@zozias101]

Yo! Good video! Do you happen to have insight on wr450 cylinder head compatibility between different year models? From pictures i've seen they look identical but still have different part numbers🤔 I have 2005 wr450 that dropped valve and ruined one valve seat and guide. Newer heads are like 200€ cheaper than one for older model.

[@dirtniron]

I am not sure, but if the part number is different than the head probably has some differences.

[@mnap89]

Why do this egnies need to be rebuilt after such short time in comparison to normal street engines?

[@dirtniron]

high compression, high output engine, its a race engine pretty much, way different than cruisers or other bikes

[@robsonenduro3316]

Looks like ktm engines are more durable? mine 500 exc-f at 600 hours still not even opened yet. Would be good to compare.

[@michaelburke1116]

Could also speak to the possibility that you take better care of your ktm than the previous owner of this wr. He stated multiple times the bike overheated to the point of discoloration.

[@tieoneon1614]

LOL, nice try. Always a KTM guy in the comments trying to claim everything.

[@mxexplorer8766]

Both are good engines, but Yamaha are more powerful, the mid range torque that these Yamaha 5valve make is insane. I like KTM too, already had 2. But I always turn back again to Yamaha😂😂 On Yamaha I feel my heart connected to the engine, it's something strange and difficult to explain. I can say that I like KTM and Husqvarna, but heart loves Yamaha.❤

[@wyattcitizenzap4539]

do you have a video of the bike running before rebuild?

[@gixxer7907]

Dang! I did just a top end on my 2004 ktm 450 exc for peace of mind at 250 hours and put a hi comp piston in and it's around 500 hours now, vid got me scared for my bottom end and crank etc 😅 oh well, ride it till it breaks lol

[@desertrider325]

Wish we could of seen the bearings being pulled. What did you use?

[@craighills2382]

All from clutch abusing = Simple The clutch did the damage, the fork shifter gears were getting harder to mesh ,but lets grindem until we findem. All the heat up to the rod all from slipping and ? obviously for a while not knowing. Because people that know, even if broke in terms of $ ,wouldn't push an engine with a clutch slipping, it only makes it worse in a big hurry .Its a lite throttle thing not to much load Simply put, if you can't work out your clutch is slipping. Maybe you can show a simple video, on how to test under load ?

[@brad5664]

yes when a clutch slips bad the rpms on the rod without a load will cause the rod to get hot .....i have had guys bring me bikes that the clutch was so bad you could put in gear rev it up and bike not even move ! rado bought this bike from a guy that probably didnt realize the damage a bad clutch will do !

[@nevillemanno4912]

So what does 300Hrs relate to in Km's approximately?

[@thomastommygun8487]

Unless you are flogging the crap out of it at 100kph for 300 hours that’s 30.000ks but riding steady and proper service and maintenance you can go well over 500+ hours without breaking into the engine.

[@nevillemanno4912]

@@thomastommygun8487 Yeah I was assuming an average of 70K's/Hr, which would make it over 20,000K's, which is still not bad for an enduro motor?

[@mikaboyd7385]

How much does a “whole 9 yards” rebuild cost aprox?

[@TheMadMonkey3]

I would estimate 2500usd maybe?

[@ebiebrahimi7472]

Can you ask him what is the most durable engine that he worked on ? For Enduro bikes ? Thanks

[@fathersun6238]

I have 3years me valves unchanged but I use the bike IDK 1000 hour's 3/4 years.

[@leighclifford7808]

Epic video

[@gtscc9977]

So when can I bring you my bike?😭

[@Bruno-my9uf]

And be nice on that engine!

[@rezkidgamingyt4725]

Just wondering, is the WR250f 2023 the same or are there big differences in them

[@dirtniron]

it is a different motor.. this is old generation YZ450 motor with fuel injection

[@crispincurtis8585]

Cool video

[@PBmxer]

great content.

[@singletrackjunkie488]

300 hours is nothing. My beta 390 race has 590 hours on original top end. I woulda thought the WR450 would go much longer.

[@dirtniron]

thanks for sharing

[@filipsrejber8683]

It looks like I dont need engine case splitter. 😊

[@brad5664]

just depending on what motor the yz and wr motors come apart easy others need pullers

[@nicksnicknet]

So WR450 motors good for about 13-15 days of continuous (hard?) riding is what I'm hearing?

[@c4r5on88]

Wish i could find a engine builder like you in the uk. Hard to trust anyone here :( just horror stories

[@jurjenrienmeyer6983]

Run without oil than it looks like this other wise its runs fore 300 more hours

[@JustinHurst-o4s]

Of course the piston is scratched. Bloke just dropped it onto the rest of the engine instead of showing the slightest due care for the customers engine.

[@luisquinta3137]

This happens on an engine that has been poorly maintained, not on a Yamaha engine with 300 hours of normal operation.

[@desertrider325]

Also you skipped pulling parts of the clutch assembly. Please show in detail hydro blasting the cases and what you use. And the bearing instal. What year WR450F is this? Please be Very detailed on the re assembly. Don’t leave out any details. So we can use this for our own WR rebuild.

[@robh3267]

When a modern 4 stroke breaks the results can be catastrophic making the engine not even worth trying to rebuild, when a valve breaks it will destroy the engine, everything about riding a 4 stroke is it requires more of everything, more time for maintenance and more money for frequent oil changes, costly parts and expensive repairs but they sure are fun, hard to put a price on that.

[@thomashardy4326]

My 4t and 2t cost the same on oil. They both us the tame amount of oil per hour our of use, relatively.

[@Mymohawkisblue]

I agree, all this fckn maintenance kills the fun. Crap engines. 300h is nothing and then have to do a rebuild 🤣

[@singletrackjunkie488]

500 not 590.

[@davidgraf3537]

This mechanic is a tool. That crank is normal looking. They heat them at the factory when they press them together. That's the heat marks you're seeing. But, I suppose this guy is sponsored by an aftermarket crankshaft company, so go ahead and give false info to help sell some cranks.

[@dirtniron]

yes, Brad told me the same thing about factory heating the crank to press it together, however he was pointing out at the rod that got heat marks as well. He is not sponsored by crank company.

[@brad5664]

so first off i did say the heat marks on the crank is from the factory the heat marks on the rod are NOT from the factory and was caused by the abuse the motor was put to by the previous owners that rod would fail if we didnt replace it so i think your a tool my friend i have done over 4000 motors and know what to do so keep on being a keyboard warrior ..thanks for watching ...

[@michaelwendler5589]

@@brad5664 11:35 is when you start talking about the crankshaft, and not once did I hear you say that them were factory marks?!

[@faissal8997]

​@@michaelwendler5589maybe it was cropped by the editor. I honestly see no way he is sponsored by anyone. I can tell if a mechanic is professional or faking it.

[@fathersun6238]

300 hours you don't change a thing the bike is NEW murican victims 😂😅

[@jeeperzcreeperzz]

If you have a bike and don't even know that it has two drain plugs... you shouldn't be riding 😂 ignorance

[@fathersun6238]

Now my opinion about ALL yamaha engines not YZF ,all the rest it's stupid 2 change pistons, valves, every some hundred of hours. U change filters air and oil filter, U change your oil every 1000hours if you are non't professional rider,& you look your valves every year, same thing your clutch rings that's all. Don't throw your money for NO reason STOP being victims