Yamaha YZ85 Bottom End Rebuild

In this video I take the Yamaha YZ85 engine from case halves to a fully assembled bottom end.
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Affiliate Links
Crank Bearings: amzn.to/3cqSVSU
Tusk Crank Puller: amzn.to/2z8zcce
Athena Complete Gasket Kit: amzn.to/2XHdHJN
EBC Clutch Holding Tool: amzn.to/379KGuq
Music:
Intro:
prod. by Bankrupt Beats
/ bankrupt-beats
Outro
Retnik Beats:
(www.youtube/c/retnikbeatsbe/)

[@FatBoyFlem]

Dude, love the cardboard trick for the screws labeled out to what screw assembly goes where and the pattern they were in. I’m definitely stealing that idea. 👍😎🧐

[@GarageAddiction]

I can’t remember who I stole that from but it’s come in handy so many times haha

[@JohnnyLee8355]

@@GarageAddiction From Kevin?😏

[@GarageAddiction]

@@JohnnyLee8355 Kevin?

[@murrayminimotors1674]

Ssme here sweet idea I'm a subscriber now!😅

[@brianpriest7000]

I used to do the cardboard trick but then I saw a video of somebody that made it simple when you put all of the screws in they should all stick out the same amount after that I stopped using the card board

[@vprliltaki9510]

I love this video, you did amazing and I am so glad you did this .

[@johnnymelton8173]

You know I don’t really understand why your views are so low man! This video really explains everything and is super complex! I’ve been working at a motorcycle shop lately as a mechanic and honestly transmission stuff is the only thing I really needed a freshen up on but man I gotta say thank you so much, cause basically with any two stroke the transmission is gonna work the same! I love how detailed your work is and I would be definitely looking forward to getting in contact with you in the future!!! We should start a little side hussle helping our friends and stuff build their bikes to where they wanna be! Let me know if you do any kind of machine work or anything man! You’re time here is extremely valued!!!!!!!!

[@GarageAddiction]

Haha thanks! I wish I had time for a side hustle, I have a hard enough time getting some KZbin vid up haha. I used to work at a shop way back when, some of the best times!

[@jordanerickson478]

Awesome video! Helped me get my sons bike back together.. only problem I’m having it the clutch rod assembly.

[@GarageAddiction]

Thanks! Yeah I wish that section exported properly... It was the ball bearing, the rod and then the plunger going in there.

[@jordanerickson478]

@@GarageAddiction I ended up figuring it out. The rod,ball, plunger was easy to follow. It was the push rod that falls through the case that activates the clutch that I couldn’t see. Mine slipped out an inch while I installed basket . Just had to remove basket and seat the push rod fully before putting the rod, ball and plunger in. Again thanks for the video much appreciated! My son will be out ripping around again tomorrow!

[@GarageAddiction]

@@jordanerickson478 Ah gotcha! Awesome to hear, enjoy the little ripper!

[@GMZee559]

Very nice video on the rebuild💯💯👍

[@GarageAddiction]

Thank you!

[@doncastillo09]

I’m watching this video now so when I buy my 85 I can take care of my own

[@charlieatkinson2728]

Sweet!

[@MTRBuilds]

Great video, wish you would have had some captions to explain the torque specs and also some more narration on what sealant and size sockets you were using. But other than that great video, also some faint background copyright free instrumentals will help with these kinds of videos!

[@friendsinlowplaces619]

Could you please give me a detailed description of the press, and crank puller and any specialty tools used, I have 2 05 yz85s I need to rebuild for my boys, thanks in advance!! Great video very clean very professional!! 💪🏼💯👍🏻

[@GarageAddiction]

Thanks! Got the crank puller and clutch holding tool in the video description, the press I got from Harbor Freight tinyurl.com/3da4299h, as well as the bearing race and seal driver set tinyurl.com/mfh8x8dm.

[@MrTherio86]

Thanks for the helpful video. I’m rebuilding a 2008 yz 85

[@GarageAddiction]

Glad you found it helpful, it's got some flaws but hopefully I'll reshoot this when it blows again.

[@MrTherio86]

@@GarageAddiction finished up the bottom end today watch the video a couple more times. I subscribed!

[@jarredmclees1727]

Got a yz 85 big wheel needs bottom and maybe top end rebuild as the pistons black

[@nickarmogida3836]

hey man i loved the video. i was wondering how the hell you got those tight ass phillips head bolts off in the first place without stripping them. thanks

[@GarageAddiction]

Thanks! I used a hand impact driver like this one that I picked up at harbor freight. www.amazon.com/dp/B07R96M9VW/ref=cm_sw_r_cp_api_fab_wmsFFbDBCTABB

[@danshealthylifestyle8443]

Nice thanks for sharing

[@GarageAddiction]

Glad you liked it!

[@crazo27]

Did you have any timing issues or did you put stator assy in exact spot when taking out?

[@GarageAddiction]

I didn't have any timing issues and I just set it back to the same spot, the screw heads left a nice indication of where it had been.

[@bhunt6199]

Hello, my yz85 is leaking transmission oil out of the little breather hole under the water pump. Do you know what would cause this? thank you

[@GarageAddiction]

Sounds like the inside seal on the water pump shaft is leaking.

[@zanefam656]

hey i know this is an old video but i have a yz85 and the Kickstarter is not engaging half the time i know what i need to do but i dont know how to fully take the clutch off to put a little clip back on.

[@GarageAddiction]

Taking the clutch off is 15:00 - 20:00 in reverse. Need to take off the whole right side cover, the clutch pack (bolts, springs, plates), the plunger, nut, washer, and then the baskets. It's easiest to hold the baskets with a clutch tool when taking off the center nut but I've heard you can use a penny in the gears.

[@mrwaffles2901]

What is the part called you put over the right crankshaft seal? Mine is missing and don’t know what it’s called to order a new one.

[@GarageAddiction]

www.partzilla.com/product/yamaha/5PA-15118-00-00?ref=61615dd49cf9f61eea8ceeb390f8f7f870850ef5 PN: 5PA-15118-00-00 Holder :)

[@rsvelt32]

Bro can you help me with the timing of yz85? I used the fly wheel of yz85 on my yamaha dt125 just want to know the position of the pulser when its TDC

[@GarageAddiction]

kzbin.info/www/bejne/nJrUp3WYmrOZaqM

[@Chrisg654]

Do you know the torque spec for the gear that goes on the crankshaft? I can seem to find it online. Also putting the bolts in cardboard was a lifesaver👌🏻 even better with a cardboard box so they can hang down inside

[@GarageAddiction]

The primary drive gear nut is 57 ft-lbs for 2002 to at least 2006 and probably later, pulled this out of my Haynes manual haha.

[@rachidlecoloenhybrid2823]

💪🔥

[@justinwalk1121]

What are the main causes of the bottom end going bad besides running it low on oil?

[@GarageAddiction]

Wear over time or lack of oil are probably the biggest contributors. I've had cranks and bearings last well over 200 hours running 32:1 in all my minis. The YZ I just replaced them while I was in there, they were still in great shape.

[@AndrerileyLSX]

My shift shaft keeps sliding back and forth if I try to put the shifter on does anyone have any idea why?

[@GarageAddiction]

Did you take the engine apart recently?

[@trevormosier5767]

I watched your video, super helpful by the way but I think I may have missed something though. After the rebuild I test drove it and second gear slips in and out but the other gears work fine. What do you think the problem is? Thank you

[@GarageAddiction]

If it’s slipping out of gear completely it may be the dogs on the gear are worn and not engaging properly or potentially the shift drum or fork. It’s hard to say but most likely transmission related.

[@trevormosier5767]

@@GarageAddiction it gets into gear but it stutters or slips, all other gears work perfectly though.

[@GarageAddiction]

It’s possible that it’s the clutch but I would expect slipping in other gears under full power

[@christinaciko4074]

HI. I HAVE A YZ80 2001. HOW DO YOU CHANGE THE BEARING ON THE SHIFT DRUM? THANKS STEVE.

[@GarageAddiction]

I’m not sure actually, I’ve never had to pull a shift drum apart, I imagine they are press fit together and it’s probably way easier to replace the whole drum.

[@Millet_kidd203]

Bearing puller .. if your cases are split already autozone lets you rent it for free

[@guillersuarez5085]

its very ok

[@NordicMoto]

Hey mate i have a little problem with my yz85... after my last ride it does not start annymore at all. It have only runned 4 hours after last rebuild. I have spark. If i roll start it it just dies. It dont want to stay running at all. I have also tryed to put a little petrol straight into the cylinder but it only backfires..i also only needed 1-3 kicks to start it at that time. But now its totaly dead.. i have only rided it 4 small times after i bought it... would love to start ride it again.. annyone here got some tips for me please?

[@GarageAddiction]

Take the plug out and have someone kick it to see if the compression blows your finger off the plug hole. If it’s got good compression check the carb and reeds.

[@nicnadu0515]

I’m sure you’ve heard it a million times but try to heat the cases before putting the bearings in it helps me

[@GarageAddiction]

Absolutely! I don’t think I had a torch or the balls to throw the cases in the oven at the time haha

[@AngelHerrera-oh5vn]

Gracias papito

[@eddiesmi3005]

What’s the easiest/best way to install the crank without a puller

[@GarageAddiction]

Heat the bearings up and freeze the crank. It'll make it most of the way in. The puller makes it super easy though.

[@FloridaBikeSupplyOnline]

Amazing video man!! A+++ 👍👌💪 I had a question for you, I'm buying a 2015 yz85, and I guess the chain came off the rear sprocket and bound up in the front. I guess now it only goes into neutral and third. Any idea what the problem could be? Where I should start? I work on cars, and put a big boar kit on my pitbike awhile back, but this will be my first attempt working on the transmission (if that's even the problem). It definitely looks like you know what your doing, any help would be very appreciated 🙂 thanks again for your the amazing video!! Cheers

[@GarageAddiction]

Thank you! You could start by looking at the shift star by pulling off the right side cover but my guess is something grenaded in the transmission which means you’ll have to split the cases and see what let go.

[@FloridaBikeSupplyOnline]

@@GarageAddiction You were totally right. It looks like a gear popped and pushed out (or split) the right side crankcase. There was pieces of a gear and a big hole once I opened up the side. I just ordered a bottom end that needs a new crank, and I'm hoping I can reuse the crank that's in there right now. I'm not sure if the bent crank in the new bottom end might have messed up bearings and seals? Is there a way to tell if the bearings and seals are bad in the bottom end I just ordered? I've watched your video here like 30 times, I feel like I already know this thing front to back lol. Thanks again for all your help, your a god!

[@GarageAddiction]

@@FloridaBikeSupplyOnline If you need to swap the crank I would just do bearings and seals at the same time. It would suck to do all the work splitting the cases just to find a bearing goes out a few miles down the road. You can put a little load on the inner race and spin it to see how it feels, it should feel fairly easy to spin and be free of any notchiness or gritty action. Seals are harder but if there is any indication of oil weeping past they're bad.

[@FloridaBikeSupplyOnline]

Hey, sorry for asking so many questions! 🙂 Your fast at responding and always have great info 👍👌 So I noticed that my swingarm is missing the rear chain guide mount. I didn't notice it when I bought it, I guess it there was a bunch of little problems 🤔 any thoughts on how I can fabricate one? Or should I just buy a new swingarm? Or do you think it'll make a big deal? Other then guiding the chain and keeping it from comming off, I read that it's also there to protect feet from getting sucked up in the chain and sprocket? I'd love to save some money, I'm kinda broke atm. I could afford the chain guide itself, but buying a new swingarm for just the chain guide mount kinda sucks. What do you think, have you ever ran across a problem like that? Thanks again for everything, your the man! Cheers

[@GarageAddiction]

@Chris Cameron I have the mount on my kx65 but I don't run a guide on it. I'm only on asphalt and not jumping the bike so I'm not too worried. You could probably make a bracket that clamped around the swingarm with the mounting points for one pretty easily by bending some steel flat bar. If you or someone you know can weld aluminum you could probably cut up some round stock and remake the original mounts. You might also be able to find a used swingarm on ebay for cheap but that's a lot of work for a little bracket.

[@08cr85perry]

Isn’t the kickstart idler gear on backwards?

[@benbrook8231]

And nobody noticed that you could have bent the rod or cracked the case when you pulled the crankshaft through. Pretty lucky. Connecting rod looked pretty stuck on the side of the case.

[@anicoleanthony]

Do you freeze your bearings before you put them in?

[@GarageAddiction]

Yep I throw them in the freezer at least a day ahead of install!

[@FoursquareT]

How did you loosen and tighten the primary gear on the crank?

[@GarageAddiction]

I believe I used an impact to get it off. You can use the clutch tool in the basket to lock up the gear or I’ve heard everyone talk about a penny in the gear mesh to lock it up but I’ve never felt too keen on putting that much torque on a penny in the gears.

[@FoursquareT]

Garage Addiction I have a gear lock tool but won’t work because the basket is too close the bolt to get a socket on it. How did you tighten it to torque spec? Or did the impact work. Mine won’t budge mine off

[@GarageAddiction]

Oh you know, that sounds familiar, I may have ended up holding the rotor on the other side of the engine with a strap wrench to torque it. I think it’s in the ballpark of 60lbs which should be doable without an impact if you’ve got another set of hands.

[@drewharper832]

Could you identify and tell me where a piece to my yz85 goes ours are the same just I can’t remember where this piece goes and I didn’t see it anywhere in your video

[@drewharper832]

And I was also wondering what you dropped into the main transmission axle before the bb at 15:08

[@GarageAddiction]

Shoot me a dm on Instagram

[@GarageAddiction]

It’s the shaft that goes into the clutch lever

[@thisminecraft7218]

Hey I’m working on my yz85 and I have four black threaded things they’re small and I don’t know where they go can you help me?

[@GarageAddiction]

Shoot me a picture on Instagram: garageaddiction

[@thisminecraft7218]

Garage Addiction Thanks for the quick reply I’ll send you what it was I did find out it was an extra item that the guy had on his fly wheel to add weight and don’t know why he had it there

[@mclovin_it8872]

Where could i find the whole rebuild kit?

[@GarageAddiction]

If your cylinder is good or you get it replated to stock bore you can run this: amzn.to/3EV66LO If you need a new cylinder: www.ebay.com/itm/126104677714?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=tH5cu2V1RcS&sssrc=2047675&ssuid=dTMFLbyrTt2&widget_ver=artemis&media=COPY

[@cfosnacker]

Why did the video go black for 5 seconds during beginning of clutch installation

[@GarageAddiction]

Video export issue, hasn’t happened since that I know of though.

[@wadesoutdoors1914]

What kind of press were you using ?

[@GarageAddiction]

12 ton harbor freight press

[@tyrellwongus7391]

How much would it cost for you to rebuild the top and bottom end of my yz85 2005

[@GarageAddiction]

My guess is that a local shop could take care of it faster and for less. Shipping alone if you’re not local would make that super expensive.

[@tyrellwongus7391]

K

[@gedebuscreuw1356]

What is the price of the ignition yz 85

[@GarageAddiction]

Depends on which part you're looking for, the stator, harness, cdi, coil and plug boot.

[@russellhuston6481]

Should reilly use a drop of lock tight on all ur case bolts.

[@GarageAddiction]

That's always worth some piece of mind.

[@hdf5414]

Part 2 ....like it revs high but it doesn’t really go

[@emhcontent]

What is that parts name what you put in 12:05?

[@GarageAddiction]

It’s called a holder on the parts sites 5PA-15118-00-00

[@hdf5414]

Can you send link of a crank puller that I can use on Amazon??

[@hdf5414]

For a yz80 2001

[@GarageAddiction]

@@hdf5414 (Tusk Crank Puller: amzn.to/2z8zcce) the 80 and 85 have the same thread size on the crank so this should work for you.

[@alexarks517]

The pressure plate was installed incorrectly

[@GarageAddiction]

Looks like it, I reset it so it was making contact with the plates but it looks like I used the old footage. I really need to go back and reshoot this entire rebuild.

[@iliketoparty6163]

ok man i am doing the counter shapft seal that your putting in at 2:16 and the one i keep ordering is two small and parts fish dont show the oem one (weird) what is that part #

[@GarageAddiction]

93102-26042-00 - OEM I've had a lot of luck with all balls kits too - amzn.to/3q4FMe0

[@iliketoparty6163]

@@GarageAddiction so I ordered that part and it's is way two small also ...and your video the seal looks way different in size then what I keep getting ...I do no mine is a 06 ...I scored the bike super cheap and am now thinking this is the reason . Not sure what my next move is now

[@GarageAddiction]

@@iliketoparty6163 That's bizarre, the seal is the same part # from 2002-2020. Can you shoot me a picture on instagram or discord? curious what the seal surface looks like

[@iliketoparty6163]

@@GarageAddiction hell man I dont have either insta or facebook ....but I am getting this same reaction from everybody ...iv done these seals before on other bikes so I no it's not me ...was just hopeing it was something else

[@GarageAddiction]

@@iliketoparty6163 not sure this is even possible but maybe someone put a yz85 top end on a yz80 bottom end. I've seen it on my kx and a cr85. The part numbers are different between those two models

[@bhunt6199]

Hey bro I really need the clutch basket nut torque spec for this bike. It would help a ton if you could respond quickly thank you

[@GarageAddiction]

86-1992 is 40 ft lbs, 1993-06 is 50ft lbs.

[@bhunt6199]

Garage Addiction hey do you know if any of the bolts need loctite andwhatbis the torque spec for the flywheel nut thank you

[@mauricekemp2185]

What's the torque spec on the flywheel and clutch basket

[@mauricekemp2185]

I'm rebuilding my yz80 bottom end today

[@GarageAddiction]

Depends on the year

[@dugfern]

What's the hole in the case by the water pump for?

[@GarageAddiction]

It's a weep hole, if the seals go you'll see coolant coming out of it.

[@dugfern]

@@GarageAddiction Thanks for that info. I was just noticing some coolant coming out of my grandson's water pump on his yz85 when it warms up.

[@bertafullsender7108]

What year was this bike

[@GarageAddiction]

2005

[@jamy41]

Zero assembly lube? great way to crack a case or damage a bearing....

[@krishermanowski3599]

How did you do ignition timing

[@GarageAddiction]

kzbin.info/www/bejne/nJrUp3WYmrOZaqM :)

[@krishermanowski3599]

@@GarageAddiction yea I’ve watched but how do you know how far to drill the big bit or the little bit.

[@GarageAddiction]

It depends on the dial indicator, the smaller bit goes through completely to allow the indicator through and the bigger bit is to make a hole for the shoulder to sit in the plug.

[@imondemontime3073]

What’s the bolt called for the oil

[@GarageAddiction]

The oil drain bolt / plug?

[@imondemontime3073]

Garage Addiction can’t find the right bolt for it

[@GarageAddiction]

95027-08080-00 for a 2002-2006 I think. www.bikebandit.com/oem-parts/detail/yamaha/95027-08080-00/b1280648?m=145686&sch=253764

[@highlightzilla9581]

I've done so many I don't need a torque wrench know the feeling of 50 pounds with out it Jk this is why I'm here I need to learn 😂

[@Dholmes5kds]

What year is the yz ur working on

[@GarageAddiction]

2005 here!

[@Dholmes5kds]

I got a 09 is it the same thing

[@GarageAddiction]

They're all pretty close until you get to 2019ish and they get a power valve.

[@johnnymelton8173]

My boss can’t even really explain things to the point of understanding!! And he’s been in the buisness since the 70s!!

[@loriortega6536]

Hey, I have a YZ85 and I blew the motor and I was wondering if you can give me your number so I can talk to you about rebuilding my motor.

[@GarageAddiction]

Shoot me a DM on instagram: garageaddiction

[@jondadon3586]

Mate you should heat up the cases instead of forcing in bearings cold

[@GarageAddiction]

I need to work on a bbq setup for heating. The torch is too inconsistent and putting them in my oven is less than ideal haha

[@dant565]

@@GarageAddiction i always use the oven. Works great. The missus doesn't like the smell, but hey. Bike life🤘

[@hdf5414]

Bro why does my 2001 yz 80 rev high on all gears like they go by fast can you help me figure out what’s wrong?

[@GarageAddiction]

Kind of sounds like a clutch issue, like it’s slipping.

[@hdf5414]

Garage Addiction can It be a overheating issue too? Or no

[@GarageAddiction]

Sounds unlikely, you’d probably blow your head orings or empty your rad in an overheating state

[@pmfkeim6330]

What year is your motor ?

[@GarageAddiction]

2002 I believe

[@pmfkeim6330]

Garage Addiction trying to rebuild my bike but don’t know the year I bought the motor in frame separate all I know is the cylinder says 5pa y-2

[@GarageAddiction]

@@pmfkeim6330 There should be an engine number on the top of the right hand case that you can run through an engine decoder to give you a year. These engines are pretty similar for the majority of years.

[@Realdeallarry]

What press are you using

[@GarageAddiction]

A harbor freight 12 ton. www.harborfreight.com/12-ton-shop-press-33497.html

[@Realdeallarry]

@@GarageAddiction i picked it up and used it to do my 85 bottom end thanks

[@Realdeallarry]

what torque setting is the flywheel nut, the crank nut and the clutch basket nut

[@GarageAddiction]

@@Realdeallarry These are all based on a 2005 yz85: Flywheel nut: 24ft lbs Crank Primary: 40 ft lbs Clutch center nut: 54 ft lbs

[@charlieromeoh]

You had to pull the crank through on the stator side again because you didnt align the rod correctly when you pulled it through the first time, good way to bend the rod and destroy the crank 🤦‍♂️

[@Alias11-]

Why no gasket?

[@GarageAddiction]

For the case halves? They don't come with one.

[@Alias11-]

Garage Addiction thanks I didn’t know that lol

[@dominenceclark1607]

Made me miss the whole part your hand in way the whole time

[@GarageAddiction]

Always framing the shot well is a skill I'm definitely working on.

[@bendover357]

You should of got the engine painted

[@GarageAddiction]

Yeah one one of these days I’ll have to do a Cameron Niemela style build. I’m usually function over form because I’m impatient and want to ride :)

[@wilfreddestofzuuger9005]

that crank falls right in to the bearing... your crank is shot, its not gonna take long before its gone have crankshaft play at the flywheel

[@GarageAddiction]

I don’t know about falling in haha it took a crank puller and several moments wailing on it with a mallet

[@trakaill]

the one thing I came here for. Clutch assembly, rods, bearing ball functionality... it all went black... trash!

[@GarageAddiction]

Oh man, I didn't realize this little section failed to export. It was torquing the basket down followed by the ball bearing insert and then the rod.

[@mecalex3102]

You don't say the torque

[@jamiemurphy3404]

No lube 😤😤😤😤😤😤

[@GarageAddiction]

The crank bearings got a kiss of oil but I didn’t have it in the video. I’ll throw that in next time.