Rebuilding a KX125 Engine - Completely!

[@ShannonD.999]

Great video, enjoyed the journey thoroughly! Man of many skills, gear head, koi farmer and hero of lobster!

[@vicconstruction9126]

I LOVE LOVE LOVE how it's one big long video. So much better than 15 five minute clips all over the place. I take my hat off to you sir!

[@Bradybrandwood]

Vic I agree! It’s nice to actually sit down, relax, and get the complete story. Thanks for watching. ✌️✌️✌️

[@michaels9606]

freakin awesome dude, im restoring a 1985 kx125 and this is going to help a lot!

[@Bradybrandwood]

Michael that is awesome!!! I’m enjoying the resto on this one. ✌️✌️✌️

[@chuckingram5966]

@@Bradybrandwood woohoo looks like you really scored finding that KX. The rolling chassis is straight except for the rims but you picked a very nice pair to replace the originals and that motor man you lucky dog that unit is sweet hard to find the old kx's with a motor in that good of shape. Do you remember the DMC package racers? I was working with my old friend Dave Miller for about 7 years during the eighties and we built and sold the s*** out of those bad boys. I'll talk to you later buddy oh wait one more thing have you gotten Leon a girlfriend yet please let us know take care peace

[@Bradybrandwood]

@@chuckingram5966 Hey yeah I had a lot of fun with this restore, and am so impressed with how crisp the engine is. I was on CR125’s in 85, so raced against a bunch of these KX’s. I do remember the DMC racers well, such amazing powerhouses. I’ll have a gnu Leon video up soon. Thank you so much for checking out the channel. ✌️✌️✌️

[@smurfinghot]

Great video, I am in the middle of taking apart my 98 kx125. Thank you sir

[@kimdawcatgirl]

Spider says, " I'm not checking out this engine, my friend Ricky Bobby got painted over and I was trying to free him!" The cylinder came right off, and so did Ricky Bobby! And so, while Brady takes apart the engine, spider and his fallen friend, Ricky Bobby, make their two hour journey back home, where he will be laid to rest. Right where his father, and his father's father, and his father's father's father, and his father's father's father's father before him were laid to rest. All in 2020. In honor, Brady grabs his first, and last by the looks of it, beer of the day and prepares to crack it open while shifting gears. Remember kids, don't drink and drive, even if you can't go anywhere, as we have seen Brady do while motoring around the koi pond! All in all, it was the best $20 Brady has ever spent...on beer! Excellent video! Brought back memories of watching my dad restore cars and motorcycles. His video would have included many bleeps tho! Lol! PS Could be that ride that Billy Joe McCallister took off the Tallahassee Bridge and got all that moisture in the engine. Lol! Are you singing that song yet? ;) If you see a chance, take it! Sorry I stole your thunder and told the back story of this video. I know you were saving it for a rainy day. Haha! A broken spring meownt, he says in the presence of inspector kitty! And pray tell the location of these wild "hares"? Careful, kitty might like to chase said " hares"! Oh no! Don't cut the Saran Wrap! You can use that later after a couple more beers so your wife doesn't feel cheated you spending all that money on a broken ride!

[@Bradybrandwood]

Kim I seriously need you to write my scripts. 😆🤣😀✌️✌️✌️

[@winrockproductionsllc440]

Brady, your how to is so informative going to be our reference guide when we finally find an old frozen up yellow or green 125. really like to find an old super rat but that may be impossible to get parts for.. 125 mx bike, lift the motor by hand and put it on the bench!!, beats the hell out of the Nissan motor swap Justin did... .Awesome video!!

[@Bradybrandwood]

Very cool Dave! ✌️✌️✌️ I do see some old Hodakas come by the ‘Vintage MX Buy & Sell’ groups on Facebook from time to time.

[@charliegigante9672]

Well it's good to see Dad's old adjustable crescent wrench survived the break in too! 35:30 Leon Rules!😎

[@stevend3753]

I remember on my 85 KX 125, when it came time to replace the piston and rings, the hot ticket was to use an 86 piston and ring because the 86 only used a single ring, not dual rings like the 85, so it revved quicker.

[@NOTTApro142]

Yeah wait, how would putting an OEM part from a different year on make it rev quicker?

[@schaefer692002]

Great video! Very easy to understand what your doing and I didn’t fall asleep watching it! 👍 Are those CRs for sale? Lol I have been looking for a 79 or 80 CR125 and 250! I raced both those bikes back in the mid 80s and want to find a 125 and 250 a 1980 250 and a 79 or 80’ 125. We are going through the same thing you are with an 86 Kx 125 for my grandson. I did the same thing, the compression test was great, it even ran for a couple laps around the yard, until it seized!

[@taffydownunder6457]

Really enjoyed watching this great video thank you for Sharing with us I’m now a new subscriber 👍🍺

[@Bradybrandwood]

Awesome! Thank you for watching. ✌️✌️✌️

[@danielrelph2092]

Good job overall,but next time soak the clutch plates overnight before assembly

[@barnabyjones7823]

Is there a gasket that goes on the bottom side of the jug or just metal to metal ?

[@Bradybrandwood]

There is a gasket. ✌️✌️✌️

[@barnabyjones7823]

@@Bradybrandwood ok thank you.

[@waylonwilkins1948]

Great detail video!! Helped me out alot. I'm having a problem finding case gaskets. Could you please give me the part number on the kit you found?

[@Bradybrandwood]

Hey Waylon it was an Athena 1985-86 KX125 complete gasket kit from a seller on e-bay,… But it looks like the listing has been taken down now.

[@williamkudrna5843]

There are two KX 125's i'm looking at. A 85, and a 86. I'm hoping to get them both.

[@Bradybrandwood]

That would be very cool!

[@bdog4u2]

I hate how kawasaki puts the oil seals inside the crankcase. Have to take everything apart for a stinking seal

[@kurthcrew9117]

Amazing 🤘🏼

[@franklinlatour2655]

What paint did you use on the motor

[@Bradybrandwood]

The engine paint was VHT High Temperature Engine Enamel,… from AutoZone. ✌️✌️✌️

[@franklinlatour2655]

Thanks how about the frame

[@TylerVance1776]

What did you use to get the Flywheel off??? I just took the magneto out of mine but cant get the crank out without removing the flywheel

[@Bradybrandwood]

Hey KV, I used a wheel puller,… and heated the spindle a bit with a torch. ✌️✌️✌️

[@opdanky236]

what is the carburetor you use on this build i cant seem to find one that works good like exact name if you could if u remember

[@Bradybrandwood]

Hi the carb is a Mikuni 34mm round slide carb. You can get them on EBay or at DC Plastics ✌️✌️✌️

[@opdanky236]

@@Bradybrandwood but there like VM34-275 and vm34-168 is there a certain one you used

[@jamesswetland5019]

I just bought the same carb you put on your Honda CR250R Elsinore. What size jet did you put in to rich it up? Thanks

[@Bradybrandwood]

I just checked through my records and it looks like I bought a 340 main jet for the 34mm Carb for my Elsinore. The 1978 CR250 only got an air screw adjustment and a needle clip position change.

[@jamesswetland5019]

@@Bradybrandwood in your video you said it was a 36mm carb. That’s what mine is to.

[@Bradybrandwood]

@James Swetland Yeah I don’t think I did a jet change on the 36 mm carb though. I have two of them, and they were very close right out of the box.

[@jamesswetland5019]

@@Bradybrandwood I’m putting mine on tomorrow. I’ll run it & see what happens. Great bike!!

[@richardstremlow6075]

What did you used to pull the fly wheel off

[@Bradybrandwood]

I used the same wheel puller that is seen during the splitting of the cases scenes. With some WD40 and a heat gun. ✌️✌️✌️

[@robbiemckinnon7901]

if you have an bearing supply house near you, like a warehouse in an industrial area kind of place, take in the old bearings in and have them match them up. It'll save you some Ebaying and waiting on shipping.

[@robbiemckinnon7901]

they can also get you the oil seals just based off of the dimensions on the old seals.

[@trapbby8796]

Having a hard time removing the flywheel any advice how did you do it really need help thank in advance!

[@Bradybrandwood]

Hey yeah I had a hard time too. I sprayed WD-40 on it and let it soak, and used a 2 arm flywheel puller,... and slowly tightened that down while I heated the crank spindle with an electric heat gun,...

[@rexmcconnell6235]

Can you direct me to where you got all of the parts for this bike? I just picked one up and I found a lot of the stuff I need but not all

[@Bradybrandwood]

Yeah I had to search various places, and google part numbers. A lot of stuff I found on eBay too. ✌️✌️✌️

[@cloutdoors5674]

Just picked up a really good condition 1990 kx 125. Starts right up and idles good but 1st and 2nd gear have very little power. 3rd gear the power finally kicks in but still not like a 125 should. Im not the most mechanically inclined guy but i can take instruction. Any suggestions for a good place to start would be appreciated. Im going to start with easiest stuff first like changing the spark plug and cleaning the carb. What should be my next check after that?

[@AlejandroLopez-ek4ci]

Hi, can you tell me the number of the bearing crankshaft?

[@Bradybrandwood]

Yes they are 90245-1134 & 90245-1024

[@ninem12]

Hi, I was wondering if your bike requires a secondary movement after either shifting up or down to return the shifting mechanism back into position to make the next change? Example: after shifting from 2nd to 3rd I have to lightly press the shifter down in order to perform another shift... Thanks for the video; It was extremely helpful!

[@Bradybrandwood]

Hi, no it should re set on its own. You may have the return spring in the wrong position, or something too tight and binding preventing your shifter from returning to center. Also check to see that the shift drum is in correctly. ✌️✌️✌️

[@ninem12]

@@Bradybrandwood Thanks for the quick reply. Glad to hear it's not just a design flaw. I will check it out.

[@linewater2690]

Did you ever find those ducks?

[@Bradybrandwood]

No, I looked for a while. I never saw them come up. They were a distance from where I was though, so hopefully they did.

[@linewater2690]

@@Bradybrandwood oh ok. Ty for responding

[@AfterTheTrib]

Hey Brady I am rebuilding a 1984 kx125 and would love to get with you about somrthings.

[@Bradybrandwood]

Hey Adrian yeah you can message me on Facebook or e-mail at [e-mail]

[@trapbby8796]

Working on rebuilding the same bike could I by any chance get links too all parts please exept piston and cylinder thank you

[@Bradybrandwood]

If you go online to one of the parts warehouses, and click your way to KX 125 you should get a schematic of all of the parts on the bike which will give you part numbers and details on what you need to replace. You probably won’t be able to buy these parts directly but the part number will help you find replacement parts. ✌️✌️✌️

[@coreyevans5512]

Good video but I wish you showed how to take flywheel off

[@Bradybrandwood]

The fly wheel on that bike was actually loose and came right off.

[@snailie]

oof... gotta admit, somebody breaking into my garage and stealing my bikes and my tools would be my worst nightmare by far!!! I mean, I "only" dabble in Suzuki GS500E's, which definitely aren't a rare and sought for sight around here, but still... they're my babies and I wouldn't want to lose them!

[@rverro8478]

It had to be sitting for a good while if, the wrist pin didn't slide off the piston. But I know nothing about motorcycle engines so...

[@hitmanagent424]

i picked a 1985 kx125 up for $100 and it’s all messed up but it’s good project bike

[@Bradybrandwood]

That sounds like a great price. I wish you could post pictures here.

[@hitmanagent424]

@@Bradybrandwood do you have an instagram or any social media?

[@Bradybrandwood]

@@hitmanagent424 Yes, both Instagram and Facebook are listed as my name.

[@bradgrooms8124]

I have the same bike. Are you for hire?

[@madehkrmane949]

❤❤❤❤❤❤ممنون

[@slinksundew1825]

i think she busted the skirts because she tried to compress water