Spectacular work. To have all the tools and supplies to do this kind of repair is awesome. You're an artist and gifted machinist!

nice to see...im up to fixing my crank on an old yamaha dt 125 -1984....awsome video...thanks

Oh my God! That's absolutely brilliant, great work...

It's great to see this ingenious repair to an otherwise irreparable, rare and expensive crankshaft! Your beautifully devised, engineered and installed components ensure that this crankshaft can now return the bike to the road. As a former motorcycle mechanic and motorcycle workshop owner I respect your high standards of workmanship and very well equipped workshop.

dont understand why many trueing a crank with indicators direkt over the resting point, they need to be as far away as possible from eachother, extremely wrong can look good on the indicators

A real engineer at work ,great skills 👍

I normally weld it then lathe and cut the thread . saves all the other steps and crank strength isn't compromised . interesting video anyways .

Both sides of crankcsse beaten to death and intelligently and skilfully saved at last.Good job.

I had a similar problem on a Norton International crank, but luckily it wasn't quite as bad and i could turn back to round and pick up the original thread again. Customer was virtually in tears (of joy) when i fixed it.

Perfect workmanship. The best of the best.

Tailstock needs aligning

Interesting technique. I used to turn back to clean steel and build it up with a type of rod called “ machineoweld” as I recall, then cut new threads. This looks strong and no heat affected zone.

Lol, I always thought there was a high precision method used in trueing a crank, glad to see the old faithful hammer is that method :)

How much force is such a Dowell pin capable of withstanding? Is it possible to press fit 2 50cc crackshafts together and lock them in place using a 4mm Dowell? I am building a twin and this looks like a neath way of connecting the 2. I want to 'hide' the Dowell under one of the bearings for added structure..

Центровка сделана не убедительно :( Вы измеряете круглость цапф и радиальное биение подшипников а не соосность поверхностей цапф.

I'm missing like the middle threads on a crank, had to cut the nut off. I'm thinking I'm going to try and weld onto it and recut the threads. It will either work or it will still be unusable

I lost my temper once with a cr 125 crank, when I was younger and didn’t know better 😂. Would have loved to have known you at the time. I had to buy a new crank.

Looks good. But couple of questions, 1) did you end up heat treating those threaded rods and nuts? 2) why didn’t your cut off those damaged threaded and drill a shallow centre hole and weld new threaded rod and chase with a die? Would that’ve been easier than pressing and pinning? And wouldn’t have had to cut a key way?

Great way of doing it. Can’t wait for the day I get a lath and milling machine. Happy days

Cara vc é bom demais....que trabalho excelente parabéns pelo seu conhecimento. E profissionalismo...

Nice work, thank,s

Não seria mais fácil tornear um novo?

how Nweton meter your crank saf？

Definitely thinking outside of the box. Great way to repair a hard to find crank.

How much would a job like this cost? If you would do it or if someone else would i just figured i ask becasue you have an idea of the work that goes into doing this

Hi Paul X, what is the acceptable runout for the DT125 crankshaft? If I'm not mistaken, I saw about 0.03mm when you were done. I'm about to try and align a crankshaft myself. Thanks

Mr Paul have you a job , that change big pen litle bit advanced or another word stroke up ? If you ever there is video on it?

Zastanawia mnie pomiar bicia w mieiscu podparcia wału?nie sprawdzałem ale wydaje się że zawsze wyjdzie na zero?

This is great job

Would you explain, why should you centering crank shaft in three phase?

Lol , the dial gauges are running almost on top of the rollers ! You aren’t measuring how much runout the crank has , you are measuring how oval the journals are . The rollers need to be much wider ( like on the threads ) , but I doubt they are true enough to do that .

Did not look centered to me in the end

Good job. Lot of work though for a relatively cheap bike.

Great content man, but it appears your mill and lathe both need some PM. The runout and lack of precision of those machines blows my mind

Why not make inner thread into the crankshaft?

Great mechanical engineering👍. I like it and inspiring

Is there anyway I could have you repair a crank I have that had the flywheel side threads snap off?

Trabalho magnífico de profissional inteligente!

Love your balancing tool.. 👍👍

beautiful work.....a replacement crankshaft for this item can be found on ebay for $100 .... your cost of raw stock to do the repair is about $2 .... but your labor must be between 2 to 6 hours ..... is it economical for the customer to repair crankshafts on items like this?

Damn bro...your talent knows no bounds ... never seen anything like this 😍🔝

You are simply great! The effort and patience you put on is simply amazing! I wish i had somebody like you back in my country!

Great vid!

Professional work! I'd never seen a crankshaft holder for balance like yours. Where in can buy one?

Excellent job. Thank u.

In my opinion this kind of overhauling means an immense weakening of the crankshaft. Hopefully everything (still works well.

Your work is incredible man! Love the videos

How many tons of pressure does it take to press out the crankshaft pin?

Interesting repair idea. But since you had to make new threaded sections for both side, why not make totally new inserts with the threaded section and not just inserted parts. Seems like making the thread parts was harder then making new parts with threads cut on those new parts. IDK, just asking... Thumbs Up!

Figuring in shop time it's cheaper to buy a new crank but nice repair work.

Do you do repairs for people?

I wish i have toys like yours!Good job!

May i have you permission to put a certain of this video om tiktok

How much you charge for a crankshaft repair?

Excelente trabalho de recuperação e o custo de horas e ferramental compensa ?

U have petrol or oil in your vains... damn nice this... u are a brother from a nother mother to me😘

Increible,👍👍 perfecto el mecanizado

Nice Good Information

Thanks! Nice job, weird, but nice job anyway!

Genialna robota!

j adore ce boulot c est ca que je veux faire

Great job ! Would it be possible to send you my crankshafts to refurbish them ?

Nicely done Man!

Good job but why not welding?

Good work... But purchasing new crank shaft will be more economical.

merci bouqeau

Where did you find the keyway mill ?

just one word!! Wonderful..thx

Excelente...!!! Gracias. Thanks.

I think the coast of the repair is =or+ than new crankshaft It’s great job .

Güzel işçilik tebrik ederim

Super impressed

I have to say I wouldn't leave the house except to go to the garage to work with these wonderful machines at this point there would be no reason to leave the garage! sorry honey...

Great job 👍

Nice work Paul but for me i prefer to true up a crank between centres so would need to machine the od of the material to make sure its concentric to the centre hole....just a small thing apart from that found your video interesting

Nice work, in a way. But I definitly do not agree on the pins!! You could have it more tight and use Loctite...

Precise execution possible. It takes a lot of experience. Congratulation :).

had to mute the sound, the high notes on the music hurt my ears, excellent vid tho

Where you located at?

How the F did it get damaged like that?

They beat the crapp out of that thing !

Where can I get a truing stand like yours? Excellent work!

WTF mind blown 🤯

Were your location

You decreased the strength of all shaft.

Loctite 638 stops working in 300C temperature. Plus oil in engine.... Not sure

Hi. Nice job Paul. I like the safe side with 2 locking pins. Thru running of both bearing areas is the difficult part of the work. 👍

Putting your dial gauge virtually over the pivot is just wrong. Whilst the flywheels were apart it would have been relatively easy to re-centre the shafts , then use these centres to true up. Much more accurate, for an extra 10 minutes work

Is there any way to repair connecting big end pin hole.

Good work, what material do you use to make this

the one that took that crank out of the blok mustve been wailing on it with a steel hammer , man thats as bad as i seen them

But how does a crankshaft get damaged like that?

seriously respect

How much do you charge and how can I get in contact with you

Super , good job

Sabe fazer

Love your work. The whole deal from an engineering side and technical expertise of the presentation. Music was terrific

I learned to do this when I was in school 😀

Makia mis respetos

With the music anaj