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Felix Nsr
Wed Feb 26, 2025 8:33 pm
Cigueñal NSR 250 MC18 R5K

Hola buenos dias a todos

Hablo muy poco ingles por lo que os lo pongo en Castellano a ver si me podeis entender .....

Estoy buscando un cigueñal para una NSR 250 MC18 R5K ya que el mio esta dañado y creo que no tiene arreglo.

Alguien me puede indicar si existe alguna forma de localizar uno o hay algo compatible ( no se si valdra el de la MC-21 ) 

Muchas gracias

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Rothmans_SPud
Wed Feb 26, 2025 10:59 pm


Thanks to Google translate 


Hello, good morning everyone

I speak very little English so I put it in Spanish to see if you can understand me .....

I'm looking for a crankshaft for an NSR 250 MC18 R5K since mine is damaged and I think it can't be fixed.

Can someone tell me if there is any way to locate one or there is something compatible (I don't know if the one with the MC-21 will be valid)

Thanks a lot

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Rothmans_SPud
Wed Feb 26, 2025 11:04 pm


Applebee’s engineering in Essex 
http://www.applebee.co.uk/

Or 
GT performance engineering 
https://performance-engineering.co.uk/

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Rothmans_SPud
Wed Feb 26, 2025 11:21 pm


The MC18 crank is model specific so later ones from 21 or 28’s won’t work

The two companies listed can rebuild them - I had mine done by GT and Chris had his done by Applebee. http://www.nsr250.net/forums/viewpost.php?p=109161

How broken is yours?


La manivela MC18 es específica del modelo, por lo que las posteriores de 21 o 28 no funcionarán

Las dos empresas de la lista pueden reconstruirlos - yo hice el mío por GT y Chris hizo el suyo hecho por Applebee. http://www.nsr250.net/forums/viewpost.php?p=109161

¿Qué tan roto está el tuyo?

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Andy
Thu Feb 27, 2025 9:23 pm


Hello Felix,

And welcome to NSR-WORLD.COM

We will do our best to accommodate you and help with any questions, but please note that this is an English speaking forum, and you may find responses limited if you post in Spanish. We do have a few Spanish members that visit from time-to-time that may be able to help you with local resources, so you've found the best place for help! :-)

Although an expensive option, a new MC21/MC28 crank can be machined to fit R5/6K cases, however finding someone to do it, and do it well, maybe difficult. While I have heard of cranks being machined as an assembled unit, ideally it needs to completely disassembled [which will damage the main bearings], then the webs machined to R5/6K spec, and finally reassembled [with new main bearings] and balanced. I would guess this option however, is likely to end up costing around 1200-1500 Euros. Given the increasing value of all NSRs though, this may be a worthwhile investment.

Ultimately, as Rothmans_SPud asks, it depends how bad your crank is, and if it can be rebuilt. The common failure of 89-96 cranks is the centre bearing/seal failure, and most of the time the remaining components are reusable. A crank builder will likely require a non-refundable inspection fee to disassemble your damaged crank and measure all the components. If they are within spec, an assembly fee in the UK is normally around £300-400 + main bearings + return shipping.

Note: If your crank is not suitable for rebuild (example, a big-end journal is damaged) then the crank will be returned in component parts or disposed of, depending on the company you are dealing with. Do not expect a reassembled crank to be returned if it doesn't pass inspection, but any company you end up dealing with will be able to advise specifically.

GT Performance Engineering are the best in the business, but exceptionally busy. They deal with international customers a lot though, and best contacted through Facebook: https://www.facebook.com/GT.Performance.Engineering
