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Splitting my crankcase WR250 2stroke - questions

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Posted (edited)

Hi guys & girls,

 

I have opened enough Honda and Suzuki engines in the past but a Husky engine is new for me so just to be sure... 

Pretty much everything is removed, (flywheel, clutch, sprockets) but as I need to wait on my crankcase splitter, I haven't tried to open the case itself.

Perhaps a silly question: can I leave the bolts (A,B,C) of my picture below in place while splitting the case or do they need to go? The reason I ask this, is that the hex bolt at the shifting mechanism (C) has been stripped in a previous part of it's life, so it would be great if these bolts could stay when I split the case.

IMG_20190420_180014037_ABC.jpg.afdb0518865d2386bbf4a0c5cbf91857.jpg

And what in earth is this piston rod? Something from China or something? As I've never heard of it...

IMG_20190420_183104020.jpg.d74b3fc91a1bd12f62a9c47a55a99d78.jpg

IMG_20190420_183151359.jpg.a0454cb18a124f56985d90c7e44e3caa.jpg

There is no play at the big-end so the crank should be okay... But should I swap it anyway for a known brand?

 

Thanks!

Edited by Dutch_bobber

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Go to Husqvarna outlet or motosport.com oem lookup and look at parts breakdown.  Should help a little.  You may be able to find a factory service manual online too.  Honestly I would take it all apart,  but that is just me.

 

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17 hours ago, PaulDWR250 said:

Thanks! Taiwan... How is that nowadays? I only know Taiwanese products from toys... Is it like Chinese stuff or is it more towards Japanese quality?

15 hours ago, Rango200EC said:

Go to Husqvarna outlet or motosport.com oem lookup and look at parts breakdown.  Should help a little.  You may be able to find a factory service manual online too.  Honestly I would take it all apart,  but that is just me.

 

Guess I will strip it down completly, better safe than sorry

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All bearings have been replaced but in the end I am pretty sure that the crankbearings weren't the issue... :(

The crank itself is the issue, as I could just pick it up out of the case without any pressing... The crankbearings aren't a snug fit onto the crankshaft itself, it can easily done by hand

IMG-20190430-WA0001.thumb.jpg.1832a9b8dce21ce0853accd0505a5ade.jpg

IMG-20190430-WA0002.thumb.jpg.34d3cc2d8972a8a31282f4a79761ed5b.jpg

IMG-20190430-WA0003.thumb.jpg.1b0ec1014d5622ce767614645f55013e.jpg

I can't imagine that Husqvarna intended to have the crankbearings so loose on the crankshaft itself... 

But what are my options on this 2005 WR 250? Here in the Netherlands none of the MX-shops have those crankshafts on stock (we are more into Honda and KTM here especially since Jeffrey Herlings is our national international MX pride), so I am pretty much forced towards OEM... And those prices are insane!!!

In the past I have read somewhere that a crank of a Honda (???) should fit in the Huskie WR case? But which Honda or was it another brand? 

I am open for all suggestions! 

 

Thanks! 

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