CRF450X bottom end failure – OLD Bull Trailriders

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August 7, 2011 at 11:27 pm #100304

James Rookyard
Member

Just had my bike blow up at the Yellow Mountain race. Its an 08 model I bought new. Regular oil changes but has done a fair amount of racing pony expresses and 3 Yellow mountain races and 1 Condo 750, so some high speed stuff.
It started missing, I pulled up, it was rattling and then it seized. I just pulled the top end down and there were no dramas, but the big end bearing is seized and the oil was full of brass coloured metal shavings. I will have to split it to see what else is stuffed.
Is this common in these 450’s? Is it worth fixing or what are the chances of finding a complete second hand motor to put in it?

August 7, 2011 at 11:30 pm #206537

Scott Southwell
Member

Sounds like a candidate for a CR500 engine conversion.

Sorry I no nothing else about CRF450’s.

August 7, 2011 at 11:36 pm #206543

James Rookyard
Member

Thats a thought.

August 7, 2011 at 11:37 pm #206544

Mick D
Member

The only info I could find on the site regarding a CRF450 crank is this gem. Dunno if it will help or not, it will let you know what you are up against.

It appears that they aren’t that big of a drama to rebuild.

CLICK HERE

August 7, 2011 at 11:38 pm #206546

alan
Member

just get it fixed and go again cranks are not that dear but labour to fit them is

August 7, 2011 at 11:49 pm #206547

drew
Member

CRF’s only have std crank $281.15 and stroker crank $376.15 . dunno on post though.

http://www.crfsonly.com/catalog/advanced_search_result.php?keywords=450x+crank&osCsid=7e1de71a5ee26c9289f90936fb8a9f45&x=0&y=0

if the crank it’s self is good. a rod and bearing kits aren’t over the top either. as rocket said coin for spanner time is the biggest cost factor.

August 7, 2011 at 11:50 pm #206538

Bob Dowsett
Member

Just bury it :pinch: :whistle:

August 7, 2011 at 11:50 pm #206548

James Rookyard
Member

Not to worried about pulling it down and putting it back together. New crank may be the go. Where has all the brass coloured metal come from?

August 7, 2011 at 11:51 pm #206551

Bob Dowsett
Member

Sorry that was a bit harsh

your probably in a world of emotional pain hope it all works out

August 7, 2011 at 11:53 pm #206553

Bob Dowsett
Member

jimmy wrote:

Not to worried about pulling it down and putting it back together. New crank may be the go. Where has all the brass coloured metal come from?

stab in the dark ………….Clutch area ???

August 7, 2011 at 11:55 pm #206555

James Rookyard
Member

Bob wrote:

jimmy wrote:

Not to worried about pulling it down and putting it back together. New crank may be the go. Where has all the brass coloured metal come from?

stab in the dark ………….Clutch area ???

Gearbox and engine oil ar seperate so cant be clutch can it?

August 7, 2011 at 11:56 pm #206554

alan
Member

jimmy wrote:

Not to worried about pulling it down and putting it back together. New crank may be the go. Where has all the brass coloured metal come from?

thats from the crank mate

August 7, 2011 at 11:57 pm #206556

David Firminger
Member

Not too familiar with them but most rods have brass little ends(piston pin bearing).
Good luck with it.

August 7, 2011 at 11:58 pm #206552

James Rookyard
Member

Bob wrote:

Just bury it :pinch: :whistle:

:laugh: Could have buried it on Sunday when it went bang! I was heading for a top 30 finnish:angry:

August 8, 2011 at 12:01 am #206557

James Rookyard
Member

Thanks for all the quick replies! Helped me heaps already. Now who wants to buy a one lady owner crf45ox, never been raced?
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