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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Shagged Big End, Options?
Post Info TOPIC: Shagged Big End, Options?
asap88


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Shagged Big End, Options?
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So I just replaced the piston rings and cam chain on one of my TTR's that had a little rattle in the (so I thought) top end.
 
At the time there was little to no play in the big end so was left as it was. Few rides later and the noise that never left was back and at the first oil change the (after 2 hours ridding) the filter was full of that stuff you never want to find in a filter.
 
Anyway engine is on the bench atm head is off and there is a **** load of movement up and down as well side by side on the crank.
 
So what should I do?
 
Pull it down get it machined? (big money in Aus)
 
look for a new bike and use the old as spares?
 

 

Any other suggestion ?

 

 



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TTRfan


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Sorry to hear of the problem cry

It is probably the bearing cage breaking up if you have up and down play plus bits in the filter - definitely sounds like you need a new big end!

You have already invested in your engine is it's probably worth persevering with it. Once done, your engine should be good for many thousand more miles smile

The Yamaha big end kit incliudes the big end boss as well as the beraing and a new conrod - see http://totallyttrs.com/epages/699105d9-e4cc-4b32-b236-84e72cd67f84.sf/en_GB/?ObjectID=1655063&ViewAction=FacetedSearchProducts&SearchString=conrod

An alternative is to buy a good second-hand crankshaft as, to be honest, big ends rarely fail on the TTR so there is a fair chance you could bag a good 'un.

If you were in the UK I would point you at Totally TTRs - see http://totallyttrs.com/epages/699105d9-e4cc-4b32-b236-84e72cd67f84.sf/en_GB/?ObjectID=1655063&ViewAction=FacetedSearchProducts&SearchString=crankshaft

Brian

 



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asap88


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TTRfan wrote:

An alternative is to buy a good second-hand crankshaft 

 

Had the same thought last night so split the motor and removed the old one.

Have found a new second hand one on ebay that should fix the problem now I just have to remember how it all goes back together

Cheers for the reply Brian

 



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asap88


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Well I finaly have the time to start putting bits back together can I have some help with the crank counter balancer ?
Are there marks? or do you just get the to weights straight across from each other?
The workshop manual just states to but it back together as it came apart.
Thanks

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katana


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On my XT, there was a punch mark on each gear that had to line up. See some?

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TTRfan


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Just make sure the punch marks are lined up.

Engine assembly2.jpg



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asap88


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Perfect thanks heaps.
Will post again soon with my next question
cheers to you both

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