A forum for owners of Yamaha TTR250 trail and enduro bikes!

Members Login
Username 
 
Password 
    Remember Me  
The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Shagged Big End, Options?
Post Info TOPIC: Shagged Big End, Options?
asap88


Member

Status: Offline
Posts: 14
Date:
Shagged Big End, Options?
Permalink  
 

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 ?

 

 



__________________
TTRfan


Super Guru

Status: Offline
Posts: 8607
Date:
Permalink  
 

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

 



__________________

Exeter, Devon, UK

http://www.ttr250.com  - The one and only dedicated TTR250 FAQ!  

TIP: For easy viewing bookmark the "Recent Posts" view - http://ttr250.activeboard.com/p/recent/ 
asap88


Member

Status: Offline
Posts: 14
Date:
Permalink  
 

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

 



__________________
asap88


Member

Status: Offline
Posts: 14
Date:
Permalink  
 

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

__________________
katana


Senior Member

Status: Offline
Posts: 104
Date:
Permalink  
 

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

__________________
TTRfan


Super Guru

Status: Offline
Posts: 8607
Date:
Permalink  
 

Just make sure the punch marks are lined up.

Engine assembly2.jpg



__________________

Exeter, Devon, UK

http://www.ttr250.com  - The one and only dedicated TTR250 FAQ!  

TIP: For easy viewing bookmark the "Recent Posts" view - http://ttr250.activeboard.com/p/recent/ 
asap88


Member

Status: Offline
Posts: 14
Date:
Permalink  
 

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

__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Shagged Big End, Options?


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard