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TTR 250 noisy engine/top end

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Joined: 29 Sep 2006
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PostPosted: 18:41 - 04 Oct 2014    Post subject: TTR 250 noisy engine/top end Reply with quote
Hi

I stripped the top end a few weeks back trying to find the cause of a rattle in the engine. This lead to me replacing the piston and rings/rebore which was needed.
It got rid of a bit of the noise (no more piston slap) but it still wasn't right.
Since then after a few more strip down -rebuilds i have replaced the timing chain and the tensioner. This has got rid of the main chunk of the noises but there's still this tapping sound...

https://www.youtube.com/watch?v=wbEWaxplkH4&feature=player_embedded

Valve clearances are all spot on and the valves have been cleaned and lapped in with new stem oil seals.
Cams are rotating freely and the cam journals look fine.
I didn't change the timing guides as they looked fine but pretty much everything else up top has been checked/replaced...


A few different bike shops have told me it different things...
1. says it's the springs on the back of the clutch basket rattling.
2. said it's the timing chain tensioner (now replaced that aswell)
3. said it was valve guides
4. said it's the little end (new conrod needed)

I'm including a video of the clutch basket and the little end pin movement as i'm not sure how much movement is normal Laughing
Appreciate any advice Thumbs Up

https://www.youtube.com/watch?v=VaSFe5qzYOU&list=UU_Iwk9On4Zx51EyCYJcUSDQ

https://www.youtube.com/watch?v=8OWEeMM7GJc&list=UU_Iwk9On4Zx51EyCYJcUSDQ

https://www.youtube.com/watch?v=46wO9TvBElo&list=UU_Iwk9On4Zx51EyCYJcUSDQ

https://www.youtube.com/watch?v=yXGbuoFd_BE


All attached pics are from todays stripdown.
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Vincent This post is not being displayed because the poster is banned. Unhide this post / all posts.

moonzoomer
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Joined: 01 Jul 2012
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PostPosted: 21:48 - 04 Oct 2014    Post subject: Reply with quote
Possible camshaft end float, just a thought
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PostPosted: 23:45 - 04 Oct 2014    Post subject: Reply with quote
Vincent wrote:
First impression is cam chain rattle. What's the mileage?


It does sound like it but I've replaced the chain and tensioner (both genuine Yamaha)

There's plenty tension on the chain and the timing marks line up perfectly.

Mileage is 3000kms on the clock. The mot history tells me it had 870ish kms back in 2010 at which time the bikewas 10 year old 😳
So no idea really lol
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Last edited by ---- on 00:15 - 05 Oct 2014; edited 1 time in total
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Joined: 29 Sep 2006
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PostPosted: 23:55 - 04 Oct 2014    Post subject: Reply with quote
moonzoomer wrote:
Possible camshaft end float, just a thought


Just googled that... With the cams bolted down I can move them side to side by probably .5mm maybe more.Never even thought it was an issue at the time so I'll double check that tomorrow.

Thanks
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----
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PostPosted: 00:11 - 05 Oct 2014    Post subject: Reply with quote
I've been googling valve stem to guide clearance as o remember at least one exhaust valve having quite a bit of wiggle just before being seated. It seemed that when I closed the valve I could close it off centre slightly by pushing it sideways and in. A little more pressure and it kind of clicked fully closed.

Hope I've explained that right. Could this cause this kind of noise?

Thanks for the replies 😄
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bugeye_bob
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Joined: 05 Sep 2013
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PostPosted: 06:54 - 05 Oct 2014    Post subject: Reply with quote
https://ttr250.activeboard.com/t58433846/rattly-top-end/
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Old Thread Alert!

The last post was made 11 years, 88 days ago. Instead of replying here, would creating a new thread be more useful?
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