wr125x cam chain tensioner

[Wr125Help]

I took my bike to a garage regarding knocking in the engine and they have said it's the cam chain and have quoted me a bill, but they said they cant just adjust the tensioner as it's "self tensioning" does anyone know if this is true?

Yamaha WR 125x 2010, 16,000 Miles

[xX-Alex-Xx]

Most stock tensioners (technically tensioner “lifters”) are automatic, but you can get manual ones for a lot of bikes. What did they quote for exactly? Just replacement of the part? They can go bad after a while and allow the chain to rattle, especially as you’re coming off the throttle.
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DILLIGAF

[Wr125Help]

[WD Forte]

No fuckin bike info again
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bikers smell of wee

[Easy-X]

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[xX-Alex-Xx]

What exactly did he diagnose and quote other than “parts and fit parts”?

Cam chain rattle is usually a “ball bearing in a can” noise when letting off the throttle.
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DILLIGAF

[Wr125Help]

[Easy-X]

Someone correct me if I'm wrong here but I doubt the cam chain would spontaneously snap. It could however jump a tooth leading to terrible performance and eventual lob a valve into the cylinder... which you still wouldn't want Have you being checking/changing the oil regularly?

16,000 miles doesn't sound like a lot of miles to wear out the actual chain and associated sprockets. It does however sound like the sort of time a tensioner would fail. You'd also replace the chain guides as needed if they're showing a lot of wear.
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

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[Nobby the Bastard]

Explain exactly how you did the clearances.

A cam chain should be good for close to 100k. At 16k the guides wont even be worn.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

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[Nobby the Bastard]

The guides maintain tension (the tensioner pushes against one) so the chain being loose damaging them sounds like bollocks to me.

Has the tensioner been taken out to check it's not seized?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Robby]

Certainly something is up.
Either the garage is wrong - if the performance of the bike dropped immediately after they did the valve clearances then this is possible - or the bike has had a very hard life to wear out a cam chain in 16k and the rest of the engine isn't far behind.

Of course if the chain is that stretched, it could have jumped a tooth which would explain the lack of performance. The bike should not be ridden or started in that state.

Still sounds off though. Camchains wearing out is one of those 1980s bogeyman things that is incredibly rare now.

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[wr6133]

16000..... 2nd time round the clocks?

If it was me I'd get the tensioner of myself make sure it's not just seized.

[davebike]

From my perspective as a pro we see lots of small bike wearing thing out that should last I think is oil or lack ther off mostly

I be compression cheaking engine sadly

Yes cam chains that are rattling do snap I seen lots mostly OK with aftermarket manual tensioners!
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Dave
NC750Xdct + others at work !
davebike1@gmail.com

[xX-Alex-Xx]

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[Nobby the Bastard]

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