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July 19th, 2017, 12:17 PM   #1
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Cam chain? Piston slap? "Normal" tick?

Hi there,

Recently, I think I've started noticing a different ticking sound coming from my 2011 FS570, which has 140 hours on it, and around 9,300 km. It hasn't been ridden particularly hard by me. No long distance high revs, mostly just braaping around town cracking small wheelies. I've been on the oil and filter every 10 hours, and I am confident the guy I bought it from was the same way. Maybe it is just in my head... my previous KTM's seemed to tick quite loudly as well and I never did have a significant failure.

I've already ordered a DJH tensioner to see if that will quiet it down anyway, but in the mean time I was hoping to get some other opinions.

I have a piston, ring and gasket kit ready to be put in, but I was just hoping I could get at least until the winter. And I am really hoping I don't need to shell out another grand for a cylinder, or con rod, or crank, etc...


Last edited by topgun; July 19th, 2017 at 12:53 PM.
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July 19th, 2017, 11:30 PM   #2
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getting the cam chain tight will hep finding the problem. let us all know how that first task goes....

Taffy
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July 19th, 2017, 11:54 PM   #3
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I'd hazard a guess it's the chain. Just proceed with caution and monitor. The tensioner is a good idea, and watch the magnet / oil filter
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July 20th, 2017, 07:23 AM   #4
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Thanks guy, will definitely follow up. Also, on Berglsmergs advice, going to check valves for looseness sooner than later. I can tell you that three days ago when I last changed the oil, there were no flakes on the magnet of the drain plug.
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July 24th, 2017, 06:36 AM   #5
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My FX450 has a bit of a tick/rattle like that, esp.at cold start up. I also have the DT cam chain tensioner waiting to be installed - if you find a good write up or video on install, please post it up.

My bike does have over twice the hours of yours - so I don't think you have anything to worry about.
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July 30th, 2017, 08:28 AM   #6
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Guys,

Finally found time to dig into the valve area of my bike.

Inlet valves were in spec, between 0.10 mm and 0.127 mm.

Exhaust valves were in spec, between 0.127 mm and 0.15 mm.

However, here is a video showing some movement in my exhaust side rocker arm. Something tells me this is the cause of my louder tapping sound.



Any thoughts on next steps? Replace the whole exhaust side assemby? Remove it and just get a new bearing? I have never pressed a bearing in before, for what its worth.

Last edited by topgun; July 30th, 2017 at 08:31 AM.
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July 30th, 2017, 09:25 AM   #7
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I would be more worried about the inlet having no play. They are supposed to have some.
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July 30th, 2017, 01:36 PM   #8
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If that's the case, is there a way to loosen it a bit?
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July 30th, 2017, 05:00 PM   #9
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Not sure about the adjustment on the 70* bikes but the older bikes have a way to adjust rocker axial play.
Someone else probably knows..
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July 30th, 2017, 09:27 PM   #10
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70deg bikes use shims - you remove the cam, there should be some threads on here about it. Ktm sell them in .05 increments, harley use the same size in the V-rod and sell them in .025 increments.

Valve Clearances
there is a PDF of the harley shims and a how to.

Last edited by z351GTz; July 30th, 2017 at 09:29 PM.
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cam, chain, normal, piston, slap, tick



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