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November 22nd, 2020, 09:12 PM   #1
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No compression situation figured out

So I was out for my first ride on my new to me 2009 FE570 on Saturday. 20 minutes into the ride the bike just dies and has no compression. I figured out today that the intake valve rocker seized onto the shaft, Iím guessing from lack of oil. Apparently this is a fairly common issue unfortunately.
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November 22nd, 2020, 09:30 PM   #2
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Pictures of the shaft and fork

Was tough to pull out, didnít do too much damage
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No compression situation figured out-img_nov222020at102742pm.jpg   No compression situation figured out-img_nov222020at102604pm.jpg  
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November 23rd, 2020, 02:07 AM   #3
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thanks for the heads up. Good of you to share.

Taffy
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November 23rd, 2020, 05:12 AM   #4
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Does anyone know if there is a good modification to prevent this from happening again? My understanding is KTM released an updated version of the shaft with a little flat on the top side for the 500EXC motors that use the same head. I don’t know if it would make a difference on the 70 degree ‘Berg because of the head angle (the flat would be at the wrong spot)
From the reading I did, it was caused by clogged oil screens (there are 2 of them in the system), I will investigate if that was my issue as well. According to the last owner Oil and filter were just changed and new clutch installed. I will take the screens and filter out to see if they are plugged. One other person had his screens plug off with clutch fibres after a clutch change.
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November 24th, 2020, 04:25 AM   #5
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Do you know how many hours / miles were on the bike ? Are the parts still available to repair it ? hope it’s back on the trails quickly
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November 24th, 2020, 05:45 AM   #6
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It has 32 hours on the motor. A recluse clutch was installed just before I bought it with zero hours on it. I found the oil screen was plugged with a black gritty material that feels like shaved hard plastic, I wonder if it is from the cam chain slider because it has a manual chain tensioner installed instead of the stock hydraulic one. If it was set up too tight, would the chain shave down the guide? I donít know. I donít know where else this type of material would come from. The oil looked new and I took apart the oil filter, it was clean.
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No compression situation figured out-img_nov242020at63630am.jpg   No compression situation figured out-img_nov242020at63705am.jpg   No compression situation figured out-img_nov242020at63732am.jpg   No compression situation figured out-img_nov242020at63802am.jpg  
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November 24th, 2020, 05:48 AM   #7
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Luckily the head is the same as the one used on KTM 500 EXC/XC-W, so yes parts are readily available. I am going to put fresh oil in it, run it for 5-10 minutes and drain it again, then check the screens and see if there is still this mystery stuff coming out
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November 24th, 2020, 10:18 AM   #8
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There's still another screen at head. Did you clean/replace it. Each time you change the oil check/clean the screens and of course replace the oil filler

Last edited by Rainerio; November 24th, 2020 at 10:32 AM.
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November 24th, 2020, 11:12 AM   #9
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Thanks, yes the screen at the head was clean, I am still trying to figure out what was plugging the lower screen.
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