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Thread: 2020 450xcf wiped cam lobe/intake rocker 35 hours

  1. #11
    Lifetime Team KTMTalk TravisD37's Avatar
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    Default Re: 2020 450xcf wiped cam lobe/intake rocker 35 hours

    Actually the flat tappet intake rockers have always been dlc coated back to when they were first used in 2013. There have been a revision or 2 on the part trying to make it more durable but the dlc coating has always been used on this part.

    I have seen this happen a few times over the years. The main reason is either lack of oil or valve lash closes up once you get to zero lash the oil gets wiped off and you end up with metal to metal contact. The damage you experienced doesn't happen as much with a roller rocker because a roller rocker rolls over the cam rather than sliding over it.
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  3. #12
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    Default Re: 2020 450xcf wiped cam lobe/intake rocker 35 hours

    Hopefully the intake rocker works. Ktm said it was the part number for the 2021 xcf. All other parts are the same so I知 just assuming it will fit and work. I値l keep an extra close eye on my valve clearances for a while once I get it back running. The exhaust side was perfect still so I don稚 think it will be a problem in the future.

  4. #13
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    Default Re: 2020 450xcf wiped cam lobe/intake rocker 35 hours

    My 18 450SXF rockers lost all DLC at about 30hrs. I removed cam and polished off the black DLC deposits. Oil sprayer is working. Valves still in spec at 70hrs. Motorex Crosspower 4t. Plan on running it until valves no longer in spec.

  5. #14
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    Default Re: 2020 450xcf wiped cam lobe/intake rocker 35 hours

    Got new cam and rocker in and valve clearances to spec. The rocker looks a little different but the cam looks the same. Changed oil twice, seems to be running fine. I値l change the oil and check the valves after the next ride.
    Attached Thumbnails Attached Thumbnails FA0DA11A-9D0D-4061-8CB4-BBAF662E3BF6.jpg   26BAD5A2-D00F-4A82-90F9-1B06A7C70A56.jpg  

  6. #15
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    Default Re: 2020 450xcf wiped cam lobe/intake rocker 35 hours

    Went riding today. I知 not sure what made the difference but it runs so much better. Quieter, and starts faster. rode single track and didn稚 stall out 1 time. That has never happened.

  7. #16
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    Default Re: 2020 450xcf wiped cam lobe/intake rocker 35 hours

    Thanks for the follow up post and pics.

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