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Help What’s this bloody noise - MC22

Discussion in 'Honda 250cc In-line 4's' started by James Mclaren, Jan 5, 2021.

  1. James Mclaren

    James Mclaren Active Member Premium Member Contributing Member

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    Hey guys how do I upload a video?

    immabout to advertise a mc22, bike runs mint and is clean etc but has this awful noise at around 8000rpm

    it’s like a scream or a squeal

    get worse with rpm

    bike doesn’t have any other issue, no lack of power, starts fine, rides fine just has this bullshit noise and I don’t wanna sell someone something that may have a sinister issue

    it’s not a rattle, nor a tank rattle and it has the rank rubbers

    not the exhaust , tightened and new gaskets

    not the spark plugs they are new and tight

    dropped the oil and no shavings etc in it

    I ride the bike every day and it doesn’t have an issue but this bloody noise !

    it’s like an exaggerated cam gear noise .

    could it be a bearing in the engine gears?

    mid really like to post a video on here but don’t know how

    pic of the bike

    F4494C0F-706C-4576-BE85-B79CDA5AB2FB.jpeg
     
  2. James Mclaren

    James Mclaren Active Member Premium Member Contributing Member

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  3. gregt

    gregt Well-Known Member Premium Member

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    In gear or in neutral ? On the road or stationary ? Any particular gear ?
    Spun the back wheel and listened ?
     
  4. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    A pin hole in the bottom of the exhaust collector?
     
  5. crzie

    crzie Member Premium Member

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    Sounds like a metallic whirring sound, maybe something like you said with the cams.

    does anyone know if it could be valve tap?

    what rpm is the idle in the video?
     
  6. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Valve tap starts loud and gets louder with more revs.
     
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  7. James Mclaren

    James Mclaren Active Member Premium Member Contributing Member

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    I doesn’t matter if it’s in gear or not, it’s soley rpm related , stationary or moving the sound is the same, it’s not clutch because it doesn’t change clutch in our out.

    min the video the bike is at about 4500 rpm (choke on) trying to exasperate the noise . But it’s like a scream at 8000 rpm

    I’ll get another video today, in the phone microphone picks it up,

    if it is engine issue which I fear it might be I will pull the listing , and repair it, it’s just no one can work out what it is
     
  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    If it walks like a duck etc. Maybe someone had the head surfaced and thereby causing the cam drive gears to be too tight.
     
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  9. DannoXYZ

    DannoXYZ Well-Known Member

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    Need your AC & alternator belt replaced...
     
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  10. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    May be the power steer belt. :lolsign:
     
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  11. gregt

    gregt Well-Known Member Premium Member

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    From experience RC30's set up too tight whine right from idle. Race ones with no scissor gears rattle like f... if they're too loose.

    What is possible is a bad bearing in the gear train. If load is pushing a gear into hard engagement with it's neighbour, that sort of noise would happen.
    I've not tried to take a Honda cam gear train apart. Don't want to either. Swap in a better one and try it.
     
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  12. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Trick that a very inventive Zealander once taught me, get a long cardboard tube and put it to your ear and use it like a stethoscope to pinpoint the source of a noise
     
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  13. jmw76

    jmw76 Well-Known Member Premium Member

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    Yep. Same can be done with a long handled screw driver. Listen on the handle end of course. :D
     
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  14. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I'm guessing that someone got that backwards at some point and there's probably a video on youtube of it happening, where they topple...but I'm not game to actually search, just in case

    And yes I've seen someone pour sand straight down their throttle body throat to remove carbon buildup in their engine, then they posted the video to youtube to seek answers as to why it didn't work
     
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  15. Andych

    Andych Senior Member Premium Member

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  16. James Mclaren

    James Mclaren Active Member Premium Member Contributing Member

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    Thanks for all your replies guys

    really appreciate it, got tied up today on the track bike so didn’t get a chance to grab a video of the bike in question

    I’m
    Also of the opinion that it’s a timing gear bearing

    so I’m split with my decision as to what to do moving forward

    first option is get another head, and send it to the engine guru and get it ported etc and tidy it up

    then replace the current one knowing the new one is mint, do my clearances etc, this is to rule out a burnt valve, buggered shim, cam shell etc. whilst the head swap is going on check the mesh gear bearing for noise or play etc.

    or the other option is drop the motor out, and swap it with a motor I have that’s not noisey out of my track bike, then take this one that has this issue and give it a head to to birthday and slip it in the race bike

    finally, I’m torn about putting the bike for sale, I know it’s 30 year old and sold as is, but I’d hate to sell it and someone have a future issue and come back and say I sold them a lemon as I do give a **** about what others think!

    will post video soon
     
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  17. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Found the matching uniform
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    I know I am not helping,

    my 2c, pull the engine from the track bike which is a healthy 40hp version, drop it in the white bike, sell for mega bucks., retire on the Gold Coast with a Porsche and canal front home

    Pop the head off the white bike motor, port and polish the head, check / replace cam gear , reinstall new head gasket then put it in the race bike and get out on the track

    lots of work, but achieves the goal of a sellable bike and you get the 45hp motor in the track bike

    option 2, send it to Murdo to turbocharge
     
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    Last edited: Jan 6, 2021
  18. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    :cool:OMG - a dislike from the good doctor
     
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  19. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Recent incident & nurses & not so good memories?
     
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  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I think it may have been his slight lack of enthusiasm for an increase in his workshop time

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