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LOUD whirring noise

Discussion in 'The Garage' started by Q Tip, Mar 14, 2012.

  1. Had the bike out for a little ride just now, nothing over 6000 rpm, and pull up to a stop sign and hear a loud whirring noise with a hint of a rattle over the idle, bike is still running.

    Ease her back to the house and standing there listening around for a half minute and she cuts off. Motor not stuck.

    I've had an oil leak from the top of the head but nothing major. Also found just a few flecks of cam chain tensioner black plastic in the oil the first time I changed it.

    Any ideas? Kinda bummed this would happen right at the start of good riding weather but at least it won't be too cold to work on her.
  2. 5twins

    5twins XS650 Guru Top Contributor

    Well, the first thing I'd look at is the cam chain adjustment. Start the bike, let it idle, and watch the movement on the plunger. It should bounce in and out slightly about 1 or 2mm. If it doesn't move at all, you've got it set too tight. Play with the adjuster a bit while it's running to see if you can eliminate the clicking and whirring noises. Just make sure the rod has some movement when you're done.
  3. I know it's pretty impossible to diagnose this without hearing it. The cam chain was set correctly not to long ago. I'll try to crank it and get a video later. thanks for the reply.
    It's loud and sounds pretty major.
  4. Good news! Turns out the starter button was stuck "on". Back on the road!
  5. Tron

    Tron Bearded Sheep Whisperer

    I think someone put a turbo on your ride without you realizing.

    Damn russians
    thuban likes this.
  6. Willy D

    Willy D XS650 Member

    I've got a 79 with similar whirring kinda tinny sound coming from my front end goes up/down with rpm head came loose started leaking a bit I re-torqued adj valves noise still there bike still runs strong but I think noise is getting louder any suggestions?
  7. fatman61

    fatman61 XS650 Member

    rattle noise help. Bike rattles intermintantly when riding, however, not when pulling a hill or in neutral at any rpm's any idea's thanx

    Attached Files:

  8. thuban

    thuban Horse Scratcher XS650.com Supporter Top Contributor

    Last edited: May 19, 2020
  9. MaxPete

    MaxPete Lucille, Betty, Demi & Gretel: I ask, THEY decide. XS650.com Supporter Top Contributor

    Shut the engine off - works to quell funny noises nearly every time. Ooopps - sorry - being snotty again. ;)

    Glad you got it sorted out.

    Team Junk likes this.
  10. fatman61

    fatman61 XS650 Member

    sounds like some type of free play. can wind it out up grades with no noise, c'mon guru's
    MaxPete likes this.

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