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Strange Rattle from the Beast

Discussion in 'Cal 1400 8V' started by PaulDavies, Jul 4, 2017.

  1. PaulDavies

    PaulDavies Cruisin' Guzzisti

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    Ok - I know Guzzi's are known for rattles and making other "charismatic noises", but my 1400 Audace (with the euro 4 emissions stuff - if that's in any way relevant) has a strange rattle and I'm not sure if its a "feature" (as in - they all do that sir) or something that needs adjustment/looking at. I'm new to Guzzi's (this is my first) so have nothing to go on. It's not getting any worse, but now it's messed with my head so much that I'm listening for it - Sometimes I imagine it's there when it isn't !!!

    I've posted a video here -

    You can hear it sounds fine at idle (this was made just after returning from a ride) but near the end when the camera moves to the RHS/front of the bike (@ 50 secs) and I rev it to about 2400 rpm, you can hear a fairly loud, "hard edged" rattle/tapping at that rpm which is not present (nearly so much) at other revs and not at idle. Is this typical?

    It also gets louder as the engine warms up but it's not that hot around here at the moment (low to mid 20's Celsius) so I doubt it's due to any kind of detonation/pinking. Some days it doesn't make the noise at all, or will start up after a ride and short stop. I can't drive around that rpm as obviously I have to go up and down the gears every time I stop. I can hear it most when my full face visor is up (for the cool air) as the sound seems to bounce off the visor directly to my ears implying it's pretty much under my face, e.g. cylinder heads, but closing my visor, I can hardly hear it at all (it's the same on my other helmet - both good full face Shoei's). I also use disposable ear plugs and I'm thinking of getting some custom ones made just because of this.

    It sounds to me like it could be tappet rattle, but I've had the covers off now three times and checked the clearances. Got back wheel off the ground, long screw driver down the spark plug hole, roate wheel for TDC and make sure inlet and exhaust are both open and the clearances are "by the book" when stone cold. I've only done 5000 Km. I also use premium fuel (91 octane around here, sometimes 94). I also use the Motul 7100 10w60 oil

    I've wrenched everything I can get to and it's all tight. I thought it might be exhaust heat shields as this is common, but I took them all off and went for a ride and it's no different. I've looked on the forums and can't see anything else that might explain it. Maybe they all just make that noise, but as I say some days it doesn't - more Guzzi character?.

    Any suggestions?

    One last thing, possibly unrelated, a few minutes into a new ride (between 5 and 10 mins) that involves stop-start traffic. I'm sitting at the lights and then there's a strange "whirring" noise starts up and the engine note changes and the revs drop slightly. I can't believe it's the oil fan, since the ride has just started and besides, I've heard the fan before and it didn't sound like that - any ideas what this might be?
     
    Last edited: Jul 4, 2017
  2. kiwi dave

    kiwi dave GT Reference

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    Exhaust pipes firmly in the exhaust ports? Perhaps a blown exhaust gasket?

    That whirring noise has to be the fan. I was thinking perhaps the fly-by-wire servo, but that would be really hard to hear.
     
  3. Harry H

    Harry H Tuned and Synch'ed

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    I just starting getting a simular noise on my Eldo. Comes and goes but usually when it's cold and goes away after a few miles and not all the time. Sounds like a rattle but everything is tight.
     
  4. PaulDavies

    PaulDavies Cruisin' Guzzisti

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    Dave - you might have nailed it. Got the wrench out again and yes, one of the nuts on the right hand exhaust port (as it comes out of the cylinder head) was loose. Stupidly I'd been focused on checking fasteners inside the head and from the exhaust tip back towards the engine, but side stepped that one for some dumb reason.

    Took nearly 2 complete turns turn to torque it up. I've been for a ride straight after and there's none of that hard tapping noise at 2400 rpm anymore, just the regular steady background clatter that you expect from a Guzzi.

    That rpm must have coincided with the resonance of the exhaust pipe which was just enough to open up a gap big enough to start a rattle at the mating surfaces.

    I'm hoping that's the end of it (fingers crossed)

    cheers
    Paul
     
    John L likes this.
  5. PaulDavies

    PaulDavies Cruisin' Guzzisti

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    Ok - so replying to myself here (1st sign of madness?). Went for a long ride over the weekend and on the way back bike developed some more rattles. Turns out 2 of the 6 bolts holding both Audace silencers onto their "hangers" had fallen out and a 3rd one was loose. Just bought a box of fifty (for $13) M8x16mm hex head bolts which should last me a few more years. Makes me wonder guys, how often do you all check your nuts?
     
  6. Trout

    Trout GT Reference

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    LOL! Each time I take a bath. (Couldn't resist)

    Use a little Loctite Blue & don't worry about it anymore.
    Both of the new Guzzi's I bought had various rattles but once tightened never came back.
     
    PaulDavies likes this.
  7. blakbird

    blakbird Cruisin' Guzzisti GT Famiglia

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    Is the strange whirring noise the oil cooler fan?
     
  8. PaulDavies

    PaulDavies Cruisin' Guzzisti

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    ...
    ....so once a month then :)
     
  9. PaulDavies

    PaulDavies Cruisin' Guzzisti

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    Well I guess it has to be - I'm at a loss to think of anything else it could be either. One of the nice things about the MG 1400 is that it seems to run a lot cooler than my last bike, an FZ1, whose fan used to come at every set of lights and smother me in hot air. I test rode a VFR1200 before that whose fan seemed to be permanently on . The 1400's (oil) fan seemed to only come on after a long ride ending in rush hour traffic. That's why I was taken aback when it came on almost at the start of the ride. Maybe it was a glitch as I haven't noticed it since.
     
  10. Trout

    Trout GT Reference

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    LOL!!! U think I bathe that often????

    Whirring noise is probably the fan.
    On my 1400 the fan almost never came on but the first time it did was in heavy traffic on a hot day & it freaked me out.
     
    PaulDavies likes this.

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