thelonewonderer Posted January 9, 2015 Share Posted January 9, 2015 Hey all! I have a 2003 V11 Sport. It has just over 18k miles on it. I did the scheduled maintenance about 2-300 miles ago. Riding home from work the other night, I became aware of a knocking sound. It seems to have started suddenly, as I didn't notice anything until that ride, and it is my daily rider. It doesn't knock while idling, but from 2k RPM and up, the knocking is very noticeable. I'll see if I can upload a video where the sound can be heard. I've changed the spark plugs and searched all over for anything loose, externally, but no luck. I know this isn't much to go off of, but does anyone have a thought or two?? I would consider anything helpful! Link to comment Share on other sites More sharing options...
moto fugazzi Posted January 9, 2015 Share Posted January 9, 2015 A sound file would be very helpful. Is it a low pitch or a high pitch knock? What oil did you use on the last oil change (just out of curiosity)? Ken Link to comment Share on other sites More sharing options...
Zooter Posted January 9, 2015 Share Posted January 9, 2015 Does changing gears change the knock frequency? Link to comment Share on other sites More sharing options...
docc Posted January 9, 2015 Share Posted January 9, 2015 My recent knock turned out to be a bad wheel bearing. Wheels Off Maintenance Checklist Link to comment Share on other sites More sharing options...
thelonewonderer Posted January 9, 2015 Author Share Posted January 9, 2015 A sound file would be very helpful. Is it a low pitch or a high pitch knock? What oil did you use on the last oil change (just out of curiosity)? Ken Here is a link to the sound. https://www.youtube.com/watch?v=h869ANKhGR0&feature=youtu.be I used Red Line Synthetic 10w 60. Link to comment Share on other sites More sharing options...
thelonewonderer Posted January 9, 2015 Author Share Posted January 9, 2015 Does changing gears change the knock frequency? Changing gears doesn't change the knock frequency. I should also note that the knock is there with and without the clutch engaged. Link to comment Share on other sites More sharing options...
Zooter Posted January 9, 2015 Share Posted January 9, 2015 Does changing gears change the knock frequency?Changing gears doesn't change the knock frequency. I should also note that the knock is there with and without the clutch engaged. I was going to say driveline, but then looked at the vid. Link to comment Share on other sites More sharing options...
Zooter Posted January 9, 2015 Share Posted January 9, 2015 The frequency staying with roadspeed doesn't tally with it being there when clutched on stationary bike. Link to comment Share on other sites More sharing options...
thelonewonderer Posted January 9, 2015 Author Share Posted January 9, 2015 The frequency staying with roadspeed doesn't tally with it being there when clutched on stationary bike. The knock is there when clutched while riding, as well. Link to comment Share on other sites More sharing options...
Zooter Posted January 9, 2015 Share Posted January 9, 2015 If I developed such a racket I'd be scared of breaking down badly. If you really want to self diagnose it you're going to need much better help. Might I suggest checking your valve clearances, just for something that doesn't require starting it up again. I got a feeling something has let go a lot deeper in the motor though. Link to comment Share on other sites More sharing options...
Zooter Posted January 9, 2015 Share Posted January 9, 2015 The frequency staying with roadspeed doesn't tally with it being there when clutched on stationary bike.The knock is there when clutched while riding, as well.yes, but I'm working on the theory that a noise which stays same in two different gears at same roadspeed comes from after the gearbox, ie driveshaft and wheels. Yet yours is present when stationary, so must be motor related. Link to comment Share on other sites More sharing options...
thelonewonderer Posted January 9, 2015 Author Share Posted January 9, 2015 The frequency staying with roadspeed doesn't tally with it being there when clutched on stationary bike.The knock is there when clutched while riding, as well.yes, but I'm working on the theory that a noise which stays same in two different gears at same roadspeed comes from after the gearbox, ie driveshaft and wheels. Yet yours is present when stationary, so must be motor related. I believe it is motor related, as well. I have recently checked the valve clearances; they are in spec. Link to comment Share on other sites More sharing options...
Zooter Posted January 9, 2015 Share Posted January 9, 2015 Before or after knocking appeared? You might like to drop the sump and see what signs are there. Link to comment Share on other sites More sharing options...
gstallons Posted January 9, 2015 Share Posted January 9, 2015 Whew......it sounds like you have a rod knocking ? What is your mechanical ability ? The oil pan needs to come off and inspect the lower end to verify. Do NOT run or ride this until you verify this noise ! 1 Link to comment Share on other sites More sharing options...
Zooter Posted January 9, 2015 Share Posted January 9, 2015 Yeah, don't wind up on the evening news having been the centre of a pileup. If it is a bigend slapping about it's only going to put more junk into the works as it breaks up, until it seizes and your crankshaft is mangled, not something you want happening while overtaking an 18 wheeler at warp9. Link to comment Share on other sites More sharing options...
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