I just picked up this (2007 reg) K6 Vee. It's (only) got 14,000 miles on the clock (You'll see that in the video), but it's running kinda rough.
I've got this crazy CLUNK
coming from, somewhere. I've captured it on video - it's very intermittent - but it can result in a stall. It also clunks while riding around at around 2500-3500RPM (a constant speed); it appears to be okay above this RPM limit. The bike stalled during a first test-ride, but the idle-RPM was set to around 1000. It hasn't stalled since, where the idle has now been increased.
This clunk was captured from a cold start to warm. It initially rev'd at cold somewhere around 1200-1300, then I gave it a blip and it increased when it was, now warm, to where it is in this video - Skip to around 25 seconds in:
happens in the video after 25 seconds - you'll hear it and see the RPM dropping slightly. I let it record longer, to see if it would happen again, but it didn't - As I said, it's very intermittent. I also had the bike in, "Dealership Mode". The TPS is indicating bang-on centre and there are no error codes present.
I will need to see if the motor does this clunk with the clutch engaged/disengaged. There is feedback in the lever and the clutch does make some noise (rattling), I guess that's some of that early-stage, infamous, "Clutch Chudder" I hear so much about.
Any advice is appreciated!
I haven't checked the throttle bodies are synced, any vacuum seals, spark plugs, air filter, or if either of the TPSes are firmly in place.
It's just that "Clunk" noise. I'm just at a slight loss. It sounds like the engine has "died" and has "caught" again. It's almost as if the fuel isn't burning during one cycle of the crank? Maybe? Possibly? That's what it feels/sounds like, since in the next cycle you're getting that pulse/explosion.
The actual fueling isn't an issue - the bike runs great above 4,000RPM - so it's definitely getting enough fuel. I had her running well above 100MPH, in various gears.
Just at or below the 3000RPM (and idling) mark it can feel "choppy". It doesn't inspire confidence when running around at lower speeds and trying to take a corner in 2nd gear; with the apprehension that the motor could stall, leaving you in an awkward situation.
I'd rather have this fixed than running around at MotoGP RPMs (in first gear), everywhere, to ensure it doesn't stall.
I'm not entirely sure if this means much, but I noticed that the left exhaust output was warm (accompanied with mist/vapour), where the right was cold (and no mist/vapour).
I imagine that's something to do with the fact that the exhausts are linked, yadda, yadda.