Author Topic: Peculiar 'chuffing' noise. (Read 5647 times)

Hedgetrimmer · « **on:** 18 July 2016, 11:17:55 pm »

This has been going on for some time now, but damned if I can pinpoint it $:\$ The bike rides perfectly, and I have covered several thousand miles with it doing this. It's almost like a sawing noise, heard at lower speeds. It speeds up as the bike does, and I thought it might be pads rubbing on the discs, but it doesn't seem to speed up enough to be that, and I can see no evidence for it - discs are fine, brakes work fine. Plenty of material left on the pads. No evidence of anything rubbing on the tyres that I can see. Only does it when accelerating at these lower speeds (say 10-40mph approx), doesn't do it with throttle off. The chain has been adjusted a couple of times since I first heard it, made no difference, neither did a thorough service, which also didn't turn up any problems. It seems quite loud too.

Anyone got any clues what it might be, what to check?

unfazed · « **Reply #1 on:** 18 July 2016, 11:43:32 pm »

Is it worse in the rain?

Hedgetrimmer · « **Reply #2 on:** 18 July 2016, 11:51:14 pm »

I don't actually recall hearing it at all in the rain, but can't be sure. What did you have in mind?

unfazed · « **Reply #3 on:** 19 July 2016, 01:12:41 am »

When you hear it again pull the brake lightly to see if it gets worse or better. When I eventually changed the pads it was not as bad even though they were EBC HH, it sounds different now with ferodo pads in

red98 · « **Reply #4 on:** 19 July 2016, 06:46:59 am »

Sounds like chain related to me but recent service should of sorted that out, how old are the chain and sprockets ?...if that was me I would give the chain a really good clean, take the front sprocket cover off and degrease , clean the chain guide that sits on top of the swing arm and reassemble and lube, check wheel alignment both on the swing arm marks and a strainht edge...then a test ride...

Hedgetrimmer · « **Reply #5 on:** 19 July 2016, 09:47:50 am »

Quote from: red98 on 19 July 2016, 06:46:59 am

Sounds like chain related to me but recent service should of sorted that out, how old are the chain and sprockets ?...if that was me I would give the chain a really good clean, take the front sprocket cover off and degrease , clean the chain guide that sits on top of the swing arm and reassemble and lube, check wheel alignment both on the swing arm marks and a strainht edge...then a test ride...

Chain kit has loads of wear left in it yet, probably done about 7000 miles. It gets regular cleaning and lubing, adjustment is correct, not too tight or loose. I'll check the chain guide, but I always clean as much of it as I can with it in situ when I do the chain. I've never been one to use more than the s/arm marks for chain alignment, but never had this before on any bike. Never had the sprocket cover off myself, so perhaps time for a clean up in there anyway, can have a look about while it's off.

Quote from: unfazed on 19 July 2016, 01:12:41 am

When you hear it again pull the brake lightly to see if it gets worse or better. When I eventually changed the pads it was not as bad even though they were EBC HH, it sounds different now with ferodo pads in

I'll try that on light acceleration, when I hear the noise. They're EBC HH in the front, EBC std in the back.

The other thing I think I noticed yesterday was that on a downhill stretch under acceleration it didn't make the noise, but not sure if that was every time. Need to check that again before I'm sure.

Millietant · « **Reply #6 on:** 19 July 2016, 03:38:37 pm »

My first thought at the mention of "chuffing" was of a spark plug that was slightly loose, but if you've serviced it, then that should have dealt with it.

not experienced much else for this other than with an exhaust - loose clamping bolt (eith at the cyl head, or another joint) or even a small hole in one of the pipes.

unfazed · « **Reply #7 on:** 19 July 2016, 06:00:44 pm »

The other thing it could be is noisy wheel bearings, although that us more of a roaring sound

Exupnut · « **Reply #8 on:** 19 July 2016, 06:17:06 pm »

It could be the sound of ur ass when approaching a bend with a hedge while checking mirrors ....have u tried clenching ur cheeks on the twisty's ?

unfazed · « **Reply #9 on:** 19 July 2016, 09:05:24 pm »

Quote from: Exupnut on 19 July 2016, 06:17:06 pm

It could be the sound of ur ass when approaching a bend with a hedge while checking mirrors ....have u tried clenching ur cheeks on the twisty's ?

Hedgetrimmer · « **Reply #10 on:** 19 July 2016, 10:18:05 pm »

Quote from: Exupnut on 19 July 2016, 06:17:06 pm

It could be the sound of ur ass when approaching a bend with a hedge while checking mirrors ....have u tried clenching ur cheeks on the twisty's ?

How's that high performance NC700 working out for you?

Tried the brakes on acceleration when hearing the noise, makes no difference. I don't think it's wheel bearings - I've had one go on me on a previous bike and it was nothing like this. It gets worse as everything warms up, but had another good look round and can see nothing rubbing anywhere, no untoward vibration. Very puzzling.

Exupnut · « **Reply #11 on:** 19 July 2016, 10:25:00 pm »

Mmmmmmm.......nothing rubbing anywhere ....no untoward vibration.....very puzzling.....I think I have the answer .......it's definitely ur ass mate....UR SHITING URSELF IN THE CORNERS hehehehe.........and its RED ffs...

unfazed · « **Reply #12 on:** 19 July 2016, 10:32:48 pm »

Quote from: Hedgetrimmer on 19 July 2016, 10:18:05 pm

Quote from: Exupnut on 19 July 2016, 06:17:06 pm
It could be the sound of ur ass when approaching a bend with a hedge while checking mirrors ....have u tried clenching ur cheeks on the twisty's ?

How's that high performance NC700 working out for you?

Tried the brakes on acceleration when hearing the noise, makes no difference. I don't think it's wheel bearings - I've had one go on me on a previous bike and it was nothing like this. It gets worse as everything warms up, but had another good look round and can see nothing rubbing anywhere, no untoward vibration. Very puzzling.

Is it there if you jack up the front and spin the front wheel? If it is remove the calipers and hang them up away from the wheel and spin it again. If it goes, it's the pads/discs. It is the slow process of elimination.

NorthWestern · « **Reply #13 on:** 19 July 2016, 10:42:33 pm »

Mine had a raspy noise that was intermittent the other month. Couldn't tell what caused it when riding. Sometimes it did it when cornering but not always. Acceleration deceleration intermittent. Riding at constant speed it was fine. After giving it a once over at work I noticed my front sprocket retaining ring wedged in the frame. My sprocket nut threads had worm smooth. New nut and it's fine. I did notice spinning the back wheel in reverse made a racket but not forward...

Intentionally left blank

JoeRock · « **Reply #14 on:** 20 July 2016, 03:06:19 pm »

leaking exhaust gasket?

Grayo · « **Reply #15 on:** 20 July 2016, 03:22:22 pm »

Quote from: JoeRock on 20 July 2016, 03:06:19 pm

leaking exhaust gasket?

That was my first thought or a stripped stud.

fazer-rat · « **Reply #16 on:** 21 July 2016, 05:35:18 pm »

how soon you all forget,, this noise is normal from the transmission on gen 1 fazers when accelerating hard in too high a gear,, everyone's will do it,, get down the box and it won't happen ;-) accelerate in high gears with low revs and it will trrrrrrrr like fck, perfectly normal ;-)

Hedgetrimmer · « **Reply #17 on:** 21 July 2016, 06:27:08 pm »

Quote from: fazer-rat on 21 July 2016, 05:35:18 pm

how soon you all forget,, this noise is normal from the transmission on gen 1 fazers when accelerating hard in too high a gear,, everyone's will do it,, get down the box and it won't happen ;-) accelerate in high gears with low revs and it will trrrrrrrr like fck, perfectly normal ;-)

None of my last four did this, and this one didn't until a few thousand miles ago. It does it when accelerating gently in any gear.

I don't think it's an exhaust blow as it doesn't appear to be rev-related, just road speed. It's the same if I accelerate in one gear, or if I short shift through the box.

Today I whipped the sprocket cover off, cleaned up the gunge (wasn't that much), cleaned the chain again, properly cleaned the chain guide, and re-adjusted the chain. No change $:\$ The chain does have a bit of a tight spot now (adjusted to allow for this), so looks like new chain kit may be in order soon anyway. Still, you'd think adjusting the chain would make some difference if it were this.

Dustydes · « **Reply #18 on:** 21 July 2016, 07:26:53 pm »

Split hose on AIS ?

Des

fazer-rat · « **Reply #19 on:** 21 July 2016, 08:46:43 pm »

wheres the falcon?

sadlonelygit · « **Reply #20 on:** 22 July 2016, 10:56:39 am »

made sure your exup bolts are nice and tight

BBROWN1664 · « **Reply #21 on:** 22 July 2016, 11:19:29 am »

I had a similar thing on my FZS600. IT was down to the tread pattern on the front tyre. New tyres changed the noise.

fazerscotty · « **Reply #22 on:** 23 July 2016, 05:21:31 pm »

Have you tried staying away from train lines - choo choo

nickodemon · « **Reply #23 on:** 24 July 2016, 09:20:05 pm »

Have you got a hugger? I had a fazer 1000 with new tyres and i could hear a noise, but looked at tyres and couldn't see anything, but when i removed the hugger there were wear marks, so i lined the hugger wear marks with the tyre and there was a barely visible mark on the tyre. Once i changed the tyre to a flatter profile the noise went away. Worth a look

Hedgetrimmer · « **Reply #24 on:** 27 July 2016, 12:07:26 pm »

The rear tyre rubbing on the hugger was my first suspicion. The fact that I'd recently switched from PR2s to PR4s, and your post above, nickodemon, got me thinking that it sounds quite possible that this is what it could be. Quite likely I first started to hear it shortly after that switch, mileage covered since would be about right. Looking around it in situ, it didn't look like anything was close to the tyre (or chain for that matter), but I did continue to think maybe it was just somewhere I couldn't see properly. This morning, I took the hugger off. Couldn't see any obvious places where anything might be coming into contact with it, so took the bike out for a test spin. Well, it's definitely loads better. But, I swear I could still hear that same noise on a couple of occasions at low revs, just when accelerating gently in traffic. Tried different revs in different gears, and it was difficult to reproduce, but I'm nearly convinced it's still there a bit, although much, much less loud.

So now I'm beginning to wonder if maybe fazer-rat is right, and it could be a normal thing for these bikes, maybe some worse than others? Fact is, once I go over certain revs, I can't now hear it, with the hugger off, because the can just drowns it out, if indeed it is still there. So I'm wondering, could it be that it was there all along and the hugger actually amplified it? But hang on, when I first had the bike, I never noticed it. It's definitely something that has started in the last few thousand miles, or at least, has got to the point where I could clearly hear it in that time. I must've covered at least 15k miles on this bike before the noise first manifested itself. And it had got to the point where it was bloody loud!

Well, the test ride today was only short, 7 or 8 miles, so maybe inconclusive, need to take it out for a longer spin, get everything properly warmed up.