Knock Knock Knocking :(

[Louise]

Ive just noticed when I pull away there is a 'Knock' just a single one. Been doing it for a few days. Today on the way home it knocked 3 times, as I was pulling away.
Only thing I can think of is at the tart of the month I had a bigger sized tire put on the bike and the forks dropped to being the lights back down to pass the mot. Would this cause the knock, I cant remember if it made that noise back then.
Just hoping its still safe to ride

[2t-Screamer]

thats happened to me before and it was a knackered big end bearing (i could feel the knocking through the footpegs), im not saying it is that but you don't want to be riding the bike if it is.

[st3v3]

As above, although ANY fractionth of a millimeter movement in that bit could cause a knock(ing), get it checked out ASAP, would you want it to possibly get you stranded say.. 40 miles from home as a dead weight with recovery fee's etc?
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[Louise]

Im so tired I didnt notice


I got all day tommorow at work, Monday so Wed morn or friday is only time I can get it looked at.
Is it a big job (If it is the big end) Rough estimate of the job ?

Ifs its too much I wont bother, I really dont want to spend anymore on this bike as im not keeping it.

[st3v3]

If it's the big end it's one of the biggest jobs you could have.

Next owner would most likely endure the fix in that case, don't envy them.
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Roger wrote: Women don't get damp for clingy puppies. Get some better happy pills, hit the gym & buy a medallion the size of a dinner plate. Job done

[mr jamez]

[Ichy]

Big end bearing make a constant knocking sound, getting louder as they get worse.

Can you safely lift the front wheel off the ground? if you can then give the front end a good inspection, pull it about a bit see if anything is loose. Loose forks, wheels or headstock bearing can make knocking sounds as can loose cables hitting other bits.

Spin the front wheel, put the brakes on a few times and do the same, spin the wheel backwards and forwards. Brake pads can move around in the calliper and make a knocking sound.

[Ariel Badger]

If you ever have a big end go there is no mistaking it. The entire bike feels like it is being hit with big hammers by angry chimps. Try to isolate the noise, with engine cut lift the back end and turn the wheel if you can not locate it at the back do the same at the front end. Could be, chain, brake, bearing, speedo drive, clutch etc.
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[Nb]

Get your fork bolts checked again, also make sure your chain is ok.
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[ms51ves3]

Have you checked your chain tension?

[Walloper]

Big end 'knock' will be more noticable when you increase the engine RPM in neutral. As you let go the throttle you will hear any worn 'Big End' clattering. Not so much of a clunk at first more like knock.
(Onomatopea in such matters though is of no real significance.)

Sure fire way to tell easily is to:
1) Buy a new engine oil filter.
2) Drop the oil from the sump into a clean container. (So you can re-fill after.)
3) Remove the oil filter.
4) Install new filter and re-fill with oil (IF THE OIL IS GOOD AND NOT FULL OF METAL).
5) ***WARNING*** SHARP EDGES, PAY ATTENTION TO YOUR FINGERS. BETTER TO WEAR HEAVY GLOVES. Hacksaw the old filter open and rip some of the paper filter element out.
6) Open the pleats and look for bright metal particles.
If the 'Big End' is gubbed then it will show in the filter.
Good luck.
Phuquedtifano what the other cause of the knock could be...
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[smegballs]

i had a knocking when i pulled off on my Turned out that the chain was way loose and throwing itself around everywhere. Re-did chain tension and bike was right as rain, for thew next 200 miles....

[Blau Zedong]

I don't believe for a nanosecond an SV650 has thrown a big end, unless it's run out oil. I would suspect something loose chassis or chain wise first.
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[Kickstart]

Hi

Can you say where the knock feels like it is coming from. How harsh a knock it is?

Loads of things can give what feels like a knock. Tight spot in a chain that has been adjusted too tightly for example, but likely to be felt most through the footrests.

All the best

Keith
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[Whosthedaddy]

Turn on bike
Get a long screwdriver, phillips or flat head your choice
Put the screwdriver to your temple
Put the screwdriver onto various engine casings to isolate the 'knocking' (its a cheap version of a stethoscope).

My ZX has a small rattle at slow speeds, I know its not from the engine so check the wheels and brake pads for any loose play.
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[Louise]

I will check out all of above today.
Oil issue is, Ive put some in but I cant see any in the window. I havnt a center stand so I double check by having someone else there. Still no Oil is showing, Ive put in over half a bottle.
The Knock seems to be from the front end.
Will report back later

[Damon]

could it be the bearing in the headstock? lift the front and see if there is any play in the front end. TBH i do not think its the big end bearing.

Checked pads in calipers, squirrels in radiators etc?

[Ichy]

Lean the bike right over to the left while watching the sight glass. Then slowly lift it back up. Sometimes with new oil its hard to see especially if its filled all the way up.

[Louise]

Still not had time to check it. Once I get to work today I will get someone to lean the bike over.
Kickstart - the Knock isnt really harsh but, its after I pull away (Not from standstill) if that makes sence.

Another problem, not sure if its from the same source or not, just comming home it started to back fire from the can, then I could hear it pop underneath and didnt really want to pull in 2nd 3rd gear. From a quick look last night everything is bolted on tightly.

I really dont want this thing to seize on me, and I cant see it should as I have put oil in there How will I know if its about to seize? Or dont you

[Barry_M2]

Could be a loose exhaust bracket (at the head) that's rattling, which would in turn cause a leak and would explain the slight backfire.


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[Keir]

clutch ok? could worn clutch springs make the clunk when you pull away?
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[BFG]

Ahem

[Kickstart]

[Louise]

[Kickstart]