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Knocking Noise When Setting Off.


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#1 Johnspitfire710

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Posted 14 November 2018 - 10:11 pm

Hi all. New to the forum. Have a 2003 900. Recently developed a knocking/clicking noise in 1st and 2nd when setting off. May be there after that but can't hear it. Seems to come from bottom of engine. Doesn't happen when I test 1st and 2nd with the bike on the centre stand. Chain and sprockets fairly new and at recommended slack. Engine oil new using Yamlube. Thought it may be chain but it seems ok other than a little clicking when spinning the back wheel. Checking front sprocket tomorrow just in case. Has anyone heard of anything similar before.
Thanks for any help.

#2 Andy25

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Posted 14 November 2018 - 10:33 pm

Someone with Knowledge will be along shortly
But in Meantime
Have you checked your Brake pads etc?
Had similar noises in the past
Turns out the pads were coming apart
That was fun

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#3 Johnspitfire710

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Posted 15 November 2018 - 07:01 am

Thanks. I'll check them over.

#4 Matlock

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Posted 15 November 2018 - 09:16 am

I had exactly this, it was a bent tooth on the front sprocket. It wasn't massively bent, but obviously enough to cause the noise. Take it off and lie it on a flat surface to visually check, there shouldn't be any distortion. My C&S were worn anyway, so I replaced the lot. If you have a new C&S fitted recently, that's a bummer, but you may just be able to get away with just replacing the front sprocket if the C&S don't have many miles on them :good: .


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#5 Johnners

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Posted 15 November 2018 - 09:18 am

Have a bounce on the seat with the bike stationary and listen for any knocking noises - it may be related to rear suspension.

#6 Johnspitfire710

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Posted 15 November 2018 - 09:50 am

Thanks Matlock and Johnners. Suspension checked and ok. Taking front sprocket off today to check it.

#7 fixitsan

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Posted 15 November 2018 - 10:59 am

What's your oil level like ?


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#8 cobi

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Posted 15 November 2018 - 11:11 am

Scottoiler tube? 



#9 Johnspitfire710

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Posted 15 November 2018 - 11:51 am

Oil and scottoiler fine. I'm checking the front sprocket. Teeth seem fine and the nut appears really tight although I don't have a torque wrench. I am noticing slight play when I move it by hand. Not side to side but in direction of rotation. Is this normal?

#10 fixitsan

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Posted 15 November 2018 - 12:11 pm

Oil and scottoiler fine. I'm checking the front sprocket. Teeth seem fine and the nut appears really tight although I don't have a torque wrench. I am noticing slight play when I move it by hand. Not side to side but in direction of rotation. Is this normal?

 

 

No I meant engine oil level...a knocking from the bottom of the engine is a bad sign and comes after a low oil condition sometimes..... but You've got a 900 so the oil light should have warned if that was the case

 

You can get a bit of free play on sprockets over time. I can't remember if the 900 sprocket locks up tight on the shaft with the lock nut or of there is some free play. I don't think there should be any, but it might be worth taking it off to inspect the shaft splines and sprocket broaching, just to see


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#11 Johnspitfire710

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Posted 15 November 2018 - 12:24 pm

Sorry Fixitsan. Yes, engine oil level fine and changed regularly. I'll try and get a big 36mm socket and get the sprocket off soon. Need it for work tomorrow though.

#12 thelodger

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Posted 15 November 2018 - 04:18 pm

I wonder if it is worn ( compressed ) rubber shock absorbers  ( the things shaped like pieces of cake !! )  in the  rear wheel hub. Might be worth taking them all out and putting them back in a different position. 



#13 fixitsan

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Posted 15 November 2018 - 06:45 pm

I wonder if it is worn ( compressed ) rubber shock absorbers  ( the things shaped like pieces of cake !! )  in the  rear wheel hub. Might be worth taking them all out and putting them back in a different position. 

 

 

Cush drive rubbers ? Yeah it could be


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#14 divvxj

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Posted 15 November 2018 - 06:47 pm

had this on my RF900, new chain and sprockets changed that



#15 TKH

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Posted 15 November 2018 - 06:48 pm

Have yo had the rear wheel off lately? Did you remember to put the spacer in?



#16 Johnspitfire710

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Posted 15 November 2018 - 09:38 pm

Thanks for all the responses. I have checked everything. Last thing will be new chain and sprockets, even though these have only done 9000 miles.

#17 kiwistopher

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Posted 21 February 2021 - 06:23 am

I have a 2007 900 and I notice a very intermittent knocking sound coming from engine or rear shock area. Only seems to happen in lower gears and is not continuous or regular. Bike seems to run OK, but it's a bit of a worry...



#18 Studley Ramrod

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Posted 21 February 2021 - 01:35 pm

Have you checked off all of the above posts relating to suggestions matey ?  Sounds like it could be suspension related.


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#19 itchyfeet2

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Posted 21 February 2021 - 10:48 pm

I've had similar clicking and knocking. In most cases it turned out to be chain either slightly out of parallel alignment or a tight spot on the chain. Has the bike been laid up at all? Put on centre stand and slowly turn back wheel by hand, look carefully for links that are at angles to the link next to it. These could be tight links. 9000 is disappointing especially with a scotoiler but not unheard of.

 

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#20 Nig

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Posted 23 February 2021 - 01:38 pm

Same with mine - it would only knock once when pulling away -  turned out to be front brake pads moving slightly. 


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