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Bikes, Hints'n'Tips => FZS600 Fazer => Topic started by: Lemongrab on 19 May 2024, 03:32:01 pm

Title: Engine Rattle
Post by: Lemongrab on 19 May 2024, 03:32:01 pm
Loud rattle (almost a knock) from the engine at all engine speeds. Quieter at idle, louder on light throttle openings, almost disappears under larger throttle openings.
I'm guessing its timing chain related. Also noticed an oil leak but the bike won't have lost much more than 250ml.
Roughly 65k miles. Thoughts?
Title: Re: Engine Rattle
Post by: Lemongrab on 20 May 2024, 08:39:16 am
Definitely more of a knock or clatter than a rattle.
Sounds like its coming from the front sprocket cover.
When you touch that area, you can feel the knock.

Does it in drive and when stationary.
Title: Re: Engine Rattle
Post by: BBROWN1664 on 20 May 2024, 08:47:47 am
What is your idle speed set to?
Title: Re: Engine Rattle
Post by: Gnasher on 20 May 2024, 08:54:41 am
Definitely more of a knock or clatter than a rattle.
Sounds like its coming from the front sprocket cover.
When you touch that area, you can feel the knock.

Does it in drive and when stationary.


Check the front sprocket nut ;)
Title: Re: Engine Rattle
Post by: Lemongrab on 20 May 2024, 05:08:22 pm
What is your idle speed set to?
Idle speed set to 1500rpm. Once the engine is hot it tends to idle at around 1800rpm
Title: Re: Engine Rattle
Post by: Lemongrab on 20 May 2024, 05:09:33 pm
Definitely more of a knock or clatter than a rattle.
Sounds like its coming from the front sprocket cover.
When you touch that area, you can feel the knock.

Does it in drive and when stationary.


Check the front sprocket nut ;)
Did cross my mind, I'll take a look.
Title: Re: Engine Rattle
Post by: BBROWN1664 on 20 May 2024, 08:38:55 pm
What is your idle speed set to?
Idle speed set to 1500rpm. Once the engine is hot it tends to idle at around 1800rpm


idle speed once warm shoulf be about 1250
Title: Re: Engine Rattle
Post by: darrsi on 21 May 2024, 06:09:39 am
Definitely more of a knock or clatter than a rattle.
Sounds like its coming from the front sprocket cover.
When you touch that area, you can feel the knock.

Does it in drive and when stationary.


I was gonna say check the sprocket, sprocket nut and chain, for wear. May even just be the rear wheel alignment out too?
But when you mention "stationary" do you mean completely still, or with the bike on the centre stand, bike in gear and the rear wheel moving?
Title: Re: Engine Rattle
Post by: Lemongrab on 21 May 2024, 06:34:05 pm
What is your idle speed set to?
Idle speed set to 1500rpm. Once the engine is hot it tends to idle at around 1800rpm


idle speed once warm shoulf be about 1250
What are the consequences of this to a carb'd engine? Running rich?
Title: Re: Engine Rattle
Post by: Lemongrab on 21 May 2024, 06:34:53 pm
Definitely more of a knock or clatter than a rattle.
Sounds like its coming from the front sprocket cover.
When you touch that area, you can feel the knock.

Does it in drive and when stationary.


I was gonna say check the sprocket, sprocket nut and chain, for wear. May even just be the rear wheel alignment out too?
But when you mention "stationary" do you mean completely still, or with the bike on the centre stand, bike in gear and the rear wheel moving?
Stationary as in bike not moving, bike in neutral.
Title: Re: Engine Rattle
Post by: darrsi on 22 May 2024, 07:19:15 am
What is your idle speed set to?
Idle speed set to 1500rpm. Once the engine is hot it tends to idle at around 1800rpm


idle speed once warm shoulf be about 1250
What are the consequences of this to a carb'd engine? Running rich?


These particular bikes do run rich as standard anyway.
How long have you had the bike? (whatever it is, you need to put the year and model under your name to give us more info)
And do you know the history of the bike, in this example when was the air filter last changed? Changing to a K&N air filter can balance the fuel mixture a bit better by helping the engine breathe more.
Title: Re: Engine Rattle
Post by: darrsi on 22 May 2024, 07:21:53 am
Definitely more of a knock or clatter than a rattle.
Sounds like its coming from the front sprocket cover.
When you touch that area, you can feel the knock.

Does it in drive and when stationary.


I was gonna say check the sprocket, sprocket nut and chain, for wear. May even just be the rear wheel alignment out too?
But when you mention "stationary" do you mean completely still, or with the bike on the centre stand, bike in gear and the rear wheel moving?
Stationary as in bike not moving, bike in neutral.


If it does it in stationary mode then your best bet is to video the sound and let us hear it, for a quicker solution.
Title: Re: Engine Rattle
Post by: Lemongrab on 23 May 2024, 04:34:45 pm
I've px'd it for a Z750.

It was a fantastic bike for 3 years and 6000 miles and happily spent a lot of time at 12,000 rpm.

SA02 L** you will be missed.
Title: Re: Engine Rattle
Post by: darrsi on 24 May 2024, 06:52:32 am
I've px'd it for a Z750.

It was a fantastic bike for 3 years and 6000 miles and happily spent a lot of time at 12,000 rpm.

SA02 L** you will be missed.


A video could've been a lot less bother  :rollin