I just got a 1998 Fazer 600 and rode around 350km on it.
I notice there is a knocking feel on the bike at around 4000-4500 RPM. Its not possible to hear snce its only apperant when driving and the wind becomes louder. It it possible to feel through your legs, hands and butt.
I have no idea what it can be
- Knocking is not present with clutch pulled in
- Knocking is not present at low RPMs
- Knocking is not present or not feelable at high RPMs
- at 4000- 4500 RPM very noticeable constant frequency knocks
- No rattle on the cam chain at idle
- bike start easily
- No rattle when decelerating
- Bike gargles from the exhaust when decelerating, dont know if its worth to mention
What can this be??
I want to check the carburetor syncing then cleaning, maybe one piston is not getting gas and it hits a natural frequency of the bike at 4000 RPM. Next would be to check the chain adjuster. Hopefully its not the cam chain.
Was going to mention a tight spot on the chain is exactly the symptom's apart from a chain tight spot is still knocking when off the throttle -so ?
Worth checking the chain for tight spot though.
I don't do rain or threat there of. dry rider only with no shame.
19-06-24, 01:01 PM (This post was last modified: 19-06-24, 01:03 PM by kutce.)
(19-06-24, 12:41 PM)fazersharp link Wrote: Was going to mention a tight spot on the chain is exactly the symptom's apart from a chain tight spot is still knocking when off the throttle -so ?
Worth checking the chain for tight spot though.
I thought about it but disengaging the clutch makes it disappear immideatly, then I dont think that is the culprit. I'll still will check for good measure.
I found one another person had a similar sisue but at 3000-3500 RPM He solved it and wrote:
"the clutch boss spring had broken, taking out two clutch plates and the clutch hub bearing was knackered....replaced the clutch hub bearing, full set of plates and new boss spring-all back together and running fine..and no noise"
I checked the chain yesterday, I dont see any sticky links. during the ride I realized it only happens when cruising, when the throttle is on. It does not knock when decelerating. Also how can it be the chain if the knock happens at a certain RPM and not at a certain speed?
I checked the chain by pushing on the chain with my finger and feeling it maybe that wasnt correct. Of course I also visually looked at it. I realized one thing; one half of the chain sags more than the other when coming out of the front sprocket. I dont know if that would indicate any sticky chain links?
Again, the knock I at a certain rpm not at a certain speed. How can it be the chain then?
I will open up the clutch side to see if it is similar to the other person on the forum.
A simple way to check for stiff links is to run your index finger along the top of the chain, pushing down, and your thumb on the bottom, pushing up, just giving each link a twist as you go.
If anything is stiff, you'll feel it.
(Just *don't* try to do it with the engine running... :eek )
(20-06-24, 12:58 PM)kutce link Wrote: Hahaha of course not, the engine is off.
I also did that, no stiff link.
do I need to drain the oil before opening the clutch cover if the bike is on its side stand?
I also think there is excess oil in the bike. the window is completely full.
Checking for stiff links. use the bottom run under the swing arm and one by one grab one and hold it still and then see if the connecting one can bend up and down freely. I had the exact problem and could feel it through the left peg which was caused by a stiff link but it still happened when rolling/ coasting so it does not sound like your issue.
The full oil window could just be very slightly over which is not a problem. The only way to tell is to get someone to sit on the bike and gently tip it over so you can judge how too filled it is. Or get a syringe and a tube stick it in the filler cap and draw some out- let it settle and see where you are at.
I don't do rain or threat there of. dry rider only with no shame.
I checked the chain again like it is suggested here. No stiff links.
I am actually not sure about the mileage on the chain, it looked new but of course it isn't and there isn't a way to verify it without measuring the chain strech, because its clean doesnt mean its new.
I will check that too tonight, good point. Thank you
It look to tight.On the centre stand place you finger on under the chain directly bleow the plastic swinging arm guard. Push it up and it should just touch the plastin guard, if not its too tight.
21-06-24, 02:38 PM (This post was last modified: 21-06-24, 04:04 PM by unfazed.)
It look too tight. Put the bike on the centre stand place you finger under the chain directly below the end of the plastic swinging arm guard. Push the chain up and it should just touch the plastic guard, if it doesn'ttouch it then the chain is too tight.
21-06-24, 07:45 PM (This post was last modified: 21-06-24, 07:46 PM by fazersharp.)
Yes I second that - check the front sprocket nut.
I would say looking at the worn off anodising on the sprocket teeth then the chain and sprockets are not that old, I have the exact same set about 6,000 miles ago and mine looks about the same, here it is new
I don't do rain or threat there of. dry rider only with no shame.
24-06-24, 07:57 AM (This post was last modified: 26-06-24, 05:22 AM by darrsi.)
(20-06-24, 12:58 PM)kutce link Wrote: Hahaha of course not, the engine is off.
I also did that, no stiff link.
do I need to drain the oil before opening the clutch cover if the bike is on its side stand?
I also think there is excess oil in the bike. the window is completely full.
The chain looks very tight, and once loosened to the correct movement you really have to make sure very gradually that the wheel is straight once tightened back up If you spin the wheel backwards on the centre stand it should purr very smoothly with no clunking or biting noises from the chain. The two combined if incorrect, which is likely i reckon, could cause problems mentioned, or at least be a part of it.
You can lean the bike on the side stand only to take the clutch cover off, but do not even think about putting the bike upright for any reason once it's off And take the engine out of neutral before doing it.
(for just a standard oil level check) ON THE CENTRE STAND on a flat surface, start the bike up and let it tick over for at least 1 minute, switch the engine off and give it another minute to settle, THEN check the oil level.
If you cannot see any level there's either too much oil, which is bad, and the oil maybe old too, or another possibility is that your window is dirty and blackened out. I had my window replaced late last year while the bike was apart as i couldn't see anything for quite a while. But start the bike and do as mentioned, because it may be okay.
More people are born because of alcohol than will ever die from it.
Quick summary of the weekend:
- Chain was too tight
- Chain was streched too much and needed to be changed, the manual says max 150mm between 10 links, i had 162mm
- I thought there was too much oil, there wasnt enough oil, changing the oil filter tonight, will top up the oil
- because oil change it tonight, ill also look at the clutch plates tonight.
If i understood correctly, i can put the bike on the side stand and just take out the clutch cover.
24-06-24, 08:56 AM (This post was last modified: 24-06-24, 09:16 AM by kutce.)
(24-06-24, 07:57 AM)darrsi link Wrote: You can lean the bike on the side stand only to take the clutch cover off, but do not even think about putting the bike upright for any reason once it's off And take the engine out of neutral before doing it.
I am not sure about what you mean?
Out the engine in gear, lean teh bike and take off the clutch cover?
Why put it in gear? Is it because its helpful if taking out the clutch plates, to stop it from spinning?
Is the Knocking gone after loosening the chain? You can changes the clutch while on the side stand and you won't loose and oil when you remove the clutch cover. If you do it on the center stand oil will pour out when you remove the clutch cover. Is your clutch slipping ???
26-06-24, 05:17 AM (This post was last modified: 26-06-24, 05:42 AM by darrsi.)
(24-06-24, 08:56 AM)kutce link Wrote: [quote author=darrsi link=topic=28051.msg334186#msg334186 date=1719212277]
You can lean the bike on the side stand only to take the clutch cover off, but do not even think about putting the bike upright for any reason once it's off And take the engine out of neutral before doing it.
I am not sure about what you mean?
Out the engine in gear, lean teh bike and take off the clutch cover?
Why put it in gear? Is it because its helpful if taking out the clutch plates, to stop it from spinning?
Thank you everyone for the help and information.
[/quote]
It's something you learn when you do it yourself, ie:me.
The centre stand is just for checking the oil level, at any normal time, simple as that.
On the side stand though the oil will lean to the left meaning you can have a look at the plates without any need to remove the oil, BUT, as i found out the hard way, as you mentioned everything tends to spin if you need to replace the plates so what you don't do is raise the bike upwards to put it in gear, as guess what.....the oil tends to all fall out on the floor!!!
