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.


Thank you for the help already

All things must pass..  :'(


A few hours spent trying to get the EXUP valve to operate but it must be slightly warped - cleaned it all, copper greased it all as I always do but this time...nada!


Removed it, blanked the hole in the mounting plate with nut/bolt/washers so running on full bore now!


I wonder how many other Fokkers are riding likewise?  :biker

Ayup,
New on the forum, I've just recently done my full licence having knocked about on a 125 for the last year. Picked up a 2003 FZS600 and absolutely smitten with it.


Bit scraggy on the plastics but is mechanically sound. nether the less waiting on bits to do a full service so that I'm certain its done proper.
may be overkill but gonna change oil, oil filter, sump plug, air filter, fuel filter, plugs and caps.


Couldn't help myself and already swapped out the factory end can for a delkavic unit, luckily the bike looks to have already had stainless headers put on!


looking forward to tapping in to the wealth of knowledge on here, even if I am 20 years late to the party!

Just brought a new battery Yuasa YT12B-BS to replace my 26 year old OEM one.So now we are not allowed to fill them ourselves it has been filled in the factory and charged. But you are not supposed to let them discharge - not good for them so without a "charged on" date how do we know when it was last charged.The instructions say if below 12.4v then charge before use. I measured it at 12.84 but I am giving it a nice charge before putting on the bike, from then on it will be on an optimate type charger continually. 
Out of interest my OEM one was reading 13.1v when I took it off.So I imagine that it is shipped from Japan dry and somewhere in this country it is filled and charged.

Hi All, if anyone is having a problem with the steel T pipe on the front of the engine drop me a message. I know you can't get them anymore,as I spent ages trying to so I've had one made at work from ali

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Hi All, I've got a new project underway, second MK1 in my garage but this one I'm building into a special. Fz1 front end and R6 5eb rear. Need to have billet yoke's made for the fork's to have the right offset.

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So a new battery it is then after 26 years. I will be putting a Yuasa one on and from research it looks like its a Yuasa YT12B-BS. Not too bad price in Halford's at £62.I read that the BS means bottle supplied so I put the electrolyte in myself but halfords state "Battery comes pre-filled & ready to fit
100% maintenance free" so do they put it in at halfords or is it shipped from the factory already filled so it is not actually a BS battery ?

Out for a ride and after 35 miles I stopped for 5min and it started back up ok after 2 little presses - which is a bit unusual as normally it fires up just by looking at the start button  .
Then another 10 miles and stopped for petrol but it would not re start. Turns over perfectly fine for about 1 second and at the point it usually fires up everything stopped and three was a Brrrr sound from under the seat.Tried it about 8 times and the same thing each time.It started no problem straight away bump staring it to get home.At home I re started it 4 times without any issues at all. The Brrrr noise was like if you had a small piece of playing card between an elastic band and twisted it loads of times then let it go onto a matchbox. It sounds somewhere near the battery, I had the seat off and listened and pressing the rear mudguard plastic near the batter I could also feel the Brrrr noise.
The battery is 26 years old original to the bike and is kept on a trickle charge.  Any ideas ?Thanks     

About 14 years ago I followed some advice on here and did the rear shock upgrade, with an R6 shock made in 2008. This has to be the strongest reason I still own the bike and exported it to Germany when I moved a few years later.
Fast forward to a few weeks ago I'm down the local TUV station (think MOT) and I escape by the skin of my teeth with a pass, with an advisory on the top bush of the shock. I've now removed the shock and extracted the knackered bush only to find no one seems to supply the dam things as replacements.
I notice Yamaha don't list this bush as an individual part (where as they did for the original Fazer shock) and Ohlins are no use at all (at least online).
Can anyone save the day by pointing me in the right direction of what will work here?

Hi all,
Does anyone know the name of the dealer or any dealer/trader in Leicestershire/Nottinghamshire that collects and sells a bike for a fee?  I've lost the contact details for the one I had and can't for the life of me remember their name.