My fzr has developed a rattling noise in the engine, my bike is a 2kr without exup so that rules out exup being the problem.....it rattles all of the the time and not only in nuetral so I figured it was the cam chain tension. I went to a mech to ask for some advice and he said you can't tighten it...from the post i've read it sounds like he's speaking BS. Could this be the problem and if so would I be able to tighten it myself or would I need a mech. to do it? How much would they charge?
The cam chain would make a rattle but it shouldn’t be noticeable when you are accelerating or have a constant load on the engine. It has an automatic cam chain tensioner so you can’t adjust it. As far as I know you can only replace it once it has worn out. If it is the cam chain tensioner or a stretched cam chain you would hear the rattle most noticeably when the bike is warm and at idle with no load on the engine. The rattle would also be a bit of a progressive thing instead of a sudden change. Check out the parts list, page 7 number 7 is the tensioner.
had a similar issue for a while now, but i only hear it at idle - kind of a clicking/rattling noise from the top-end. Pretty sure its the cam chain - either the tensioner is stuck or the cam chain itself needs replacing (hope not). I've booked it in with my mechanic to look at friday week - I'll let you know what they come up with. I trust these guys (mostly).
Ive said tis before, this happened to me but always around 7500-8000rpms. Turned out the horn was against the bracket and resonated at that rpm. Just check that and any other source before cam chain work.
Biglez is right. Often a problem is not what it seems. My oil light was coming on between 11 and 14 krpm because the electronic switch controlling the light was resonating at the perfect amount to cause it to go haywire. There are numerous things in and around an engine to cause a rattle, not just a chain. Not ruling out the possibility of the chain being whack, but check around first.
good advice, but in my case it definately ain't an easy fix like that. I've monitored the situation for a few months and had mechanics listen to the noise - consensus is its a noisy cam chain. Exactly like Ciaran explained - only appears when the engine is warmed up and at idle - has absolutely no effect on the bikes performance, but i don't like riding around with the possibility (however remote) that the cam chain may fail and completely root the engine. So i'm getting it looked at. Adnan may have a different problem - check out the options mate and you may find its an easier fix.
The GS that i bought to fix up had the cam chain tensioner fail completely. The chain was limp and when you try to turn the engine over it skips over the cam shaft sprockets. It was very lucky that it didn’t snap the cam chain or bend valves and the like. You shouldn’t hear a noise when the engine is under load if it is the cam chain, i.e. in a particular rev range. When it is the cam chain tensioner or a stretched chain it is always a good idea to get it sorted before it sorts itself out and takes the top end with it. Let us know how things work out for ya Spook.
If you need to check the chain tensioner to see if it still has any adjustment left, it is a relatively easy job. HOW TO Just remove the big nut on the tensioner (located at the centre back of the cylinder, below the carbs) which holds the two tension springs (one inside the other) in postition and remove the springs. Then undo the tensioner body from the crankcase. There are two allen head bolts holding it in position. When you remove it from the crankcase, the tensioner arm will be sticking out of the tensioner body. Note how far out it is protuding, then pull it out as far as it goes. If it only comes out 1mm or so more then it is probably time for a cam chain replacement. Lift the ratchet latch on the tensioner arm, push it all the way back in and bolt it back into the crankcase and then put the springs in and do up the big nut.
Dave - thank you for that. I copied your post into a how to section as well: see <!-- l --><a class="postlink-local" href="http://www.fzr250.com/viewtopic.php?p=13113">viewtopic.php?p=13113</a><!-- l -->
ive got a rattle that goes away as soon as you put any load on the engine, doesnt make any difference whether hot or cold that ive noticed. does this mean its time for a new cam change? <!-- s --><img src="{SMILIES_PATH}/icon_sad.gif" alt="" title="Sad" /><!-- s -->
I wouldn’t be changing any cams but take it to a mechanic and let him listen to it, don’t give him any hints and see what he says. I have never heard of a FZR stretching a cam chain *yet* so if it is a rattle from the cam chain it probably has something to do with the tensioner. It’s not urgent to get it fixed but don’t expect it to get any better.
took the bike to my mechanic, (both my brothers are ex motorcycle mechanics <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s --> very handy) he said its mostly just normal engine noise and not to worry about it.
That's a cop-out response from a mech who can't diagnose the problem, or doesn't want the fiddly job of fixing it. Mine makes the same noise at idle - coming from the front of the engine. I have been told before that it's the exup valve because the bushes that usually stop it from rattling. I actually took it out once and idled it, and it didn't seem to make the noise, although obviously it made a lot of noise due to the large hole in the exhaust where the exup would be... Anyway, it's not affecting performance, and who knows how much longer I'll hang onto the fizzer anyway...
DevilMann: So theres a noise when in neutral.. But does it go away when you pull the clutch in? That's 'normal' engine rattle from the gearbox most people can hear.
yeah i can back that up. My rattle carries on at idle regardless of whether in neutral, first, second.. clutch in/out. only goes away when i take off. No noise after starting from cold, but after a few revs or a quick spurt it kicks in. Not sure if i'm going through with the mechanic job now - looks like the little beast is sold so i may just get the RWC and move on. Caveat emptor and all that.
lol that's excatly my problem..... i hope its the exup that's rattling... but i'll give the tensioner a quick check as well.. at first i thought the horrific rattling noise is from my drive chain, but after tightening it, its still there, and only happens shortly after warming up on the road.. happens at all rpm... and gear..
I had the same thing happen to my bike soon after I bought it. Turned out there was next to no oil in the engine <!-- s --><img src="{SMILIES_PATH}/icon_redface.gif" alt="" title="Embarassed" /><!-- s --> Topped it up and it now runs perfect.
yeah, i've always made sure there is oil and coolant in my bike.... you know there are things that happened once and the memory will last a life time <!-- s:shock: --><img src="{SMILIES_PATH}/icon_eek.gif" alt=":shock:" title="Shocked" /><!-- s:shock: --> haven't got around to check out what's wrong... so busy these days ain't got time...
