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+--- Thread: Low rev rattle. Should I be worried? (/showthread.php?tid=70114)
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Low rev rattle. Should I be worried? - fuzzyfazer - 29-08-14
Hi. I have a low rev rattle that suddenly appeared a couple of days ago. It disappears at about 3500 rpm. Any ideas? I'm thinking it might be the cam chain?
Re: Low rev rattle. Should I be worried? - darrsi - 29-08-14
Do a search on YouTube and compare noises.
This is probably the best cam chain noise video, when he stops revving the nuts off it.
https://www.youtube.com/watch?v=gJRMzKLu-kY
Re: Low rev rattle. Should I be worried? - fuzzyfazer - 29-08-14
That sounds identical. I have a spare engine that I'm planning to rebuild. Any suggestions on the most competitively priced cam chain sets?
Re: Low rev rattle. Should I be worried? - MC680x0 - 29-08-14
might be the tensioner.
rev the arse off while riding in 2nd , high as safe revs go, on a quiet road with no traffic (!) , then off the revs sharpish.
this should move the tensioner to the next notch
try this before you rebuild the engine !
Re: Low rev rattle. Should I be worried? - Frosties - 29-08-14
Or a quicker way....
Engine and ignition off whilst on the road/ driveway, stick it in 2nd, pull clutch in, go backwards as fast as your little duck feet can travel then let the clutch out sharply. This should notch the tensioner up if there's any left on it.
Re: Low rev rattle. Should I be worried? - MC680x0 - 29-08-14
(29-08-14, 09:29 PM)Frosties link Wrote:Or a quicker way....
Engine and ignition off whilst on the road/ driveway, stick it in 2nd, pull clutch in, go backwards as fast as your little duck feet can travel then let the clutch out sharply. This should notch the tensioner up if there's any left on it.
I prefer my option... Because i found it easier to get someone to push the bike backwards fast until i dropped the clutch, alas my wife complained about tyre imprints over her dress whilst lying on the road :lol
Re: Low rev rattle. Should I be worried? - Frosties - 30-08-14
Jeeeeeeeeeeeeeeeeesus H - she thought her dress was more important than the bike :eek ..................do they moan about everything ? :lol
Re: Low rev rattle. Should I be worried? - His Dudeness - 30-08-14
A bit of cam chain noise is normal. Does the noise go away when you pull the clutch in?
Re: Low rev rattle. Should I be worried? - fuzzyfazer - 30-08-14
The only thing that changes the noise is getting the revs over 3500.
Re: Low rev rattle. Should I be worried? - MC680x0 - 30-08-14
Have you tried the above and if so what happened
Re: Low rev rattle. Should I be worried? - paulchucky - 31-08-14
try this SIMPLE trick !!
put it in 2nd or 3rd without the engine running and push the bike backwards so the engine turns in reverse direction
dont need to push it far only about bikes length
it snatches and allows the auto tensioner to jump which takes up any slack in camchain
it`s simple and it works
Re: Low rev rattle. Should I be worried? - fuzzyfazer - 31-08-14
Tried the rev the arse off it. No different :-( maybe the adjuster is seized as the bike only has 20000 miles on it.
Re: Low rev rattle. Should I be worried? - MC680x0 - 31-08-14
Adjusters don't seize . more like the technique is the problem. Try the tips identified above by foccers
Re: Low rev rattle. Should I be worried? - fuzzyfazer - 02-09-14
Really? any moving part can seize. Especially when it hasn't been run in 2 years as mine hadn't before I got it on the road 3 months ago.
Re: Low rev rattle. Should I be worried? - MC680x0 - 02-09-14
I meant in normal riding. Clearly if it's been left for years then any moving part that normally has travel can seize , can, but this would require a combination of events such as air oxidising metal, lubricant dissolving away or hardening up, lots of things too numerous to mention. But I was referring specifically to the cam tensioner on a fz which I personally have never come across a seized one but if you think about where it is and what it is, this isn't surprising to me and I've had bikes , albeit not fz , bought after being garaged or neglected outside for many years, still never come across a seized cam adjuster.
More likely to be the technique being used or a worn chain with all the slack already taken up. The OP still hasn't confirmed use of all suggestions posted by foccers , as above
Re: Low rev rattle. Should I be worried? - fuzzyfazer - 14-09-14
Tweetytek
All suggestions have been tried exactly as described. As a 20 year veteran of the motor trade I've seen all sorts of "can't happen" things. Not sure if it was meant to be but I found your post condescending. People come to forums to share ideas and ask for help, not to be spoken to/about like a 5 year old. Apologies if I have this wrong. Just the way your post comes across.
Re: Low rev rattle. Should I be worried? - His Dudeness - 15-09-14
What mileage is on the bike? The chain could be stretched as far as the adjuster can go. The only way to know for sure is to take the tensioner out and check how far it's advanced. To get the tensioner out you'll have to take the carbs out which is annoying but it has to be done. Take the large centre bolt out of the tensioner first, then the two allen head bolts. Taking the centre bolt out first removes the spring pressure from the tensioner so it stays on the same adjustment notch so you can check it.
Re: Low rev rattle. Should I be worried? - fuzzyfazer - 15-09-14
Not sure about mileage as engine was swapped by previous owner :-( I have a spare engine that I'm planning to rebuild. Going to spend a day or two stripping it down and checking the tolerances. But I know that the cam chain on it is still good as I took the tensioner out last week to see what could go wrong with it and forgot to remove the centre bolt. When it came out it extended by 4 or 5 teeth so still quite a bit of movement available. As long as everything is good I'll fit the lump to the bike and see what's what!
Re: Low rev rattle. Should I be worried? - fuzzyfazer - 15-09-14
Update: Began stripping the spare engine this afternoon, checked the chain and engine timing first. Chain was less than half worn according to the amount of adjustment left over. Timing was out by a couple of degrees but nothing major. Camshafts not exhibiting any wear, followers in good condition. Head gasket not blown pistons in good order, no play in gudgeon pins or big ends. Bores smooth, no gouges or steps. Ring gaps within tolerance. Just have to separate the crankcase halves tomorrow and check the crank bearings and journals. While I'm in there going to check the gearbox out and probably replace the clutch as well. Going to rebuild with all new seals and gaskets despite the adjustment available it would be madness not to replace the cam chain and tensioner blades. Quite excited about this as not rebuilt an engine in years. Also going to give it a good paint get it looking good as well. Might even go the whole hog and paint the whole bike once it goes back together! Who knows?!
Re: Low rev rattle. Should I be worried? - MC680x0 - 15-09-14
(14-09-14, 10:39 PM)fuzzyfazer link Wrote: TweetytekSorry about that. I have no idea what your competence is , so if I'm teaching you to suck eggs in a particular domain then just frekin ignore me. Your perception is your reality but I wasn't talking to you like a 5 yr old... But as a 20 stobne heavy metal fan chain smoking tattooed headed fat bastard , I am not used to people giving me shit , I can be blunt and to the point , so maybe I do come across in a certain way but I never set out to disrespect or humiliate... So,That's my style. Once people get to know me I'm a gentle giant. Most people on this forum don't know me and I don't know them. Don't take me to heart. Glad to see your engine breakdown is going well and keep us updated.
All suggestions have been tried exactly as described. As a 20 year veteran of the motor trade I've seen all sorts of "can't happen" things. Not sure if it was meant to be but I found your post condescending. People come to forums to share ideas and ask for help, not to be spoken to/about like a 5 year old. Apologies if I have this wrong. Just the way your post comes across.