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+--- Thread: Drivetrain slack (/showthread.php?tid=65479)
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Drivetrain slack - spyder - 12-09-13
Hi, I'm new to Fazers so not sure what to expect of them. Bowled over at first, now I find that whenever I roll on the throttle, there is a noticeable clunk, particularly changing up from 1st to 2nd, but also in higher gears, it's just not as noticeable then. Chain is correctly adjusted, rear sprocket fine, don't know about front, apparently the nut mod has been done (owner showed me old one). Do they all do this? Coming from an old school GSX 750 ES the power delivery seems very fierce, exacerbating the clunkiness. Do they all do this. If so, I'll get used to it!
Re: Drivetrain slack - nick crisp - 12-09-13
Just been looking at a thread in the thous section, wear on the clutch basket may be the cause of this apparently. Another place I might be inclined to look is the cush drive rubbers. Would expect these kinds of things on high-ish mileage bikes, don't know the mileage on yours?
Re: Drivetrain slack - mickvp - 12-09-13
no knocking or backlash in the gearing of my 600, so I wouldnt say it was normal, no.
Re: Drivetrain slack - darrsi - 12-09-13
(12-09-13, 10:11 PM)nick crisp link Wrote: Just been looking at a thread in the thous section, wear on the clutch basket may be the cause of this apparently. Another place I might be inclined to look is the cush drive rubbers. Would expect these kinds of things on high-ish mileage bikes, don't know the mileage on yours?
I changed my cush drive rubbers at about 39000 miles, and the old one's didn't look any different to the new one's to be honest, they're a really hard rubber.
Re: Drivetrain slack - AdieR - 13-09-13
Fazer gearboxes are clunky, whether that's the issue you have is difficult to tell at a distance.
If you haven't done it (or if there's no evidence of it being done), an oil and filter change is probably a good idea; that in itself can make a difference.
Re: Drivetrain slack - Paul - 13-09-13
If you change from 1st to 2nd at high revs say 4000 rpm and above and get a 'clunk'
But;
If you change from 1st to 2nd at low revs say 4000 rpm and below and you don't get much of a 'clunk'
It's like my fazer, which gives me more of a 'clunk' the higher the revs.
And as far as I know that's normal.
Re: Drivetrain slack - elbrownos - 13-09-13
I agree, 1st to 2nd is known to be clunky but if you change early it's not too bad
Re: Drivetrain slack - spyder - 14-09-13
Thanks for replies, it's not the clunk engaging first or changing gears so much as the snatch when opening throttle, like chains too slack or cush drive's had it. It's more obvious in lower gears, gets better the higher you go but I imagine it's still there in 5th, you just can't feel it as much. Bike's done 18,000 which isn't a lot really.
Re: Drivetrain slack - tony22 - 18-09-13
How much can you pull the chain away from the rear sprocket at 3oclock if looking at it face on?
Re: Drivetrain slack - darrsi - 18-09-13
(18-09-13, 12:49 PM)tony22 link Wrote: How much can you pull the chain away from the rear sprocket at 3oclock if looking at it face on?
I felt my bike doing this for a while when i recently had a new chain and sprockets fitted.
It's not so much a gear thing, like the clunking when changing, you feel it most if you shut off the throttle without touching the clutch then opening the throttle again which causes a snatching feeling, i s'pose similar to a rope in a tug of war.
My cush drive rubbers have been changed, my chain is adjusted correctly, so it's weird that it started after a new chain & sprockets being fitted, but it can easily be controlled by smoother usage of the clutch.
To be honest i've not even noticed it recently, so either it's settled down or i've unknowingly adjusted my riding to stop it happening?
Re: Drivetrain slack - tony22 - 18-09-13
I found mine is smoother if I'm more aggressive going through the gears, slow gear changes are clunky and fast gear changes are not
Re: Drivetrain slack - darrsi - 18-09-13
I promise not to mention Activ8......so i won't. :lol
My gear changes are smooth and fine other than the standard neutral to first clunk.
Re: Drivetrain slack - simonm - 18-09-13
Is the clunk still there if you do a clutchless change?
Re: Drivetrain slack - darrsi - 18-09-13
(18-09-13, 07:43 PM)simonm link Wrote: Is the clunk still there if you do a clutchless change?
Like i said earlier i don't think he's on about a gear thing, it's more of a chain tension thing.
I think clunk in this case is probably the wrong word.
Re: Drivetrain slack - tony22 - 18-09-13
If it feels like excesive chain whip it could be a loose front sprocket I would get the front cover off to make sure it's nice a tight.
Re: Drivetrain slack - simonm - 18-09-13
(18-09-13, 08:20 PM)darrsi link Wrote: [quote author=simonm link=topic=9859.msg102375#msg102375 date=1379529825]
Is the clunk still there if you do a clutchless change?
Like i said earlier i don't think he's on about a gear thing, it's more of a chain tension thing.
I think clunk in this case is probably the wrong word.
[/quote]
Thanks for the clarification. I'm no engineering whiz so I'm grateful to you. My theory was you could exclude the clutch if it clunked without using the clutch.
My bad.
Re: Drivetrain slack - darrsi - 18-09-13
I think tony22 has nailed the description correctly, but it felt like that straight after a new chain & sprockets so it's a bit unexplainable?
Re: Drivetrain slack - simonm - 18-09-13
(18-09-13, 10:38 PM)darrsi link Wrote: I think tony22 has nailed the description correctly, but it felt like that straight after a new chain & sprockets so it's a bit unexplainable?
Lack of lube in the chain? I think the chain may be stiff until the links have loosened o er a few miles and the lube worked in?
Still guesswork but I'd have thought a chain that had never been used could well be a bit whippy/snappy until it's bedded in. But Wtf do I know.
Re: Drivetrain slack - Dead Eye - 19-09-13
Most chains are lubed in the factory so are already covered when you put them on - not sure if there is any real bedding in process with a chain...
Re: Drivetrain slack - nick crisp - 19-09-13
I've found that with new chains, you can get an initial bit of stretch; with a few miles on it and a first adjustment it should then settle down.