Wheelspin or gearbox dogs on a 110k mile cbr6?

kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

I have been getting occasional events where she hits the limiter, but it does not feel like a loss of traction. It seems odd because it is in the higher gears, 4th and 5th most of the time. Almost always I will be accelerating and going up the gears, clutchless. Sometimes I get false neutrals/poping out, after changing up but does not repeat if I go up again.

Yesterday when this occured, there was the sound of chain slack being taken up as power returned to the wheel. It felt like the wheel sprung back, as it would in a highside.

Fisty · Super Spammer Joined: 11 Apr 2007 Karma :

Clutch slip.
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P. · Red Rocket Joined: 14 Feb 2008 Karma :

Fisty · Super Spammer Joined: 11 Apr 2007 Karma :

kgm · World Chat Champion Joined: 04 Jun 2015 Karma :

Another vote for clutch slip. I'd expect clutch wear at the mileage. Easy to replace.

Kawasaki Jimbo · World Chat Champion Joined: 09 Oct 2015 Karma :

My 600 used to have similar events coming off a particular roundabout onto a dual carriageway at this time of year when the roads are greasy. On the first occasion I thought it must be clutch slip because surely, with the slight lean I had on, I'd have felt a jolt if not high-sided? In fact the clutch was fine (now at 65k and still alright) and it was a no-drama event, just odd. The wheel spun up momentarily, then found grip in a smooth manner, although it felt more like a weird throttle issue. Either it happened so fast I didn't have time to respond in a ruinous way, or my all-year-round, daily-rider status back then (I've since got old and soft Embarassed

) meant I had no fear and I just rode through it. Still, I agree 110k suggests a new clutch might be in order.

Fin · World Chat Champion Joined: 27 Feb 2016 Karma :

I bought cheap clutch discs for mine, around £10 from china for the lot and they've been absolutely fine. My old ones were actually fine (at 30k mile) but was slipping due to additives I put in with the oil.

M.C · Super Spammer Joined: 29 Sep 2015 Karma :

What oil was that?

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

M.C · Super Spammer Joined: 29 Sep 2015 Karma :

Yeah I wasn't sure if he meant that or something like Castrol Magnatec but thought he'd clarify either way.

Fin · World Chat Champion Joined: 27 Feb 2016 Karma :

Kawasaki Jimbo · World Chat Champion Joined: 09 Oct 2015 Karma :

kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

Interesting. I'd say most up changes have been clutchless, so the clutch plates should only have minimal wear?

Oil Im using Euro car parts Triple QX fully synthetic for the last couple years, as it was significantly cheaper.

Clutch looks like a PITA to do. without disassembly is it possible to measure/see wear with just the cover off?
Wont do damage if I ignore it?

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

As above clutch slip. It's the right time of year for gummed up cables though so your first port of call should be service the cable and set the free-play. If you pop the cable off at the cover end you should be able to make the lever flap in and out by pushing and pulling the cable end with very light pressure.
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bikenut · World Chat Champion Joined: 21 Nov 2011 Karma :

clutch slip and cable service, he dont use the clutch, clutchless gear changes.

Changing gear by crashing the dogs is not good, dogs chipped, worn, not dovetailed anymore and "jump out of gear/false neutrals"......
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MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

It sounds like clutch slip to me too.
And at that mileage, pretty much a forgon.

Clutchless changes? Why do you think that they would 'save' clutch plate wear? Think about it... instead of taking pressure off the springs clamping the plates together, so that the plates have less load on them when the shafts try and spin them at different speeds.... making 'clutchless' changes... you leave the pressure on the plates... then boot the cogs through, and let the difference in shaft speeds spin the plates with full-engagement spring load on them when they rub.... if anything, making clutchless changes will wear the plates more rapidly, not less...

I have the feeling that it's the same clutch on the CBR6 as my CB750... lots of bits are.... in which case yes, its a PITA to replace. It's actually not that horendouse a job.... it's just the chuffing nut that holes the clutch together!!! Otherwise, its a case of dump the oil, wip out, I think six case screws to get the cover off, pull the clutch basket, undo the six M6's on the springs, remove plates, re-assemble with a new gasket.....

That nut, though is a bit of a bast. On the Seven-Fifty, I think that a couple of folk must have been in there before me, because If recall right, the nut, is an axial castle; Ie it engages on crenalations in the axis of the shaft, not from the outside, like you could undo with a C-Spanner, so you really do 'need' the Honda special tool.... I had a devils finding the right one for the Seven-Fifty, and I think that when I tracked on down it cost something daft like £30... but WELL worth it.... as said, I was not the first to tackle the thing, and some-one had had a go with a chissel.... so the nigins on the castle not were rather butchered, and the lock-wasjher had been bend over more than once or twice, and was rather chewed and the only thing really holding the not-so tight mangled nut on the shaft!!!! If doing the job again / on similar bike; I'd splurge on a new nut and washer from DSS (as I had to on that one ISTR) before I started, along with the proper nut-spanner.... make life easy and save trying to 'save' crackered old nut and washer, or wait to dinish job whilst they arrived in the post.

Otherwise, just remember to soak the new clutch plates in oil over-night, before building up the basket. It's a pretty straight forward job... other than that ruddy nut... but with the right socket? Piece of pizz I tell ya!
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Polarbear · Super Spammer Joined: 24 Feb 2007 Karma :

Another vote for clutch slip. Thumbs Up

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weasley · World Chat Champion Joined: 16 Oct 2010 Karma :

Fin · World Chat Champion Joined: 27 Feb 2016 Karma :

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

Oil in a wet clutch is always critical.
I can't understand why folk continue to ignore OEM recommendation about equipment maintenance.
Like a few folk know better than the collective knowledge and wisdom of manufacturers who sell world wide.

Of course 'friction' modifiers will affect a friction device.
😂
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

Cable was getting crusty. Oiled and replacement ordered.

Jayy · Mr. Ponzi Joined: 08 Jun 2009 Karma :

I had a clutch go 3 times on a brand new R1 a few years back.

I also felt something like what you describe happen on my RSV4 RF which is coming up to 2 years old ( was only 1 year old when this happened ) and although it kind of felt like clutch slip as well, it was actually 3rd gear dog / gear shagged.