Under powered, over revving

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

So, im cruising down the motorway at about 60mph. I give it some beans to overtake a few cars, the bike gets to 70 and is sitting at around 6k rpm, I keep the throttle on and it revs to around 8k rpm but the bike doesnt speed up at all.

The engine is obviously revving higher but the bike isnt going faster, as if the wheel is spinning, which it isn't.

Any ideas on what is up. This has only happened today, after I have tightened my chain. Coincidence?

Help appreciated.

In before "its an SV of course its underpowered" Laughing

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Current Ride: Daytona 600

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

Go an play at taking off on a hill. You clutch may be starting to slip.

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Slipping clutch. My GSXR did similar but was very pronounced, from 70 onwards it just added a few thousand rpm but no go Laughing

Vincent · Banned Joined: 16 Oct 2006 Karma :

Yup, slipping clutch. You need to remove the plates and have a look - not very difficult but you might need a micrometer or a decent set of verniers to measure the plates and see if they're within the service limit.

You havn't filled up with any car multigrade oil recently have you?
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Space Is Deep

Rob W · World Chat Champion Joined: 09 Nov 2004 Karma :

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

Cheers guys.

The bike has felt very underpowered for a while also, related?

I've not changed the oil in a while so it can't be that, clutch it must be. Is it safe/ok to ride as I need it for work or is it best left alone till fixed?

Is it an easy fix, because I have limited knowledge and funds.
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Current Ride: Daytona 600

Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

It gets worse.. Laughing

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

Cheers, I'll check the cable first thing. Knowing my bike it's something simple like that which causes the problem.

If not I'll take it easy and await the over revving lols before parts arrive.
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Current Ride: Daytona 600

Vincent · Banned Joined: 16 Oct 2006 Karma :

Make sure you have 1 or 2mm freeplay at the bar lever too.
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Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

I've adjusted the cable at the lever end and it hasn't helped, the cable is proper stiff though, I think the casing is bunged up a fair amount. I'll try and sort that see if it helps
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Current Ride: Daytona 600

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

Old cable is shagged, new one on order.

I'm not optimistic that it will help though.
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Current Ride: Daytona 600

mysterious_rider · World Chat Champion Joined: 11 Sep 2010 Karma :

Old cable probably dragging. New cable will sort it aslong as clutch is okay. If not , change plates and springs in clutch. Thumbs Up

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

Expect it to give up at anytime and leave you stranded.
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Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

New cable in with a little help from Mikey3.

The old one was so shot that between the two of us we couldn't move it through its outer casing without the use of the clutch lever. Laughing

It feels much better though I'm not convinced it has solved the problem. I shall be able to tell in a few days I'm sure.
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Current Ride: Daytona 600

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

sgtcalle · Spanner Monkey Joined: 07 Sep 2011 Karma :

having problems similar to this myself. quick question, my clutch first started slipping when i went over a bump, do you think this points towards clutch springs/plates, rather than the cable?
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CBR600F '02
Manchester

sgtcalle · Spanner Monkey Joined: 07 Sep 2011 Karma :

that is to say, the clutch slips when i go over bumps, not i went over one bump and its been slipping ever since! Wink

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CBR600F '02
Manchester

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

numpty2 · Trackday Trickster Joined: 08 Dec 2011 Karma :

There is a fair chance it was just the cable. I had the same problem once and simply changing the cable sorted it. I was all psyched up for the hassle & expense of new clutch plates. Big smile.

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Do you not have a clutch adjuster on the engine. Mine worked on a weird mechanism that pushed a rod into the engine, this was causing the slip.

Need to have no adjustment set at all at the lever end.

Scotsman37 · World Chat Champion Joined: 17 Aug 2004 Karma :

Make sure where the the pull/push cables that are attached at the carb end where the mechanism is attached can move freely move without it scraping/catching onto anything when it turns from off to max throttle because a sliight bend in the mechanism could make it rub against something?

Also make sure your spark plugs are ok and the HT leads to them are ok showing no corrossion where the leads fit into the plug cap ends onto the spark plugs.