Total power loss at high revs

[Andy9934]

Recently ish my YBR 125 has an issue where it completely loses power at high revs , as if the clutch had been pulled in. Upon letting the revs fall to about 4k I can open the throttle again and continue as usual.

I've only noticed it happening shortly after switching the engine (and so, only in 1st or 2nd) on but it will happen whether the engine is hot or cold.

It's not really an issue because it doesn't happen accelerating away at normal speed but I am worried it could be an early warning sign of something.
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Surrey
Honda Varadero XL125

[P.]

Does it continue to rev but the speed stays the same? Clutch slipping perhaps?

[Andy9934]

It continues to rev but the engine warning light flashes and no power is delivered to the engine so the bike slows down.

If I held the throttle on I think it would just redline.
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Surrey
Honda Varadero XL125

[Dave M]

What oil are you using?

[P.]

[Andy9934]

I was using some Mobil 10W40 bike oil and changed yesterday to Halfords semisyn 10W40. Happens with both.

Uh not sure about the light, I will try and reproduce it and count.
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Surrey
Honda Varadero XL125

[Dave M]

[Fidge]

I think It might be a blocked valve. Have a look in your manual.

[Andy9934]

It looks like it actually has the potential to do this in any gear above around 8k rpm. Redline is at 9k.

What happens is that it loses all drive and the revs shoot all the way up. I close the throttle and the revs drop off and it will pick back up as normal.
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Surrey
Honda Varadero XL125

[Pete.]

Your clutch is slipping.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Fisty]

[Ariel Badger]

FFS your clutch is slipping.
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Bikers make great organ donors, get 115 on your licence today.

[pdg]

Just a thought, maybe your clutch is slipping?
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Any and all advice given should not be followed - if you have to ask it means you don't know so get a man in to do it for you.

[Jewlio Iglesias]

I'm thinking a little outside the box here, but could your clutch be slipping?
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21:41:40 petalbriefs: look phil, I dont preach to you about bowling pins or whatever, so you stick to that and I'll stick to cars
21:38:18 Northern Monkey: chav lives in the garage with an almax on it
21:34:54 rhys99: My train got stuck in heavy traffic

[CaNsA]

Slippage of the clutch plates.

[Nobby the Bastard]

Maybe your clutch plates are slipping.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Skoot]

Clutch slippage.

[el_oso]

If you've fitted a red powerband then this is most likely slipping.

I kid I kid, sounds like clutch slip
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Duke 390
Previous: '05 XR125L | '96 XJ600S Diversion |'05 Suzuki GSXR1000 | '05 Honda CBR125-R | '97 YZF 600R Thundercat | '11 Honda CBR250
Car: Jeep Wrangler 4.0L

[Scootaloo]

You sub-frame is twisted and your chain is slack...


No. Your Clutch IS slipping.
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(CBF125 - 09) (CBF125 - 11) (CB-1 - 89) (CBF500 - 06) (Push Bike) (CB-1 - 90) (XL125 - 01) (VF500 - 83) (GPZ500 - 94) (GPZ500 - 95) (GPZ500 - 87) (XV535 - 94) (XV535 - 94) (GPZ500 - 87)

[Andy9934]

I think the clutch might be slipping. Just a hunch...

So check lever free-play and if that's fine then get it to a mechanic?

Is it harmful for it to be in this state (I won't rev it above 8k now)?
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Surrey
Honda Varadero XL125

[pdg]