Slipping for a split second at 6000rpm in third gear only

**jrad** · 22nd June 2014, 16:04

Hi guys,

Ive got a very frustrating problem with my GN250.
As per the title its slipping for a split second at 6000rpm in third gear only then continues as normal.
Ive brought it to a mechanic and he did a full service and tune up but its still doing it although not as bad as before.
Im bringing it back to him but he is reluctant to have another look because I couldnt find anything wrong with it the first time.
It does it uphills and also on the flat and its driving me nuts and I believe it could be quite dangerous if it happened on a turn or what not.

Anyone every hear of anything like this happening or have it happen to them and was it fixable??
Id appreciate any feedback.....apart from feedback about GN250 being rubbish.
Thanks

**jellywrestler** · 22nd June 2014, 16:10

Originally Posted by jrad

Hi guys,

Ive got a very frustrating problem with my GN250.
As per the title its slipping for a split second at 6000rpm in third gear only then continues as normal.
Ive brought it to a mechanic and he did a full service and tune up but its still doing it although not as bad as before.
Im bringing it back to him but he is reluctant to have another look because I couldnt find anything wrong with it the first time.
It does it uphills and also on the flat and its driving me nuts and I believe it could be quite dangerous if it happened on a turn or what not.

Anyone every hear of anything like this happening or have it happen to them and was it fixable??
Id appreciate any feedback.....apart from feedback about GN250 being rubbish.
Thanks

what's slipping, the tyre or the clutch?

**jrad** · 22nd June 2014, 16:13

Originally Posted by jellywrestler

what's slipping, the tyre or the clutch?

Not the tyre and according to the mechanic not the clutch either.
Its as though the drive spins without transfering to the wheel.

**swbarnett** · 22nd June 2014, 16:14

Originally Posted by jrad

Hi guys,

Ive got a very frustrating problem with my GN250.
As per the title its slipping for a split second at 6000rpm in third gear only then continues as normal.
Ive brought it to a mechanic and he did a full service and tune up but its still doing it although not as bad as before.
Im bringing it back to him but he is reluctant to have another look because I couldnt find anything wrong with it the first time.
It does it uphills and also on the flat and its driving me nuts and I believe it could be quite dangerous if it happened on a turn or what not.

Anyone every hear of anything like this happening or have it happen to them and was it fixable??
Id appreciate any feedback.....apart from feedback about GN250 being rubbish.
Thanks

How many ks are on it? I had one for a while. After about 20,000km from new I'd worn out the clutch plates. What you describe is pretty much how the problem stated to make itself known.

**jrad** · 22nd June 2014, 16:30

Originally Posted by swbarnett

How many ks are on it? I had one for a while. After about 20,000km from new I'd worn out the clutch plates. What you describe is pretty much how the problem stated to make itself known.

Theres 23,000k on it.
I originally feared clutch plates alright but the mechanic assured me that if the clutch was going there would have been a lot less power going to the back wheel and the front wouldnt have lifted up when you accelerated hard.

Did yours slip on every gear at the start or just certain ones to begin with?

**FJRider** · 22nd June 2014, 16:54

Originally Posted by jellywrestler

what's slipping, the tyre or the clutch?

It's a GN250 ...

even at 6000 rpm ..

Originally Posted by jrad

Not the tyre and according to the mechanic not the clutch either.
Its as though the drive spins without transfering to the wheel.

I'm guessing it's NOT a badly adjusted headlight that's the cause ... stop using Car oil to top up the oil level ...

Clutch springs or plates (or both) is my guess.

BUT ...

It COULD be the chain jumping a cog ... ??? check chain tension / condition ...

**swbarnett** · 22nd June 2014, 17:41

Originally Posted by jrad

Theres 23,000k on it.
I originally feared clutch plates alright but the mechanic assured me that if the clutch was going there would have been a lot less power going to the back wheel and the front wouldnt have lifted up when you accelerated hard.

Did yours slip on every gear at the start or just certain ones to begin with?

Mine did it in every gear and before I got the plates replaced it was quite bad. If yours has the same problem it will get worse as the plates wear more. Then it will be more easily detectable.

**AllanB** · 22nd June 2014, 17:47

Sounds like clutch. Keep riding and it will get worse and confirm the clutch is done.

Or the chain - farking GN owners neglect their chains something awful from what I see rattling along.

**skinman** · 22nd June 2014, 18:20

sounds like clutch, plates may still be ok but springs may be weak which the mechanic will not be able to check. Probably be relativily cheap to replace clutch on one of them. surprised it isnt happening in higher gears as well but if it is the clutch it will eventually, maybe not enough power

**Akzle** · 22nd June 2014, 18:55

Originally Posted by jrad

the front wouldnt have lifted up when you accelerated hard.

a gn! Funny guy!

Chain, oil, clutch. In that order.

**jrad** · 22nd June 2014, 19:49

Thanks guys, sounds like i should just keep riding it until the clutch craps out.
Appreciate the comments and advice

**ducatilover** · 22nd June 2014, 20:06

Adjust the clutch first...

**FJRider** · 22nd June 2014, 20:12

Originally Posted by jrad

Thanks guys, sounds like i should just keep riding it until the clutch craps out.
Appreciate the comments and advice

Good idea .. just don't go far from home (civilization) until it does.

The recovery costs may exceed the bike's worth ..

**Big Dog** · 22nd June 2014, 20:16

Simplest check, is your clutch cable properly adjusted?

My wife's old gn had a similar issue. Turned out that very occasionally the cable would not fully return making the bike prone to slips near the redline in top two gears only. Right about where peak torque is? Usually only if clutching the shift.

Fix was to correctly adjust the cable, degrease and grease the cable. For us that meant bending the adjuster at the clutch end into the proper alignment. Bent from a previous lie down. That 5 degrees meant the clutch lever went all the way home.

If that is sell operational. My money is on clutch plates worn or contaminated with car oil.

For the price difference get a kit not just the plates. Go aftermarket if you can. It should: Cost you less for a better quality kit than for genuine plates.

Stupid phone / Tapatalk, apologies in advance.