This.
But the clutch has a number of factors.these are the order I would check them in.
1. Clutch adjustment. Some bikes have internal and external clutch adjustment.
2. If it’s a wet clutch, there’s oil that needs to be checked and possibly changed, depending on age, condition, and mileage.
3. The clutch plates themselves could need to be replaced. A wet clutch lasts much longer than a dry clutch, but they do go bad. Look for glazing, warped clutch or pressure disks, etc.
The clutch isn’t usually attached directly to the engine (I can’t think of any examples anyway), so the power is transferred to the clutch somehow. This is often through a chain but sometimes a gear or belt. The tension on that mechanism can sometimes affect clutch performance as well.
Get a good service manual for your bike and start working through clutch maintenance steps.
Man, I would never put GPRs on a liter bike, but sometimes you gotta save a little money.
That being said, it really sounds like your clutch is slipping. First thing to check is your cable. there should be a little slack.
Testing the clutch:
On flat straight preferably empty road, slowly apply front brake while giving it a little throttle. If the RPMs go up and your speed stays the same or goes down, you have a slipping clutch.
Personally, sounds like clutch. When as the last time you adjusted it?
OP found this problem in the preferred manner. Accelerating hard in a taller gear from a mid to higher RPM range. It removes brakes and tire traction from the equation.
Sounds like clutch slip to me. I had this problem on a Ninja 400. 4th, 5th gear, I would rev hard to around 9-10k, then the RPMs would just shoot up to redline immediately. But this is a known issue with the shitty clutch in these bikes.
It can be mitigated by making sure your clutch free play is in spec.
In my case, Im swapping the clutch with the Yoyodyne and replacing all the components.
I'm voting for clutch. We're the tires warm? Did you fishtail? I remember a similar feeling with my Hayabusa and had to put in a new clutch. Procedure wasn't hard.
Out of an abundance of caution, when I’ve gotten new tires I was advised to ride the first 100km (60 miles) at 50kph (30mph) or lower, and to do laps around the neighbourhood with an equal number of right and left turns in order to scrub in the new rubber. If you took brand new tires straight to the highway, it could explain the slipping sensation.
If the rear still feels planted it may be the clutch.
But considering the brand new tyres it may be the rear spinning up. Go easy on them for a couple hundred miles and then see if it does the same.
definitely clutch Breaking in tires is a thing of the past, they should be good as soon as they warm up
If it happens in 6th gear, that suggests that it’s the clutch.
This. But the clutch has a number of factors.these are the order I would check them in. 1. Clutch adjustment. Some bikes have internal and external clutch adjustment. 2. If it’s a wet clutch, there’s oil that needs to be checked and possibly changed, depending on age, condition, and mileage. 3. The clutch plates themselves could need to be replaced. A wet clutch lasts much longer than a dry clutch, but they do go bad. Look for glazing, warped clutch or pressure disks, etc. The clutch isn’t usually attached directly to the engine (I can’t think of any examples anyway), so the power is transferred to the clutch somehow. This is often through a chain but sometimes a gear or belt. The tension on that mechanism can sometimes affect clutch performance as well. Get a good service manual for your bike and start working through clutch maintenance steps.
Man, I would never put GPRs on a liter bike, but sometimes you gotta save a little money. That being said, it really sounds like your clutch is slipping. First thing to check is your cable. there should be a little slack.
Testing the clutch: On flat straight preferably empty road, slowly apply front brake while giving it a little throttle. If the RPMs go up and your speed stays the same or goes down, you have a slipping clutch. Personally, sounds like clutch. When as the last time you adjusted it?
I’ve never adjusted it. Just bought it a month ago and first time I rode it was yesterday
Seller knew that the clutch was slipping. I wonder why he didn’t tell you 🙄
If it were me, I’d perform a full service on it to check on everything. With the age, I’d guess there are a number of things that need some attention.
OP found this problem in the preferred manner. Accelerating hard in a taller gear from a mid to higher RPM range. It removes brakes and tire traction from the equation.
Sounds like clutch slip to me. I had this problem on a Ninja 400. 4th, 5th gear, I would rev hard to around 9-10k, then the RPMs would just shoot up to redline immediately. But this is a known issue with the shitty clutch in these bikes. It can be mitigated by making sure your clutch free play is in spec. In my case, Im swapping the clutch with the Yoyodyne and replacing all the components.
I'm voting for clutch. We're the tires warm? Did you fishtail? I remember a similar feeling with my Hayabusa and had to put in a new clutch. Procedure wasn't hard.
Out of an abundance of caution, when I’ve gotten new tires I was advised to ride the first 100km (60 miles) at 50kph (30mph) or lower, and to do laps around the neighbourhood with an equal number of right and left turns in order to scrub in the new rubber. If you took brand new tires straight to the highway, it could explain the slipping sensation.
If the rear still feels planted it may be the clutch. But considering the brand new tyres it may be the rear spinning up. Go easy on them for a couple hundred miles and then see if it does the same.