r6 oversteering

[stranger12]

Hi All,

My r6 seems to want to oversteer quite a bit when turning . I have few times felt that it is very close to drop me .



No I am not going fast and doing a very safe and reasonable speed however the bike feels as if it is going to slide .

So reasons i have in mind

I am getting a lot of feedback from the front tyre so trying to work out whether it is the rain or my new tyre .

I have changed the front tyre to angle gt as per my earlier post and the rotation of it is incorrect and will need to rotate the tyre. I am planning to do this , this weeked.
Can rotation cause this ?

Someone might have played with the sag setting when parked at work , very unlikely .


tyre pressure, my rear is 38 and front is 34, does it sound right ?

Can it be anything to do with head bearing or anything among those lines ?

today so far , 3 times it felt as it is goung to oversteer and i controlled it .

many thanks
____________________
SV650 Red
R6 Red

[........................]

Oversteer? You mean lean to far or that the rear wants to overtake the front?

[stranger12]

sort of but the front initiates it . the front is turning to the corner too much as soon as I try to lean a bit .

I am not leaning far and today was going around round about at 5 degree lean (almost straight) and very slow.


You can see from my rear 185 tyre, only 20 mm from the middle has been used, big chicken stripe.

as an example, approached the round about , trying to turn right and as soon as I increased the turn angle it felt as if the the bike front wants to turn all the way to the right hence the back popping out and having a high side.
____________________
SV650 Red
R6 Red

[........................]

Is it a old tyre? Sounds like it's squared off and as you tip over onto the edge of the squared off bit, it feels like it's falling inwards.

[Howling TerrorOutOfOffice]

^^^Feeling from a squared off tyre feels quite different to the oversteering effect of a bike with it's arse up.

After doing all the usual checks like head bearings, front and rear wheel bearings then check on the ride height.
Has the front end been lowered or the height increased on the rear? If so then return to original spec and see how it handles.
____________________
Diabolical homemade music Bandcamp and Soundcloud
Singer songwriter, Artist and allround good bloke Listen to Andrew Susan Johnston here
The Harry Turner Project

[stranger12]

i have change it and it is a brand new tyre but installed wrong way ( i will sort it this week).

I can occasionally hear a bang or click from fork which is very hard to describe but it is not that often, can it be that ?

Exactly it seems as the front is trying to turn too much .
____________________
SV650 Red
R6 Red

[MarJay]

Avoid using technical terms to describe the problem, because oversteer means you're losing traction on the rear tyre. What you describe is the front end 'tucking under' which happens on those R6's. However, installing a tyre backwards won't help, especially in the wet.
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Fizzer Thou]

Have you fitted a 120/60x17 or a 120/70x17?
What tyre pressures are you running?
Have you checked the pressure since the new tyre was installed?
Have you got an accurate pressure gauge? (do not rely on the dial gauge on a foot pump as they are notoriously inaccurate )

Have you thought about getting the front end checked out?
New fork oil?
Checked the headrace bearings?
____________________
Just talk bikes.What else is there?

Always have a 'Plan B'

[stranger12]

It is 120 60 17
Tyre pressure is 34 front and 38 back

My pressure gauge is a good quality one (aa £15) which i have used for years and it is pretty accurate

When you say it is common on r6 , why would you say that?

I lifted the front end by pulling it toward me when on stand and there is a free movement side to side( checking head bearing) . If i turn it one side it will go all the way without stopping and quite smoothly

What i need to do is check its play horizontally and laterally

Mine is 2005 model with 12k , could it be the oil ?
____________________
SV650 Red
R6 Red

[trisers]

Ermmm...are we missing the elephant in the room?

All bikes have the front forks raked forwards for stability...means if the bike leans the forks will automatically turn into the lean to try and bring the bike upright again.

It was the first thing i noticed when i got on a big bike, only seems apparent at a very slow speed, and a bit unnerving at first. If you actually let go of the bars (not recommending that!) then it appears to 'over steer' and the bike comes upright and then continues in a straight line...

[stranger12]

But the bike feels like as it is going to turn more and slide to the turn .
I have has this bike from march but only noticed this issue2 weeks ago. I used to turn as i wished but now feels really strange
____________________
SV650 Red
R6 Red

[talkToTheHat]

IIRC the r6 geometry is much more aggressive than the sv. Are you applying rear brake or chopping the throttle mid corner?

Even on a raked out cruiser, if I dab the back brake use engine braking with a bit of lean on, the bike tips in to a corner aggressively. On a bike with more aggressive geometry losing a little speed by initiating a turn might be enough to cause this. Apply throttle from the moment you tip in to maintain speed and thrust from the engine.

Whats your grip and body position like? If you're accidentally weighting the bars in the process of 'leaning' then all kinds of chaos can happen. A bike is steered not by the rotation of the bars (like a car) but the torque you apply. There's a great pdf book that is popular on here, I cant remember the name, link please? Grip the tank with your knees, use your core muscles to hold your upper body in place with as little weight as you can on the bars. Push the right bar away from you and the bike will begin to turn right, if you are mantaining speed properly the bike should hold the turn when you stop pushing. If moving around on the bike (i.e. hanging off) causes the bike to further tip in, you may be unintentionally supplying a steering torque as you shift position.

Keith Code's twist of the wrist book/DVD combination will help with your body position immensely if this is the case

Different shaped rear tyres can massively change steering behavior, some are shaped like the pointy end of an egg and turn very positively and agressively. Some are more like the round end of an egg and give a very smooth turn in. A badly squared tyre will take a big shove of countersteer to tip in, then feel like the bike falls away.
____________________
Bandit. does. everything.

[trevor saxe-coburg-gotha]

[stranger12]

thanks for the posts .

I am not very familiar with term of squared tyre, does it literally mean it is squared in the middle of the tyre ?

Looking around people say with squared tyre, turning is slower and suddenly very jerky and quickly . is that because as you transition from the square edge to the round edge the bike falls into the corner ?

re tyre, I have bought the pirelli angle gt however the rotation of the tyre is misleading . I have fitted it as anyone would going by the V shape and bottom of the V been at the front as it rotates however apparently that is not the correct way so I have to rotate it .


my old tyre was avon . i will try 36 in front and see how that goes.

when it feels as if the bike is going to tuck under, will it really do it or is it just the feeling?
____________________
SV650 Red
R6 Red

[arry]

[iooi]

[monkeybiker]

Squared tyre is how you describe. It is when people ride upright a lot like motorway riding. You wear the bottom of the tyre so when you try to lean the bike it get's to a point and rather than a steady roll it flips over at the point so does not feel smooth.

[stranger12]

changing the pressure to 36 seems to have done the trick as I was riding to work .

Did know pressure is important but didn't think 2 psi can do this and change it 180 degree.
____________________
SV650 Red
R6 Red

[trevor saxe-coburg-gotha]

Yeah it's weird - seems like on some bikes with some tyres a few PSI either way makes no difference at all, then on others with others, it can be felt almost straight away. I didn't appreciate this until fairly recently myself. Anyway, hopefully pressure is what it is - don't be afraid to try 4psi above book as well.
____________________
"Life is a sexually transmitted disease and the mortality rate is one hundred percent."

Mobylette Type 50 ---> Raleigh Grifter ---> Neval Minsk 125

[-]

[stranger12]

I think after the ride this morning and also now back home, the situation has improved considerably however the issue is still there.

would inflating it more be ok ?

@mpd72,re tyre direction, I normally take it to a local shop which charges £8 to do it . It is a car tyre shop. what is the yellow dot about exactly ?
____________________
SV650 Red
R6 Red

[talkToTheHat]

https://lmgtfy.com/?q=what+does+the+yellow+dot+on+a+motorcycle+tyre+mean
____________________
Bandit. does. everything.

[stranger12]

____________________
SV650 Red
R6 Red

[andyscooter]

[stranger12]

this saturday
____________________
SV650 Red
R6 Red