2013 RTL stumbles in the corners - any ideas to fix?

[msherwood]

I have a 2013 RTL with 4,000miles I have noticed lately when throttling up coming around corners the bike wants to briefly stumble but recovers. The tank of gas is full. Any ideas that may cause this?
thanks

[youngers]

when in the curve , do you down shift ? ( just a thought )

[msherwood]

when in the curve , do you down shift ? ( just a thought )

I downshift prior to the turn

[Peter Aawen]

Try being a little slower & smoother on the throttle input, or maybe just get more of your weight over to the inside of the corner first, or possibly even just lean down & forward into the corner more & only PULL on the inside handle bar (no pushing on the outside bar at all!) If any/all of that makes a difference, then there's a good chance that the 'stumbling' will have been your Nanny!

The 'Nanny' is really quite sensitive, & reads the input from all the various sensors to determine how the Spyder will react in the corner given things like your wheel rotational speeds, the handlebar steering angle, the throttle position or even its rate of change (fast throttle opening can cause power cuts much earlier than slow & gentle openings, even if you start them earlier so that the throttle is already open far more by thdd time you get to where it stumbles with a fast opening!) And that PULL not Push thing on the outside bar is because pushing forwards on the outside bar means that unless you are extremely short, you will also be pushing DOWN & out to some extent; & that occuring on the outside end of the outside bar will be exerting far more leverage & significantly increasing the outward throw of centrifugal force that is detected by the yaw sensor & thereby making the Nanny react to the greater tendency lean out/potentially roll that its sensing early in the corner. By leaning forwards & down into the corner & pulling on the inside bar, the 'throw out leverage' is significantly lessened & any leverage you exert on the handlebars will be closer to in & hold down the inside of the corner rather than the down & roll out that you exert by pushing; all of which adds up to lessening the sensor input prompting the Nanny to decide that you are going to be flipped off to the outside or that you aren't getting enough of your weight down & in enough to the inside of the corner to stop that inside wheel from lifting &/or are thereby risking the Spyder flipping.

The Nanny really is very good at what it does, and it can do a whole range of things that can give you that stumbling feeling - like pulse, apply, or adjust the braking effort to any one or more of the wheels as well as doing the normal ABS & EBD stuff; it can interrupt the spark power to one or more cylinders; reduce or change the timing, quantity, & even the duration of the fuel injection pulse; it can vary the level & degree of power steering assist depending on how much & how fast you feed in the control input; it can vary the throttle input in much the same way; & it can basically combine any or all of these in any combination that the sensor input suggests might be necessary for you to remain safe & in control in response to all the feedback & input that it's getting. The trick is becoming aware of what you are doing with your physical & control input at the instant this occurs, so that you can 'fine tune' the way you move & feed in control inputs in order to back off on what ever is triggering the 'stumbles', and learn to drive/ryde juuuust under that level in order to get the smoothest & fastest ryde you can from your Spyder.... or you can back off & slow down so you don't upset her quite so much!

Then there's all the ways that 'fine tuning' your suspension & varying your tire pressures can change the way the sensors react & make the Nanny respond.... but let's not go there yet! Over to you!

[BajaRon]

It's the Nanny. She doesn't like your style. As suggested. Try to be smoother at everything. That will help to keep the Nanny off your back.

[2dogs]

If you keep hitting the nanny maybe that's why your wife won't ride with you.

[msherwood]

Try being a little slower & smoother on the throttle input, or maybe just get more of your weight over to the inside of the corner first, or possibly even just lean down & forward into the corner more & only PULL on the inside handle bar (no pushing on the outside bar at all!) If any/all of that makes a difference, then there's a good chance that the 'stumbling' will have been your Nanny!

The 'Nanny' is really quite sensitive, & reads the input from all the various sensors to determine how the Spyder will react in the corner given things like your wheel rotational speeds, the handlebar steering angle, the throttle position or even its rate of change (fast throttle opening can cause power cuts much earlier than slow & gentle openings, even if you start them earlier so that the throttle is already open far more by thdd time you get to where it stumbles with a fast opening!) And that PULL not Push thing on the outside bar is because pushing forwards on the outside bar means that unless you are extremely short, you will also be pushing DOWN & out to some extent; & that occuring on the outside end of the outside bar will be exerting far more leverage & significantly increasing the outward throw of centrifugal force that is detected by the yaw sensor & thereby making the Nanny react to the greater tendency lean out/potentially roll that its sensing early in the corner. By leaning forwards & down into the corner & pulling on the inside bar, the 'throw out leverage' is significantly lessened & any leverage you exert on the handlebars will be closer to in & hold down the inside of the corner rather than the down & roll out that you exert by pushing; all of which adds up to lessening the sensor input prompting the Nanny to decide that you are going to be flipped off to the outside or that you aren't getting enough of your weight down & in enough to the inside of the corner to stop that inside wheel from lifting &/or are thereby risking the Spyder flipping.

The Nanny really is very good at what it does, and it can do a whole range of things that can give you that stumbling feeling - like pulse, apply, or adjust the braking effort to any one or more of the wheels as well as doing the normal ABS & EBD stuff; it can interrupt the spark power to one or more cylinders; reduce or change the timing, quantity, & even the duration of the fuel injection pulse; it can vary the level & degree of power steering assist depending on how much & how fast you feed in the control input; it can vary the throttle input in much the same way; & it can basically combine any or all of these in any combination that the sensor input suggests might be necessary for you to remain safe & in control in response to all the feedback & input that it's getting. The trick is becoming aware of what you are doing with your physical & control input at the instant this occurs, so that you can 'fine tune' the way you move & feed in control inputs in order to back off on what ever is triggering the 'stumbles', and learn to drive/ryde juuuust under that level in order to get the smoothest & fastest ryde you can from your Spyder.... or you can back off & slow down so you don't upset her quite so much!

Then there's all the ways that 'fine tuning' your suspension & varying your tire pressures can change the way the sensors react & make the Nanny respond.... but let's not go there yet! Over to you!

Thanks for the valuable input, I'll try going easy on her to see if it improves

[Chupaca]

It's the nanny and she especially does not like throttling out of a turn going uphill where it is most comon to be more aggressive....

[sylvester]

try 1/3 of a can of seafoam with a full tank

[ARtraveler]

Driving style might have something to do with it. The Seafoam idea is not bad either.

I answered your post about getting the wife to ride with you.

[BajaRon]

Thanks for the valuable input, I'll try going easy on her to see if it improves

Though going slower will probably help with the Nanny. It isn't necessarily the solution. Going SMOOTHER can eliminate interference from the Nanny while at the same time getting you through the curve faster and safer, in many cases.

Slowing into the turn and staying wide as you enter, hitting the apex correctly and smoothly throttling out of the curve as you smoothly drift to the outside can give you more speed while improving the entire experience at the same time.

[canamjhb]

Somewhere I read, heard, or was told to push on the outside bar when turning. Thank you Peter for correcting that miss-information. Yesterday I went on a 200 mile group ride that included a lot of twisties as well as higher speed sweepers. Applying the proper steering technique made for a much more comfortable, steady and confident ride. And, nanny didn't interfere with the fun..... It's nice and sunny out right now. Think I'll go for a little spin. Bye, Bye for now.