What Is This Doohickey On the Geico Honda 250 Forks?

mx621
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310
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USA
5/26/2017 11:19am
pretty sure team Honda had these on RYNOs crf 450 back in 2001..
downard254
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4073
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Bremen, OH, USA
5/26/2017 11:23am
It's not a Doohickey, it's a Wiggle bearing for a Wobblestick.
5/26/2017 11:29am
This device only connects to the triple clamp and fork lug externally, it shouldn't affect the way the fork works in any way regardless if it...
This device only connects to the triple clamp and fork lug externally, it shouldn't affect the way the fork works in any way regardless if it fails or not. Wasn't Kenny's failure due to internal parts or parts that connected to the fork caps?
5/26/2017 11:34am
Its a Nitrous reservoir so Top Jimmy can Preload his bike MX VS ATV style over them booters.

The Shop

Mini Elsinore
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Huntington Beach, CA, USA
5/26/2017 11:35am
Heck, I'm just glad to know how "doohickey" is spelled. My Mom used that term with frequency. Laughing
5/26/2017 12:59pm
I'm actually developing my own suspension data acquisition device for personal use that i may try to market. I'm a statistical programmer by trade, so data is my forte. The software i'm developing will allow you to datalog suspension action over time, lay it out on a graph, and analyze. It will sync up via bluetooth to a cellphone so that you can use the phone's GPS to track your laps as well. So you'll be able to replay your laps and watch the suspension action. I'm planning on working in some suspension theory to try to help you tune the suspension, as well.

The problem is that the linear potentiometer's the MotoGP guys use are pretty expensive. They are, however, the most accurate. A string potentiometer is much cheaper but has its drawbacks. First you need to use a strong return spring to ensure that there is no slack in the line. Also the string pot wears out a lot quicker. I've seen guys use ultrasonic sensors, too... so its wireless but probably not good when the sonic reflector gets dirty.
Squirtlege
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Neptune Beach, FL, USA
5/26/2017 1:07pm
GuyB wrote:
Trickling into? That's a bit that's been used for several years now, but you don't often see it at the track.
kkawboy14 wrote:
How come you haven't posted up pictures about it....years ago?
ML512 wrote:
We've posted it in Pit Bits multiple times, I know personally I've posted it at least once a year for the past three seasons.
Yea OP... can't believe you haven't read every single post on this site for the last few years. How can you even call yourself a fan for asking such a ridiculous question and not knowing what that oddball "not often" seen part is?

GEEZUS



5/26/2017 4:12pm Edited Date/Time 5/26/2017 4:19pm
I'm actually developing my own suspension data acquisition device for personal use that i may try to market. I'm a statistical programmer by trade, so data...
I'm actually developing my own suspension data acquisition device for personal use that i may try to market. I'm a statistical programmer by trade, so data is my forte. The software i'm developing will allow you to datalog suspension action over time, lay it out on a graph, and analyze. It will sync up via bluetooth to a cellphone so that you can use the phone's GPS to track your laps as well. So you'll be able to replay your laps and watch the suspension action. I'm planning on working in some suspension theory to try to help you tune the suspension, as well.

The problem is that the linear potentiometer's the MotoGP guys use are pretty expensive. They are, however, the most accurate. A string potentiometer is much cheaper but has its drawbacks. First you need to use a strong return spring to ensure that there is no slack in the line. Also the string pot wears out a lot quicker. I've seen guys use ultrasonic sensors, too... so its wireless but probably not good when the sonic reflector gets dirty.
What about an optical device? I guess mud would be an issue.
KimJongUn
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24
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5/25/2017
Location
Florissant, MO, USA
5/26/2017 4:22pm
Swann wrote:
Does anyone know what this red anodized thingamajig is on the Geico Honda 250 forks? There's a thin braided steel cable running down the length of...
Does anyone know what this red anodized thingamajig is on the Geico Honda 250 forks? There's a thin braided steel cable running down the length of the fork tube, which means it is retractable. Very trick looking. Curious what it does besides look trick.





It's actually used for setting the holeshot device... the mechanic just holds down the button and it spools up like a winch and pulls the fork down so they can set the device. Then once the device is set they just release it and it free spools while they are riding.
jg393
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GB
5/26/2017 4:31pm
Factory Fork ECU
All signs point to the ECU
swatdoc
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Temecula, CA, USA
5/26/2017 5:14pm
Bryan - I sure hope you can come out with that suspension data acquisition device you mentioned, at a price that regular folks can afford. I think it would really help us regular guys to set/adjust our suspension without spending big bucks to have a pro come to the track with us to watch us ride. I can envision a time where we can do like what is possible now with remote tuning our cars. Go out on the track, ride a lap while acquiring data, then download the data and email it to a tuner. He reviews the data and makes suggestions on damping settings. Repeat until optimum settings are reached. If the data is way off, a revalve would be in order.
omalley
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Snohomish, WA, USA
5/26/2017 7:19pm
Built-in cable lock for riding at tracks in questionable areas...
bowser
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Location
AU
5/27/2017 6:05am

Nothing more than a cable actuated position sensor for suspension data analysis.

I would imagine they could get displacement (travel/direction) as well as integrating to get velocity (speed of travel) and again to get acceleration (rate of change of speed) for the forks. Match that with a GPS position sensor to get vehicle speed, position, etc to get some really cool data. I imagine suspension in the near future will combine this (or more advanced) technology with self adjusting suspension whether that be electric or magnetic etc

http://www.te.com/global-en/products/sensors/position-sensors/cable-act…
5/27/2017 7:06am
bowser wrote:
Nothing more than a cable actuated position sensor for suspension data analysis. I would imagine they could get displacement (travel/direction) as well as integrating to get...

Nothing more than a cable actuated position sensor for suspension data analysis.

I would imagine they could get displacement (travel/direction) as well as integrating to get velocity (speed of travel) and again to get acceleration (rate of change of speed) for the forks. Match that with a GPS position sensor to get vehicle speed, position, etc to get some really cool data. I imagine suspension in the near future will combine this (or more advanced) technology with self adjusting suspension whether that be electric or magnetic etc

http://www.te.com/global-en/products/sensors/position-sensors/cable-act…
Electronically controlled suspension is explicitly disallowed in AMA and FIM Motocross competition.

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