Tilt switch

[Ariel Badger]

I am experiencing a problem keeping my front wheel down when I launch on the sprint or drag strip. I have the gearing higher than it was and it feels right for the 1/4 mile but I have trouble off the line. I have reverted to sitting right forward on the tank and laid forward over the bars but a few too many revs with a dumped clutch and I am standing on the back wheel and because of my body position it is not easy to control when she comes back down ( I will get hurt or a spectator will get hurt).
I know that the Moto GP riders have devices to kill the motor if they lift, could I just fit a tilt switch into my kill switch circuit or will this set me off like a kangaroo as it cuts in and out?
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Bikers make great organ donors, get 115 on your licence today.

[Howling TerrorOutOfOffice]

Does your bike have an ECU?

I don't need to be an expert to know that a tilt switch wouldn't be sophisticated enough.

Practise more...Buy more friction plates.
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Diabolical homemade music Bandcamp and Soundcloud
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The Harry Turner Project

[Ichy]

[misscrabstick]

Longer swinging arm and more weight over the front is the best I can do, I'd have though any electronic solution will slow you down.

[Ariel Badger]

At work I carry about 40 Gig of memory in my pockets in memory sticks, the Moon Landing Apollo 11 in 1967 had 78K of RAM and ROM combined, my bike has an on off switch (1 byte)
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Bikers make great organ donors, get 115 on your licence today.

[Ariel Badger]

[Ariel Badger]

[bladerunner]

Tilt switch ......not a good idea! Might as well use the kill switch! It wheelies....hit the kill switch...front comes down....hit run.......that's going to cause a massive wheelie! Better technique on the launch required. I always used to slip the clutch like a 2 stroke keep the engine at peak power and feed it in using the clutch...on the bigger bikes 900cc plus....it was dump the clutch with say 1/4 throttle and control the wheelie/ wheel spin with the throttle....std jap sports bikes with wet clutches mind! I don't know what era or spec your machine is but some methanol burning classic springs to mind!
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Current bikes...cbr929, KDX200's, Rd125lc mk2, RGV250's

[Ichy]

[Ariel Badger]

[Howling TerrorOutOfOffice]

Hope Pete. and Kickstart chip-in as they are experienced draggers, I suspect they will say increase wheelbase...so maybe fit the lump into something more suitable?
____________________
Diabolical homemade music Bandcamp and Soundcloud
Singer songwriter, Artist and allround good bloke Listen to Andrew Susan Johnston here
The Harry Turner Project

[bladerunner]

[misscrabstick]

[Old Git Racing]

Watch the speedway riders launching. They get the clutch adjusted so its right at the end of the adjustment without slipping then 'fan' the lever as they are launching to get a bit of slip and control the front wheel.

OGR
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2022 Tiger Sport 660 2019 Street Twin 2003 K3 gixxer 1000 1998 Srad 600 track hack

[Ariel Badger]

[lihp]

The way to do this is to use a variable potentiometer.

https://www.instrumentationtoday.com/wp-content/uploads/2011/07/Linear-Potentiometer-Transducer.jpg

Attached to the forks so that you can measure when they reach full extension. What you then do is run it through a control circuit that reads the resistance and gradually delays the low voltage signal going to the coil so that you end up with a smooth kill. Faster the extension the faster it cuts the ignition.
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covent.gardens: lihp is my most favourite member ever

[misscrabstick]

[Ariel Badger]

It is mag not coil (although I may put an electronic unit into the mag casing at some time) I think I will fit a tilt switch but set it so that it cuts only when the front is stupidly high. I can handle a six inch lift at launch but anything higher that a foot and it will come down out of shape and cost me time anyway
____________________
Bikers make great organ donors, get 115 on your licence today.

[Vincent]

Rev limiter?
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Space Is Deep

[misscrabstick]

I'd like to see a pic of this museum piece your racing please Mr Badger, are there any on here anywhere?

[Ariel Badger]

My pleasure
____________________
Bikers make great organ donors, get 115 on your licence today.

[misscrabstick]

Thank you, I can see that would be very likely to wheelie a lot, it's almost trials bike like in wheelbase and geometry.

[misscrabstick]

Thinking about the wheelie thing, thought about lopping a few teeth off the back sprocket to reduce the acceleration off the line?

[Fisty]

Fit a wheeilie bar?
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TL1000R | Hayabusa | ZXR400 | TL1000S | Bandit 400 V
Fatter and faster than Fret

[Pete.]