TZR250 3MA
New
Title
Go to content
Speed limiter.

Turns out that the ''Speed limiter'' working/firmware was surprisingly different than we thought.
First thought's where that when the metal tap comes between the optics, a safety curve (or speed limiter curve) was selected so the engine drop the power off.
This turns out not to be through.
New findings shows us that its not the ignition curve that is changing, but the ypvs servo motor does turn the pv's a touch back to drop the power.
Have made a test setup, to readout the ypvs curve.
With the pulse generator, I could generate relative good measuring points.
With steps off about 500rpm.
C=Close
O=Open
S=safety (speed limiter)
This movie shows the Speed limiter in action.
The pulse generator give a signal round 12.000rpm.

Me giving the speed limiter signal with a metal tap (below in speedlimiter circuit board)
You see clearly that the ypvs motor is closing the pv's a touch
(estimated 30%)
This movie shows the speed limiter in action.

Me making with the pulse generator steps off about 500rpm.
You see when the PV is fully open (at 9720RPM) and RPM is rising after 10.500rpm the ypvs motor Closes the pv's a touch
When is the Speed limiter active or not?

* Speed limiter not active
The CDI needs to see the metal tap ones (speed limiter signal)
This is checked it two ways
1) Metal tap is seen when bike's ignition is set on.
2) Metal tap is seen before ypvs starts working < 5000RPM

After the CDI has seen the speed limiter signal ones, the free ypvs curve is given and wont close.

* Speed limter active
When no speed Limiter signal is given to the CDI
1) No metal tap is seen
Back to content