TZR250 3MA

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Speed limiter working

3MA CDI > CDI (facts)

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.

S=safety (speed limiter)

Ypvs curve:

00%   at 5850RPM
12%   at 6270RPM
24%   at 6810RPM
36%   at 7260RPM
48%   at 7800RPM
60%   at 8190RPM
75%   at 8760RPM
90%   at 9300RPM
100% at 9720RPM

This movie shows the Speed limiter in action.

The pulse generator give a signal round 12.000rpm.
And 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 after 9720RPM

* Speed limter active

When no speed Limiter signal is given to the CDI

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