GK76A Speed Limiter

[Jaicen]

+1 for me Please.

[Variablevalves suck]

It's very easy to do.
From the gear sensor near the front sprocket runs two wires, one is the neutral the other (green/yellow) is the actual sensor wire.
Under the seat these plug using bullet connectors into the loom that takes them straight to the cdi.
Disconnect the green/yellow and leave the gear sensor end loose, take the other cdi end and ground this using a resistor.
If you measure between the gear sensor terminal and ground using a ohm meter you will get a different reading for every gear, any of the lower gear readings could be used as a figure to base the resistor on but 1K ohm or 1.5K ohm is known to work.
I simply take a short piece of wire crimp a bullet connector on one end to fit the loom, put a washer type with 6mm hole on the other to fasten to the frame and then cut the wire in half.
Taking two female bullets turn them face to face, put the resistor inside these and then crimp this between the cut wire so using the female bullets as a case/cover for the resistor.

[ben2306]

thanks, VVS! understood. i like to know, after doing this, what's the difference actually? we can rev all gears past red line? or still the same, can't pass red line, only that we can hit a higher top speed?

[Variablevalves suck]

So far as i know this removes the 180 kh limit.
Different resistors ran on the dyno may show otherwise but i'd be suprised as i dont think the cdi's are that clever.
Would have thought a simple advance curve.
Even if the resistor allows the bike to over rev i'd take it easy as the motor will go pop.
The last time i ran my bike on the dyno it made power to 14200 rpm and then dropped off very quickly, if you over rev the bike there's no power, your quicker changing at 14000 rpm.

[ben2306]

I've took some pics as I'm not sure which is the wire. Hope somebody can identify for me which is the gear sensor wire. Will post tonight.

[ben2306]

VVS, guys, do me a favour. help me to identity which is the gear sensor wire. thanks alot.

pic 01

pic 02

[Variablevalves suck]

You are not showing it.
In picture 1 & 2 its one of the three wires.
Follow these up to the seat area and one will end with two bullet connectors, a blue thats neutral and the sensor wire thats green/yellow.
They are not multi connectors only bullets.

[ben2306]

the above pics will be deleted as its not useful!.
ok, tomorrow, i'll pull down the rear & look for it again!
with photos, haha. because my wiring loom is a mess, i tell you. i found a green wire with male bullet leads to nowhere. can i say that green wire should be a ground wire? i know nothing about electric...

[rvf400]

VVS, guys, do me a favour. help me to identity which is the gear sensor wire. thanks alot.

pic 01

pic 02

Actually it is showing it.
the Wires that appear to go to the front sprocket are actually going to the gear position sensor unit.
Its fixed to the engine by 3 screws.
Remove the device from the bike. follow the wires until you reach the bullet connectors and remove it.
With it on a table where you have good lighting inspect the unit.
One side has the copper looking circles that are actually the gear position contacts.
The other side has a silicone putty in it.
The putty is what you need to pickle away.
Once you have rid of the stuff ( take your time to clean it off gently with a terminal driver) Your in position to ID the correct resistors.
Easy rule of thumb is the 1k or 1.5k resistors depending on the year of the bike are what you want to keep, the others are probably 100k to 150k.
Test these with the excellent diagrams at the start of this page using the ground wire with one end of your meter and the other on the back of the unit on the copper pick up points.
With a bit of wire solder links from the 4th thru to 6th back to either both 1k/1.5k resistors.
Cut out the 100k or greater resistors with a scalpel or sharp pliers.
Test that you have 1k / 1.5k on all gears from the ground wire to the gear terminals.


Now as for power it will not give you more BHP but what you will find is that in the top 3 gears the bike will pull hard to the Red line and go to 130mph plus with no dramas.

[Variablevalves suck]

The picture shows a group of wire covers, not the green/yellow wire.
Yes, if the correct one is followed down it would come to the gear sensor, BUT as i said if you go under the seat you will find the other end with the green/yellow wire.
You DO NOT need to butcher the gear sensor you simply disconnect under the seat and connect the resistor between the cdi side and earth leaving the gear side loose.
Simple and no 180kp restriction.