hi people my gk73a feels as though the restrictor is active bike will red line in 5th gear but tops out at 120mph/12500rpm i recall a mod to a green wire some where which involved fitting a resistor inline but cant remember exact details ..can anyone help an old bloke with altzymers ( plus my mates zxr400 just pips me NOT GOOD as hes my boss aswell and i will not be beaten

Hi,
You put a 1.5k ohm resistor between the green from the cdi and the frame so that the cdi thinks it is always in second, leave the end from the gear selector loose. If you want to check 100% you can put the bike in second gear and take the resistance from the green from the gear selector to ground as its a long time since i did mine but 99% sure it was 1.5k ohm.
Chris.

thanx for reply vvt,s will give it a go let you know how i get on

arghhhh i hate my bike ...... i looked high and low but alas NO GREEN wire. bought the resistors searched for ages for the wire all so i could keep up going to brands on fri .. i seem to have 2 blocks of wires 4 in 1 and 2 in the other . i tried to check each one for a variable resistance whilst changing gear but drew a blank on that route .....anyone got any other ideas... symptoms are red lines in 5th when i change to 6th i cant get anymore revs than where it was when i changed gear ie 120mph@15000rpm in 5th and drops to 12500rpm in 6th but wont rev out holds speed ok

try following the cable from the switch (located near the front sprocket) up and back to the black box in the rear sub-frame. It must be there somewhere. Good luck!

Yep!
Remove the front spocket cover and there is a gear senor, small round black plastic plug with awhite top just in front of the sprocket. Follow the wires up to somwhere near the battry and ther are two wires one black that is a ground for when its in neutral and a green that usually has a yellow trace line. This goes direct to the cdi box and gives different res for the gears. Defo sounds like your hitting the 180kph restrictor, the motor will not give any more at this point. Can you post a close up pic of the cdi showing both plugs and the wires/colours.
Chris.

was looking again tonight (weds) i can see a black wire with green/yellow bands just before bullet connector i tried to disconnect but bike just dies i plugged in resistor and ran to earth left gearbox end free ie disconnected but still nothing think im in the right area.. cleaned up all connectors a couple were furry found a green wire and a blue but neither seemed to run to gearbox i think one is stand wire other is temp sender wire will try to photo wires i have wiring diagram but all items are in japanese colours are workable but shows 4 wire plug and 3 wire plug mine is 4 and 2 as said i think pics may be the way forward.....thanx for your help guys..