Yeh, i knew it was to do with sound. I'll make sure i get the correct name for it on Monday.ZR Stevo said:The thingy valve opens at high revs above 5k i think and its to make the engine quieter until then.
They only test sound emmisions to 5k.
................but i have an orginal 160 back box on my ZR 105 & it went straight on with no mods?.Online Shop Admin said:Between the ZR 1400 AND 1800,(original fitment) the back box is different, back box to centre section gasket is different, centre section is different, centre section to front pipe gasket and front pipe. So basicaly the whole lot is different is what i'm trying to say :eyes:
So the Major is probably right, the bore sizes are different.