FZR Genesis Exup restricted to 80 Kph

[wiggarella]

Hey Guys n Gals, I have a 400 Genesis Exup. I ve owned it for about 3 months, when i got it, the guy said it hadn t been on the road for a few months, so my mate Grub ( custom bike builder down kent way, Blackmarket Customs-see back street heroes dec and march editions) an I set about it. all the usual, plugs, leads, cleaned the carbs on a few occassions, checked floats and needles, the fuel is all flowing as it should, the exup valve was broken so fixed that. but it has this green light on the dash that comes on at 80 kph and totally fucks with the running of the babybeast.... I was told, that in japan, their speedlimit is 80kph,and all their motors are restricted to this, and that the restricter is in the back of the speedo, but if i change the speedo I will bugga the CDI unit....Some one else told me to disconnect the speedo cable from the back of the speedo and take it for a spin, see if it goes over 80kph without any probs, then I know. so I m gonna try this at the weekend and take it from there. from what i can work out from this site, the next thing to do is join the orange and brown wires in the back of the speedo, and then get one of these gold mechanical de restricters to put at the other end of the speedo cable....or am i going for overkill here?! Look forward to hearing suggestions on what the problem may be and what I can do about it.
tanx guys

[Evilchicken0]

The easiest way to stop the restriction is to fit the gold KMH to MPH converter - don't join any wires cause if you get it wrong the bike will restrict to 12,500 revs in all gears.

Let me know what revs your doing at 80 kmh - it sounds like the main jet in the carbs are blocked or dirty.

[wiggarella]

evilchicken also wrote to me :
'Could you have got the main jets swapped for the idle jets ??? did it once with one carb and everything was fluffy over 6-8k revs.
They are the two brass cylinders in the carbs ... you see them when you take off the float bowls. You unscrew them with a flat screw driver.
You have 2 sets of jets - idle jets which take care of the slow running up to 6-8k then the engine needs the main jets to run any higher. If the main jets in one or two carbs then the bike will run sweet as anything until it needs more fuel above the 8k rpm, at that point the blocked carbs will cut the power to the affected cyclinder - it's like a restriction cutting in because the cylinders are dead. Then when you drop lower than those revs the engine picks up again because the idle jets supply fuel.

Put this in the Workshop forum and some of the others might have pictures to help you'

do any of you have pictures to help me ? would be much appriciated...