EXUP Cables

[stuartadair]

Hello all

I'm thinking about buying an FZR1000 but the seller says that the EXUP cables have been removed. He says it doesnt affect the bike running...

a) What are EXUP cables ?
b) Am I worried if they are missing ?

Thanks
Stu

[Kickstart]

Hi

EXUP is the exhaust valve. It is a valve in the bottom of the exhaust that rotates to open and close, with a servo motor under the seat to operate it. Couple of cables go from the servo to the valve.

Chances are it the cables have been removed then the valve has seized. It is there to allow an exhaust design and cam profile set up for high revs power, which normally knackers up bottom end / midrange. The valve opens at high revs to allow things to work properly, while at low revs it is closed to screw up the pressure waves that otherwise knacker up the lower rpm power.

If the valve isn't working then it will either be open or closed. If open it will be missing a load of bottom end power. If closed it will be missing a load of top end power.

All the best

Keith
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[69chris]

if its the fzr im thinking of id be more worried about the hideous handlebars/ risers than the missing exup cables

[stuartadair]

Many thanks. I can get both servo and cables for <£50 on ebay so I'll take that into account when I'm haggling

Risers would have to go

[jimbothe]

Alternatively you could also have the carbs rejetted and put free-flowing exhaust headers on there.

This would eliminate the seizure problems that exups are reknowned for.
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[MarJay]

[Kickstart]