Welcome brother.
From personal experience, the bike needs a working/correctly setup Exup system, sounds like you've bought a potential shitter that's been abused/bodged, don't assume you're just only missing the Exup valve assembly, there's a servo motor just forward of the left side coil under the tank that runs a pull/push twin cable setup that operates the Exup valve, i'd check all parts are present before spending money.
Early Yamaha R1's use the exact same Exup valve, as does the Thunderace, i think the servo's are the same too, dunno about cables, headers are defo different, not massively but they're are different, you might get away using R1 headers, but you'll have to do some welding as the lower mount near centre stand is different from memory, Thunderace headers will likely be no use as these run the older FZR motor, 99% sure the Exup valves are all the same on all 3 bikes tho, at least you've half a chance on Ebay finding a usable valve assembly, even though the headers won't be much use unless you're handy with an arc welder.
My advice is don't spend on this bike until you've confirmed the motor's not shagged in any way, leave tuning the carbs until you sort the missing Exup system.
I've often seen usable FZS1000 headers on eBay with the valve missing, seen as new minter headers with the Exup still fitted on USA eBay listings, shipping is a biatch tho, don't forget other bikes in Yamaha's range use the same parts.
Good luck bro ?
Just seen these headers (Poland) so not far from you... look in decent nick, just missing the valve assembly.
https://www.ebay.co.uk/itm/177334974829?
From personal experience, the bike needs a working/correctly setup Exup system, sounds like you've bought a potential shitter that's been abused/bodged, don't assume you're just only missing the Exup valve assembly, there's a servo motor just forward of the left side coil under the tank that runs a pull/push twin cable setup that operates the Exup valve, i'd check all parts are present before spending money.
Early Yamaha R1's use the exact same Exup valve, as does the Thunderace, i think the servo's are the same too, dunno about cables, headers are defo different, not massively but they're are different, you might get away using R1 headers, but you'll have to do some welding as the lower mount near centre stand is different from memory, Thunderace headers will likely be no use as these run the older FZR motor, 99% sure the Exup valves are all the same on all 3 bikes tho, at least you've half a chance on Ebay finding a usable valve assembly, even though the headers won't be much use unless you're handy with an arc welder.
My advice is don't spend on this bike until you've confirmed the motor's not shagged in any way, leave tuning the carbs until you sort the missing Exup system.
I've often seen usable FZS1000 headers on eBay with the valve missing, seen as new minter headers with the Exup still fitted on USA eBay listings, shipping is a biatch tho, don't forget other bikes in Yamaha's range use the same parts.
Good luck bro ?
Just seen these headers (Poland) so not far from you... look in decent nick, just missing the valve assembly.
https://www.ebay.co.uk/itm/177334974829?