Evilchicken0 wrote:If the exup valve is stuck then that's your problem. If it's shut the bike wont fuel above 8000rpm. If it's open then the exhaust is to big for the engine at low revs - below 8000 and it will be a bit gutless.

I'd do the valves too - look in the document library (the links at the top of the page) and it should be in the setup library (use the 3TJ SP doc) alternatively there's usually a cd around on ebay, it's a rough scan of the workshop manual.