What’s up EXUP?

Practical Sportsbikes (UK) - - On The Bench -

My Yamaha FZR1000 loses power when it gets hot. If I stop the bike and let it cool down for a bit, it’s fine. But when I set off the prob­lem soon re­turns. What do you reckon? Nige Ryan, email Gary Hurd says: Sounds to me like the EXUP valve is stick­ing when the bike gets hot. This isn’t un­com­mon. Time for an over­haul of the valve and make it a part of your reg­u­lar main­te­nance sched­ule. EXUP valves are usu­ally OK if ser­viced reg­u­larly, and not if not

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