EXUP Valve Opening and Closing Check

All R1 1998-1999 4XV questions and discussions specific to this model should be posted here.
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PaulS
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Posts: 9
Joined: Tue May 06, 2025 8:24 pm
Bike Make & Model: YZF-R1 4XV

EXUP Valve Opening and Closing Check

Post by PaulS »

Hi,

There are no fault codes on my 98 R1 . I’ve watched the EXUP opening and closing to check its operation . If I slowly open the throttle and incre…login to view the rest of this post


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