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Purity Vendetta
Scooter Boy
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Joined: 23 Apr 2014
Posts: 72
Location: North Shropshire
PostPosted: Sun Oct 11, 2020 2:19 am    Post subject: Exup valve not cycling. Reply with quote

Hi all, I haven't been on here for quite some time, long story but I'm determined to get my FZR1000RU back on the road next summer. I'm in the process of 'recommissioning' the bike and have noticed that the exup valve no longer cycles through when the ingition is turned on. The valve appears to work otherwise. Anyone have any ideas? I'm thinking perhaps an issue with the CDI unit as it seems to control the valve. Given the tendency for them to seize up I want it to do the whole cycle like it used to.
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Stig
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Joined: 28 Sep 2005
Posts: 11520
Location: digging through projects
PostPosted: Sun Oct 11, 2020 7:27 am    Post subject: Reply with quote

Basics first...
Remove cables from 1 end so you can check individual Checking servo is working

Turn servo pulley wheel full in one direction. Then turn ignition power on and pulley wheel should reset to centre. Try other direction. If both self centre then servo is good.
There are plastic teeth inside the servo that sheer when the valve seizes. Some folk have swapped the gear over 180 degrees and successfully used the other unused area of the gear wheel. Also R1 gears are rumoured to fit

Then check if valve itself is free to rotate by moving pulley wheel by hand
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Purity Vendetta
Scooter Boy
Scooter Boy
Joined: 23 Apr 2014
Posts: 72
Location: North Shropshire
PostPosted: Mon Oct 19, 2020 1:15 am    Post subject: Reply with quote

Hi Stig, yes I went through all the normal checks, valve and cables free. The servo recentres when the ignition is switched on. I've come to the conclusion that it's a fault in the CDI unit as that controls the servo. I might try to borrow one to confirm my suspicions. The weird thing is that the system seems to be working re the revs.
Hope you're keeping okay in these strange times and thanks for the reply.
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Stig
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PostPosted: Mon Oct 19, 2020 7:23 am    Post subject: Reply with quote

If the servo moves on self set and with the revs. What makes you think itís not working?
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itsnotagenesis
More Rabbit Than Sainsbury's
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Joined: 10 Oct 2005
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Location: Paisley
PostPosted: Thu Oct 22, 2020 7:10 pm    Post subject: Reply with quote

You may be looking for a problem that isnt there. Not all servos cycle when switching on the ignition.
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