power valve? HELP PLEASE FZR400r 3EN2

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fzrowner1
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Re: power valve? HELP PLEASE FZR400r 3EN2

Post by fzrowner1 »

that is it the other black box is a little alarm i put on her as no steering lock cheers
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S.J.Hunter

Yamaha FZR400R 3EN2 1989
fzrowner1
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Re: power valve? HELP PLEASE FZR400r 3EN2

Post by fzrowner1 »

The servo works!!! Thankyou SO much amazing help can't thakyou enough cheers sean
S.J.Hunter

Yamaha FZR400R 3EN2 1989
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GreyImport
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Re: power valve? HELP PLEASE FZR400r 3EN2

Post by GreyImport »

Good stuff!

:thumbsup:
1990 FZR250R 3LN1
1977 Triumph Bonneville 750 T140V
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Stig
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Re: power valve? HELP PLEASE FZR400r 3EN2

Post by Stig »

If the servo is plugged in, to check it....with the ignition OFF rotate the pulley wheel either way until it stops. Then turn on the ignition and the pulley should self centre. if it doesnt and you can hear it trying then theres a good chance that the plastic cogc inside may have been stripped. This usually happens when the valve in the exhaust seizes and the cables try to be moved by the servo...this in turn strips the gears. Its possible to get replacement gears from inside servos from other models but only certain of which ones in the case of the 1000.
On some models even if the servo isnt used due to the exhaust being swapped for a race pipe for instance, you have to leave the servo connected into the loom to stop the bike going into limp home mode. This causes the revs to be limited to around 4K
If you still have the std headers and the valve and its free to rotate, it might be just a case of replacing the cables. Thers an article over on my site to show how to make your own at a fraction of the cost of OEM

http://www.exup1000.co.uk/tech_info_are ... cables.htm

Hope this helps
If its not broken it dont need fixing

http://www.exup1000.co.uk
fzrowner1
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Re: power valve? HELP PLEASE FZR400r 3EN2

Post by fzrowner1 »

theres dont seem to be anywhere where the cables go? when fairing on cables cant go anywhere? and ideas cheers
S.J.Hunter

Yamaha FZR400R 3EN2 1989
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Re: power valve? HELP PLEASE FZR400r 3EN2

Post by Stig »

if they're same as the 1000, they run down the back of the engine gearbox casting then between that and the swingarm pivot to join to the pulley on the cast mainfold
If its not broken it dont need fixing

http://www.exup1000.co.uk
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