1 KT power valve problems

Technical questions and answers

1 KT power valve problems

Postby reallymeanguy » Sat Apr 22, 2017 11:33 am

I have just bought a 1986 TZR 250 1KT, its a jap import with seemingly very low mileage of only 10,000 kms.
I replaced the battery put some fuel in it and it started 1st kick and appears to run niceley and is free from noises.

On turning the key there is no noise from the power valve motor despite it turning freely after i removed the cables, also the power valve moves freely in the barrels, so I believe it must be an electrical issue.

Does anyone have any hints or tips as to what the issue could be caused by, and or what other components affect the power valve servo operation?

Can anyone help with a wiring diagram and an explanation of which wires should have power etc?

thanks in advance any help gratefully accepted.

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Re: 1 KT power valve problems

Postby teezer250 » Mon Apr 24, 2017 11:34 am

Here's a link to the 1KT wiring diagram:
http://pure2strokespirit.net/forums/ind ... pic=4198.0
Refer to the 1KT diagram posted by nronketti

To check servomotor operation,connect battery leads, +(pos) lead to black/blue and -(neg) lead to black/red lead which should power the servomotor in one direction.
Do this test for only a couple of seconds to prevent further damage.
If the servomotor does not operate during this test,then it is faulty.
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Re: 1 KT power valve problems

Postby ypm76 » Tue May 02, 2017 4:39 pm

It's common for the PV controller to get fried. If so you can send them for repair to 2 Stroke Race Lab

Check the lead that links the PV controller to the CDi.
Check that the earth is good from the loom to the frame. We run an extra earth from the clutch cover to the frame.

Check all that first before fitting another PV controller or you will fry that one as well!
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