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Old 08-06-2011, 04:37 PM
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Default OX66 TPS voltage range

I am trying to adjust the throttles on a 225 OX66 Yamaha.

After searching various threads I found that the TPS needs to be adjusted to read .50 volts with throttle plates closed.

And WOT should have a voltage of 3.2-3.8 volts.

I cannot however find what the volts should be at idle. Does anyone know?

Also I feel like I need to adjust the throttle so it is more open at WOT and showing closer to the 3.8 volts but when I do this the idle RPM is way too high. Am I still getting the full throttle power with only 3.2 volts?
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Old 08-06-2011, 06:12 PM
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what is the issue besides trying to adjust idle , which you generally do with the cable ??
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Old 08-06-2011, 09:52 PM
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what is the issue besides trying to adjust idle , which you generally do with the cable ??
The throttle plates still had some travel in them when I went WOT, so I felt that it wasn't getting to max power. But now the idle is too high so I am trying to adjust so both work.
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Old 08-07-2011, 07:03 AM
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The throttle plates still had some travel in them when I went WOT, so I felt that it wasn't getting to max power. But now the idle is too high so I am trying to adjust so both work.
The TPS has to be adjusted with the throttle plates fully closed. You may need to adjust (unscrew) the idle screw and check the synchronization of the throttle plates first. All plates must be fully closed. You may need to undo the throttle cable too.
When all that is done, you can adjust the TPS. The actual upper limit is not that important, what is important is that the TPS has continuity all across is motion. That can be checked with the connector undone and with an ohmmeter. Then check the initial voltage reading
after all of that, the idle screw is used to adjust idle speed ( about 730 rpm for that motor) with a warm engine. If the thermo sensors are bad, the idle won't set correctly.
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Old 08-07-2011, 07:24 AM
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have you cleaned and tested O2 ? yes the tps has adjustments but i think you are aiming in the wrong direction
you do need to link and sync but should never have to adjust idle screw
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