Question about 1987 Honda NSR 250 MC 16

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How to set up power valve cables from servo

The motor was stripped and I don't know how the cables are to be installed I don't know what cable is pulling and pushing

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Posted on Jan 02, 2017

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SOURCE: fitted a new exhaust, removed the cable from the

yes the servo has to b in the original position before the cable removal

Posted on Mar 28, 2009


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What and where is the servos

  • A servo is a mechanism, usually a motor of some sort, that drives another mechanism. On a passenger aeroplane, for example, the control surfaces are too difficult for the pilot to operate because there is so much wind pressure against them, so they use hydraulic servos to move the elevator, flaps etc.
  • On a car, the drive by wire throttle control is a servo, which is electronically controlled by the computer, depending on the throttle position under the driver's foot.
  • In effect, the power steering ram on a car is also a servo, which is powered by the p/s pump, and controlled by the valves in the steering column.
  • On a smaller scale, the air conditioner has servos that open and close the relevant air duct flaps when the dashboard controls are shifted to control the flow of air in the car. Please note that on older cars, and some new ones, these flaps are not controlled by servos but by cables.
  • The remote controlled central locking on a car has servos in the doors that open and close the door locks when the remote button is pressed. On some cars these door lock servos are small electric motors, on others they use vacuum operated pistons, also called servos.
  • Hope this answers your question!

Feb 16, 2015 | 1999 GMC Jimmy

2 Answers

Motor servo stuck r1

Your after market exhaust should have instructions about what to do with the exhaust valve. I would suggest that you contact the exhaust manufacturer and ask for their advise. They will have dealt with this on a regular basis.

Sep 10, 2013 | 2001 Honda CBR 929 RR Fireblade

1 Answer

How do i solve servo motor high error in solvent printer

Please follow the steps below to hard reset the printer and let me know the result.

1.Remove all the cables from the printer.

2.Wait for 10 mins.

3.Connect only the power cord and try to power on the printer.

4.If the problem is solved, then connect all other cables, otherwise let me know.

Aug 28, 2012 | Office Equipment & Supplies

1 Answer


Your EXUP is the butterfly / valve that is in-line between your center muffler/Cat and the stock exhaust can. It is controlled by cables from a servo motor under the tail / behind the rear shock.

The EXUP errors (17 and 18) are because:

1. you removed your EXUP servo and/or valve when you installed your exhaust.

2. your EXUP valve is stuck / cables are seized up

3. your wiring harness is disconnected from the servo motor.

Jul 15, 2011 | Yamaha NC 110 Motorcycles

1 Answer

Heater does not work. What can be the cause of the heater blowing cold air? I flushed the system and changed the water pump and thermostat but still blowing cold air.

I assume you actually touched the water hoses to make sure they are gotting hot?

But hot water to the heater hoses, does not mean the heater valve is opening and letting into the heater core. Most valves are operated by a vacuum servo these days, although some still use a cable. Have someone operate the lever back and forth, while you watch to see if the valve is getting movement.
If not, it could be the cable, or it could be lack of vacuum to the servo, or it could be the servo is leaking, or it could be you have a computerized climate control that is trying to regulate temperature and not working. The valve is usually out in the engine compartment, because it still get hot even when closed, and you don't want that inside the car in the summer. So you should be able to see if it is cable or vacuum. And you should be able to manually move the cable, or supply direct vaccum to the servo. If you then get heat, you know what it is then.
If you don't get heat even with the valve open, there could also be a temperature regulator. That would be likely under the dash, and is designed to allow exact temperature modualtion, like when you want one side different from the other. And then you run into computer controls again, where I don't have the model experience to help.

Mar 03, 2010 | 1999 Ford Taurus

1 Answer

Check engine ight came on and 18 pops up

#18 is the EXUP servo motor
If you have installed an aftermarket exhaust slip on and you have removed the stock cables you still have to leave the servo motor on the bike connected to it's plug.

Jul 02, 2009 | 2007 Yamaha YZF-R6

4 Answers

Yamaha 2001 r1 been stood for 2 yrs ;got back on road ;rev needle keeps going from 0 rpm~~7000rpm all the time;bikes runs but must of lost half the power of the bike ????

Hi There,
Got this from my copy of the Yamaha workshop manual for this model

The YZF-R1 features a self-diagnosing system for the following circuits:
1. throttle position sensor
3. fuel level indicator light
if any of these circuits are defective their respective condition codes will be displayed on the tachometer when the main switch is set to "ON" (irrespective of whether the engine is running or not)

1. throttle position sensor a) Disconnected b) Short-circuit c) Locked 0 - 3,000rpm
2. EXUP a) Improper connection b) Short-circuit c) Servomotor is locked 0 - 7,000rpm
3. Fuel level indicator light a) Improper connection 0 - 8,000rpm

It looks like you have a problem with the EXUP Valve on yours, probably seized or maybe cables not moving freely
Hope this Helps

Apr 25, 2009 | 2001 Yamaha YZF-R1

1 Answer

Does anyone know what error 35 means on 2008 cbr600rr

Error 35 means your EGCV servo motor
under the seat has stuck.
It has a 6 pin connector and
cables attached to it that go
to a valve on the exhaust.
IT has a cover on it, just open
it up or remove the whole thing
and connect it to a battery to see
if it turns. Could be the cables too.
Clean the connectors also.

Feb 08, 2009 | 2008 Honda CBR 600 RR

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