Power valve help needed

**Fri May 04, 2007 5:29 am » Post: #1 » Download Post**

So its not all plain sailing and i am having major power valve problems! Crying or Very sad

When the ignition is turned on the power valve servo doesnt move at all. When tested with a test light and when shorting the blue/black wire the servo moves so suspect one of the control modules are defect. Either the one under the seat or the one behind the RH rear side panel.

Does anyone know what may be the problem or have some suggestions please? Its an '88 MC18 J2. Cheers!

**Fri May 04, 2007 5:33 am » Post: #2 » Download Post**

There has been some talk of the difference between the 88-89 MC18 model MC18's

Some seem to sweep the servo, while others don't. It looks like the PGM-II does (1989 R5K) and the pre PGM (1988 R2J) doesnt.

Try removing the petrol tank, start the engine and then gently blipping the motor to over 3k watch the servo motor. If the servo motor sweeps from LO to HI then there is nothing wrong.
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If I have to take the carbs off once more...

**Fri May 04, 2007 5:44 am » Post: #3 » Download Post**

Thanks stephen i will try that but i will have to wait til tmrw or even monday as the bike is at the garage. Hopefully it will be ok then but if not il b back for more suggestions!!!!! Thanks again

**Fri May 04, 2007 9:26 am » Post: #4 » Download Post**

There are differencies, this is what I wrote a while back about my two MC21s:

1. MC21SE 1990, standard wiring loom, kiss box.
a. If I turn off the power, remove the connector to the carburator transmitter, turn on the power. Then the RC valve opens.
b. If I turn off the power, open the gas fully,turn on the power. Nothing happens!

2. MC21SP 1993, HRC wiring loom, HRC box
a. If I turn off the power, remove the connector to the carburator transmitter, turn on the power. Nothing happens!
b. If I turn off the power, open the gas fully, turn on the power. Then the RC valve opens.

Has anyone seen this ?

Any explanation ?

Number 1 looks like the standard but with so many people cleaning and adjusting RC valves, someone must have seen number 2 ? Can it be I have a PGMIII F3 , if such a thing exists ?

Try it on yours!!

But just try to start it and blip the throttle, if the valve moves its probably working correctly. Then you could just check alignment.
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

**Fri May 04, 2007 1:40 pm » Post: #5 » Download Post**

There is no PGM-III F3 so its not that.
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If I have to take the carbs off once more...

**Sat May 05, 2007 8:10 am » Post: #6 » Download Post**

Ok i removed the tank and blipped the throttle to over 3k but there was no movement or life at all!

Does this mean there is something terminal?

**Sat May 05, 2007 9:14 am » Post: #7 » Download Post**

over 3k

How much over ?

It should be more than 3500 maybe 6-7000rpm
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

**Sat May 05, 2007 12:36 pm » Post: #8 » Download Post**

They will be fully closed again well before 5k.
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If I have to take the carbs off once more...

**Sat May 05, 2007 10:15 pm » Post: #9 » Download Post**

First i blipped it upto and over 3k but then increased it a few times upto 5k and well over. The very first time i revved it, the servo spasmed briefly but did not move at all really and after that absolutely nothing.

**Sat May 05, 2007 11:38 pm » Post: #10 » Download Post**

According to the big blue Honda book of words, the R2/4J servo should rotate to "HI" at 2000rpm.

There are 2 different setups for the RJ. One uses a single RC Valve control unit, the other uses a primary and auxilliary controller.

You'll need to trace the colours out of the servo back to their respective box(es) and I expect you'll need to replace it (or both). You may be lucky however, and find it's just a bad connection or earth (ground).
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Andy.
NSR-WORLD.COM

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**Sun May 06, 2007 9:10 pm » Post: #11 » Download Post**

Thanks andy will get onto this asap

**Sat Jun 30, 2007 10:29 pm » Post: #12 » Download Post**

i have a question, my rc-servo turns and sometimes not turn i can feel the torque coming from the engine, mostly it starts normaly but keeps on the hi position without any response.
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feel the wind

**Sat Jun 30, 2007 10:33 pm » Post: #13 » Download Post**

my normal means to go to hi at 2000 and turn to low at 3000rpm. but it sometimes keep on high with no response, i have to kill the engine and restart it to make it normal. but then for a little while same thing happens. help needed.
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feel the wind