RC valves - Dont get it

DimmniBurek · Renault 5 Driver Joined: 26 Mar 2005 Karma :

Hi, I am searching here for some info about this RC valve, but I still dont know what and ehere it is, I own a NSR 99´. My friend send mw this picture, bu t he didnt knew where can I find this valve, can anybody post the real picture of this on NSR?

https://www.bikechatforums.com/download.php?id=19497

Sorry for bad english
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cagiva gezzer · World Chat Champion Joined: 17 Mar 2003 Karma :

different engine, but should be the same place.
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DimmniBurek · Renault 5 Driver Joined: 26 Mar 2005 Karma :

Aha, I know where it is, now, can you tell me what does it do?

And how should I adjust it?
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mr jamez · World Chat Champion Joined: 04 Aug 2003 Karma :

It is a valve that sits in the barrel just after the exhaust port, at low revs it is closed making the bike a little more rideable, then at around 7krpm it opens up and you get full powah! (very simplified explanation)

The manual will tell you everything you need to know about adjusting it.
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DimmniBurek · Renault 5 Driver Joined: 26 Mar 2005 Karma :

OK, but what is this picture in first post? Do i have to mold that cover off or what?

This is RAVE valve which aprilias have, right?
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mr jamez · World Chat Champion Joined: 04 Aug 2003 Karma :

Yep undo the two bolts and remove the cover, then use the adjusting nut on the left hand cable. You HAVE to use the manual to get it properly setup.
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NSR 125F > BROS 400 > NC30 > BROS 400 > Trumpet S4 > '97 VFR 750

DimmniBurek · Renault 5 Driver Joined: 26 Mar 2005 Karma :

I am almost 100% that in the manual does not write anything about setup, what about the picture in first post? This is for NSR as I know
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hproduction · L Plate Warrior Joined: 11 Aug 2005 Karma :

NSR 125 R 99. Been reading some replies from you and I need help. I need to know where the powervalves is/are so I can clean them. Also my Servo, i'm not sure how it works but it's always on Low. When I "Key-on" it twitches but remains on Low. Rev up to 6500 and over it still remains on Low. Is this right?? I need your help.

I believe it could be something to do with the CDI maybe?

Thanks

mr jamez · World Chat Champion Joined: 04 Aug 2003 Karma :

hproduction · L Plate Warrior Joined: 11 Aug 2005 Karma :

Thanks a lot Mr. James! I will try it today.

Also, how is the Servo Motor suppose to react? I can't really understand that diagram.

Please let me know. Thanks
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DimmniBurek · Renault 5 Driver Joined: 26 Mar 2005 Karma :

What is this on the picture? When I start the bike it moves, and when ~6500 rpm is reached too
https://www.mobisux.com/album/data/500/32930IMG_9062-med.jpg

This is under the fuel tank
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hproduction · L Plate Warrior Joined: 11 Aug 2005 Karma :

Thats the Servo motor my friend, A diagram is at the top of the page. Look closely ad there should be a pointer and High or Low markings. Please tell me when you tun the key. Where is it pointing and does it just twich or move completely? Also when you go above 6500 how does it move and where is it pointing?

This would really help me as mine might be broken. Thanks
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DimmniBurek · Renault 5 Driver Joined: 26 Mar 2005 Karma :

Your friend will give you info soon...

So this servo controls the RC valve?
Do I have to setup both or just the servo?

The bike runs properly, but my friend told me that this is like a restrictor, and the bike runs better if this is set properly?!?
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Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

You do not adjust the servo, just the cables that connect the servo to the valve.

It is not a restrictor (although I understand that some French market bikes are restricted by closing the valve at high speed, but you cannot stop this by adjusting it), but needs to be set up to give you full power at high revs (if it does not open fully then you will not get full power, just as if it does not close fully you will loose some power at low revs).

I would not like to try removing the RC valve from the engine with the engine in place. It is fiddling to do with the top of the engine taken off the bike. Not sure that they stick very often anyway.

RAVE is the Aprilia / Rotax power valve system. These are a simple and light system, but are prone to sticking (but can easily be removed and cleaned up with much work compared to the NSR).

All the best

Keith
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yaut · Derestricted Danger Joined: 07 Dec 2005 Karma :

My nsr refuses to rev above 7500revs in 5th/6th.
I've taken the exhaust off my nsr and this is what I see through its port.
Q#1: is this the way rc valve should sit in there?
Q#2: is it possible to operate it by hand? just to check if it's working properly?
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