RC VALVE

WULL · Guest

COULD SOMEBODY GIVE ME A LAYMANS TERMS EXPLANATION OF WHAT THE RC VALVE ON MY 92 NSR DOES ,JUST CURIOUS

Hunter · Nitrous Nuisance Joined: 01 Mar 2002 Karma :

In laymans terms..

The RC valve is bolted onto your engine (where the engine connects with the exhaust). The valve starts to open when the RPM is 7000 or more, and also when the engine RPM is less than 2300 or so. I.e. it stays shut from 2300 to 7000. The whole point is to give you a wider power band, so the bike feels more powerful throughout the rev range.

Thats about it!!

Oh and its also the most unreliable piece of metal on your bike cause if they are not cleaned up quite regularly they tend to get stuck and cause loss of power.

Smile

Guest · Posted: 17:59 - 01 Aug 2002 Post subject:

hi
the reason the rc valve get stuck so much is because the fully sim oil used dose not fully burn under 5000rpm so if the bike dose a lot of town work then it is best to used semi sim oil witch does burn better under 5000rpm.it also keeps the exhaust cleaner. semi sim seems to work better on my bike but some people might not agree.

Keen · World Chat Champion Joined: 03 Apr 2002 Karma :

RC valve = power valve ???

Scotty · Scooter Boi Joined: 31 Jul 2002 Karma :

When you say cleaned up quite regularly, how do you mean, how do i look at the valve to make sure its fine, and how to clean it and with what. Ive heard that they are the most unreliable things, As i think the TZR has one?? and my mates said somming like to blew or something or other and his engine wont work. I only see him at college every so often, and wasn't particualrly intrested when he was talking about it.

Scott

Hunter · Nitrous Nuisance Joined: 01 Mar 2002 Karma :

The RC valves get stuck because carbon deposits on them causing them to seize, especially on certain oils and if you are running a mixture with a high oil/fuel ratio.

Cleaning up the valves is a bit of a tedious task especially if you don't know much about them. I have checked them briefly by remove the timing pully cover on the NSR and check if the valves move about quite freely. However, its better to take the head off occasionally and have a look at these to make sure that there is no excessive wear on these. The metal that these are made of aren't the best usually and tend to wear out after a while.

The problem with seized RC valves is that they actually damage the servo drive, which is quite expensive to replace!

A general service on the RC valves would be remove these from the cylinder and scrape out carbon deposits, check valve clearance, check valves for excessive wear and re-fix. It maybe a good idea to buy some RC valves if you come across these at low price as its good practice to replace these before they knacker any other bits in the cylinder or servo.

Smile