deresrictor

phill.c · Traffic Copper Joined: 13 May 2004 Karma :

well im just about to get my restrictors out tomorrow, but browsing on ebay and i came across a derestrictor and it says it will allow my bike to go over 180kmh, so is there already a standard restrictor in there? ive got a cbr400, and are they worth the pennies? where can i get a new one from or is it not worth getting a new one. also are they easy to fit?
cheers
phill
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CBR400RR the funs started - Honda MTX 125 ongoing project when i can be arsed Smile

ZaphodBeeble · World Chat Champion Joined: 10 Feb 2004 Karma :

As far as I was aware you just have to remove the plates from between your carbs and the engine (inlet ports). The carbs may also require rejetting though but I'm not sure.
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Current bike: VTR1000F Firestorm. Previous: Firestorm (written off) - XJ600 Divvy - NSR125 - DT125 and a load of offroaders.

instigator · Super Spammer Joined: 19 Oct 2004 Karma :

Its worth checking for the restriction washers firstly and if they aren't there, then buy the item, as I believe the cbr400 is derestricted differently (in some electronic form Confused

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EuropeanNC30R... · Gay Hairdresser Joined: 20 Jun 2002 Karma :

In short....

When the speedo needle hits 180kmph it passes through a little light-gate/similar that results in a message being sent to the CDI telling it to cut two cylinders. It's like hitting a brick wall.

Some bikes have had this disabled by bending back a tab in the speedo, some have plug-in boxes behind the speedo, some have plugin boxes going into the CDI. You can also get around it with a kph >mph converter, or by just disconnecting the speedo cable.

Don't try to blindly pull the wire out as it'll result in the bike misfiring above 5,000rpm (crude anti-tampering idea).