Best way to de-coke a 4T without taking the head off

knockout_bar · Scooby Slapper Joined: 06 Jul 2005 Karma :

Redex? I took the downpipe off today (getting the restricter out of it), and the port was completely black. So, I got the torch and took a closer look; the exhaust valve (what I could see of it) was completely black aswel. What's the best way to de-coke the engine? I don't want to take the head off because i'm no good with cams and valves.
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Milo · World Chat Champion Joined: 08 Feb 2002 Karma :

A good warm up followed by a very good long thrashing once she's thoroughly warmed up.
Redex may well help the process and certainly can't hurt. Thumbs Up

EDIT - is she's not roadworthy then I've no idea. Not tinkered with 4-strokes before.
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VFR400UK · Scooby Slapper Joined: 29 Jun 2004 Karma :

Squirt some red Ex up the exhaust port and leave it overnight.

mchaggis · World Chat Champion Joined: 09 May 2004 Karma :

Take the airbox off, set it at a high idle, and slowly dribble about 1/3 of a bottle of Redex or similar directly into the carburettor body. It worked a treat for me.
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BlackSheep · Trackday Trickster Joined: 22 Sep 2004 Karma :

Take the plugs out , pour 50 ml of redex into each cylinder , leave it for 30 mins , then place old rags over each plughole and wind the starter over a few times to blow the redex out , refit the plugs and start it up , it will smoke like a twat for a few mins then it's good to use , i've done this a few times and it works very well .
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mchaggis · World Chat Champion Joined: 09 May 2004 Karma :

Blacksheep, do you normally put the Redex into a hot engine?
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BlackSheep · Trackday Trickster Joined: 22 Sep 2004 Karma :

No i usually do it from cold , if you put it in hot it would probably just boil off , there used to be instructions how to do it on the redex bottles,
don't know if there still are , i've not had to do it for a while.
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fuzz · World Chat Champion Joined: 24 Mar 2004 Karma :

There are instructions for the three methods of using it on the bottle. Follow as per.
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