Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Don't put a dishwasher tablet in unless it's a non corrosive type, otherwise it may send all the alloy black. It will also make any steel parts, like the liners go rusty immediately. Maybe consider an acid dip clean (needs to be done professionally) to get all old paint/oil/sh*t off, achieves a far better result.
Industrial parts washers use chemicals but, non corrosive and also an inhibitor to stop them rusting.
I have put a complete cg engine in the dishwasher that came out spotless.A few rocker covers,Cylinder head,carbs and now a wiring loom all with a dishwasher tab and all were fine. WD40 on the liners is a good idea I did the same to prevent rust
Take the gear selector drum out and you will have room to remove the cogs You don't have to take the drum apart. If you remove the natural switch (that is under the engine) the whole drum will pull out.
Follow this link Phil, it may be of use to you.http://www.sohc.co.uk/index.php/topic,10783.msg78781.html#msg78781