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Hi Adam,
That's the way to do it!
There are (at least) two types of manifolds sold for the Weber IDF carbs. One is a bit wider than the other. For the wider type the engine tin around the manifold has to be adapted - read cut - to fit around it. This setup makes makes it very hard to take the plugs out. I know, because one of my 912's has this handicap.
For the plugs I use a socket with a thin extension bar. The socket should be just long enough to fit over the plug. The thin bar enables me to guide the socket correctly on the plug. Then just loosen the plug. To turn it out of the thread and take it out the "cavity" I push a piece of tight fitting rubber hose (appr. 10") over the ceramic neck of the plug. The plug can be turned out - and in - quite easily, without the risk that is disappears somewhere under the engine tin. If you don't have the proper socket, try to get one or modify one for this purpose.
Try to get a leak down tester. It will give you some quite reliable basic information regarding valve leakage and/or possible leaking/worn piston rings.
And don't forget to look for one of the reccommended distributors...
Keep posting the results and don't hesitate to ask for more info.
Otto
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