I ordered a kit from Hotspark (http://www.hot-spark.eu/webshop/) for Peter's bus and replaced the old pieces tonight, and wow what a difference!
Now the engine starts super easy and the idle is smooth as never before. If you ever want to make an old engine better, don't hesitate to buy one of these kits.
I also covered the "box" and the compartment top cover with bitumen plates tonight. They are thick tarmac like plates with a tape side. The material itself is super dense and kills vibrations very good. Tomorrow I'll make the new surrounding. I'll fill it up with isolating material as well hoping for a quite bus.
I do know that a second muffler will change the sound as well. Must to that I think.
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