I repainted the engine last year
http://foc-u.co.uk/index.php/topic,17483.msg201444.html#msg201444The Simoniz is excellent. Very easy to apply and once the engine has been run a couple of times to harden, very hard wearing.
My top tips would be
1) Expect to take a couple of weekends preparation. If the front of the engine is a bad as mine was, it's a long and tedious job, but absolutely crucial. You want zero grease, grime and oil on any of the surfaces or it'll be a job wasted.
2) Masking up also takes a long time. I just used newspaper and masking tape.
3) Take the forks off. It's not hard and makes access a lot easier. Obviously the radiator has to come off too and you may as well repaint the engine crossbar while you're at it
4) Take the cam cover off and do it separately. I stuck mine in the oven to bake the paint on. 120 degrees for 20 mins
5) Actually painting it takes around 10 minutes per coat! I did 3 coats in the end.
The results are bloody brilliant though. It's very satisfying once it's all back together and gleaming.