In theory it is quite simple, but having seen someone go through the process, there do appear to be lots of small issues to overcome to make them
reliable which all take time and money to develop, only to end up with a car thats not much quicker than a decent single engine'd Busa.
The Z Cars transfer box is expensive, but when you consider theyve probably only ever sold half a dozen of them, you can see that there's such a
small market for it that it is always going to be expensive due to the time spent developing it as well as making it. It could be made simpler if you
didnt need reverse, but its still going to cost quite a bit to get manufactured as a one-off.
The chain drive Gazza mentions sounds interesting but I dont know if its been tried much before, so putting you in the same R&D boat again? I can
imagine the difficulty may be in getting the chain drive from the second engine reliable, for example you couldnt use a normal centre bearing because
that has too much play in it and wouldnt like the side loading from the chain. Also I might be off target here but when running a small length chain
isnt there some limitations on how small the sprockets it runs around can be, ie would the chain wear a lot quicker if shorter and running round two
small output sprockets rather than round a large back sprocket a on the bike?
Don't get me wrong I do like the idea of a twin BEC, Im just trying to put forward as many of the pitfalls as possible before anyone decides to
do it on a limited budget because if you go into it thinking that its just the cost of the additional engine plus a few other bits and bobs,
you're going to run out of money pretty quickly! 
Chris
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