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Hi Christer, I hope you are enjoying this as much as I am! hehe... >To make full use of a EFI setup you would really need to know what You are doing and use all types of sensors, otherwise it will be more primitive than any carb setup. and carbs aren't primitive? Only been around 100 years... >I know what a MAP sensor is ,I work with dynoing engines at a engine research center. Then you should have kicked my ass on this discussion by now - I'm an amateur! >Yes some sofisticated EFI“s can adjust for different flows but then You would need a map sensor in every inlet rubber, on a carb setup the stronger signal will just pull more fuel in that carb, nothing of major concern but nevertheless. No, you could just adjust the fueling/ignition on each cylinder against a brake dyno. >Yes Your van have EFI (to clear emission laws) but a Yamaha R1 (who makes 150hp/litre) doesent , understand My point? Yes, now I do. >You may be able to buy an ECU for £650 and injectors for £15 ,but I doubt that John Doe can walk into an speed shop and get a nice EFI setup for that amount. I AM that John Doe! No, I didn't walk into a speed shop, i just hunted around. >Besides you need alot more than ECU and injectors, throttle bodies and a box full of sensors ,wires ,not the cheapest stuff around. The carbs are already on the bike True, but you are coming back to cost, the one point I concede. >How fast do I wanna go? well the old setup easily made 200mph and the new one is more powerful. As I said in an earlier mail Mark Moisan out of texas made 429hp ...and Terry Kizer made 494 on his EFI ZX11... Cheers Lorcan