Interesting problem. I have an '82 CXT and if I use full throttle the fuel system light comes on probably due to a sticking waste gate. However, if I use about half throttle the light doesn't come on and I get phenomenal acceleration when overtaking in top gear from about 60mph. I assume that I am getting more than the designed boost of 19psi using it like this and as long as I don't experience any mechanical failures like it is I prefer it the way it is and adjust my throttle use to suit. Sometimes the waste gate doesn't stick and the boost builds more steadily, probably as designed but it isn't half as exciting or fun as using it the way it is. It is far more driveable and has much less turbo lag the way it is and yet still returns over 50mpg. Maybe there's a case for altering the wastegate opening mechanism to simulate my experience but I wouldn't advise it for possible reliability issues. But, the way it is, I love it's instant punch in top gear and would be loathed to "fix it" permanently. I remember reading about experiences with some aftermarket turbo instalations on normaly aspirated bikes and they had adjustable wastegates to allow you to choose the amount of boost you wanted. I wonder if this is possible on the CXT by some simple modification and will investigate as an exercise soon. I will add that I do not get any detonation problems as it is and the bike accelerates as smooth as silk, just extremely rapidly, all it requires is measured throttle use. I am now used to it to feel when the excess boost will suddenly open the wastgate and trigger the warning light, and use the throttle to keep boost just below that threshold and wow, does it fly!!!
Andy.