1972 L200 with Z1100 engine (2 cyl 21 HP) I have found the problem but do not know how to service it. last winter the engine just started to loose power under load and would stall. then it would fire but would not start. I have completely serviced each element along from the fuel tank to the fuel pump and injectors. now it starts and runs but the throttle range is very limited. it runs at high RPM and white smoke comes from exhaust. it would appear that the governor and/or automatic fuel control device are either stuck or out of adjustment. So how does one service them?