im AM BUILDING A 1985 250R THREE WHEELER WITH A 550 4CYC MOTOR OUT OF A 1982 YAMAHA STREET BIKE NEED SOME IDEAS :? PLEASE HELP

If your 250R still has all the wiring run all of the Yamaha wire through the same holding points. You won't be able to use the Honda wire so just pull it out. Use everything you can use from the street bike( control, switches, ect.) Try and keep the headlight and tail light housing, just use your bulbs and connectors in them. You will need a battery box so try and use the mounts were the tool box is located and discard the tool box. Good luck post pic's if you can...

I trust you already have the sprockets lined up with each other.,.,