24’ mc 250. Bike ran fine last time i rode it, pressure washed it and now when the bike is off the fi light is on and solid along with the hour meter (hour meter runs if I don’t disconnect battery). Every 2 minutes or so while the bike is off and lights are on, it sounds like the fuel pump starts up for a second then will do it again in another  2 minutes.But the bike starts and runs fine. Only an issue when it’s off and sitting. Anyone ever have this happen? Any tips ?

I think you narrowed it down yourself, the problem manifested after you used a pressure washer on it, so you now have water somewhere you should not have water and you need to dry it out.  Fortunately water evaporates so dismantle the electrics and dry them out and they will likely function again.   On a Montesa that would be the big plug with all the pins that connects to the black box, look for similar connection on your machine.  ... and avoid using pressure washers they destroy motorcycles as fast as they clean them.