22-11-16, 09:29 PM
The effect on the rubber/plastic parts could be bad if there's any fuel in the tank or carbs, 3 or 4 months trapped in an atmosphere of petrol vapour might well make the seat vinyl go brittle for example. The advice to empty the fuel system completely is worth following if you go down this route.
If you've somewhere dry to store the bike then that and some ACF50 should be fine.