Do you need a harley funnel to get oil into the primary or is there enough room to get a small funnel in on a 103 primary?

I only need a small funnel on my 96 cube. Not sure on the 103. It only takes just over a litre so no biggy.

I used a small funnel on mine. You could even cut a small corner off a plastic lunch bag if you don't have a funnel small enough?