No wonder us old farts and our 70's bikes we own and ride , have got a hankering for the simple life .

When I got my first Bultaco M 80 in 1976, I rode that bike to work every day on the road, trialed evenings and weekends, and when it needed fuel, go to my local esso station, gallon of fuel, 2 shots of oil from the big red oil dispenser gave about 30:1 from what i remember, Never had engine problems from that bike.

You have to check your plug it is the only indication to how you engine is running so if it's white I would jet it up one to two sizes at a time and check the plug it should be a biscuit brown colour. If your going from 50.1 to 100.1 it's a 50% cut I oil which will make it run rich but adding more oil can lean off the mixture . But its up to you what you do just don't kick some one down who is advising you.