Well the thing is I'm going to make my own fuel for my 4-stroke

But do I make a fuel like-

Wildcats: 18% oil, 100% synth
Wildcat recommends the lubrication package be totally synthetic. The use of synthetic oil is important in four stroke engines to prevent gumming and varnishing of the lifters and coking of the valves. Varnishing will occur on castor based fuels. This can lead to sticking valves, which will cause the valve set to get knocked out of time. Coking of the valves will cause improper seating of the valves causing a reduction in compression and incomplete combustion. Four stroke engines also have high exhaust gas temperatures and the use of synthetics greatly reduces carboning at the exhaust ports.

or like...
Omega: 17% oil, 50% synth, 50% castor

or like...
Powermasters YS 20/20: 20% Oil All-Synthetic

or more like....
Powermasters other 4-stroke fuel: 15% Oil Synthetic Castor Blend (most likely 70:30)
+++++

As you can see, you can get a 4 stroke fuel anywhere from 15 to 20% oil and anywhere from 0% to 50% castor. There are bigger differences in 4-stroke fuel than 2 stroke fuel.