X-Pro 150cc // Vader 150 // Lifan 150

[ProDigit]

I recently did another highway run, and while tucked, behind a car, and with a tail wind, I got highest top speed with stock tires and a 19/29t sprocket setup, I found with the bigger diameter rear tire (140 70 12) from stock (130 70 12) resulted in a loss of about 2-3mph top speed.

In order to combat those losses, I will do what I did with my Honda Rebel 250, and can be done with any carbureted bike, is add about 1oz of 2stroke oil for each gallon of fuel.
This will lubricate the top side of the piston.
I was actually surprised the Honda mechanics could see the oil even on my VT750, but couldn't locate any leaks.
I told them it was a fuel additive, but in actuality it is 2 stroke oil.

1oz of oil per gallon of fuel is easy to remember. That ratio is 1:128.
The effect is noticeable from 1:100 to 1-300, with 1:100 giving exhaust fouling,and possibly bad for the catalytic converter, and 1:300 ratio making nearly no difference compared to just fuel without oil.

On the Vader 150 with a 1.5 gal fuel tank, I think 1oz of 2 stroke oil per tank will be close to ideal (1:200).
It should increase torque and top speed.
One of these days I'll test it out on the Vader.

I'd be much more cautious on a fuel injected bike, since the oil could throw off the stoichiometric ratio of the combustion, requiring more fuel per air to be injected.
The exhaust deposits could also clog catalytic converters, and clog or immobilize O2 sensors.
Maybe If I ever get tired of my Xpect, I'll do some testing on that with adding oil to the fuel.

Using used or new engine oil won't work as effectively as 2 stroke oil, and show a lot more smoke. Using used oil can also clog injectors, carburetor jets, fuel filters etc ...