Q. What is difference between Apache RTR 160 & 160 4v?

There is only on difference. in old 160 their is 2 valve in the engine for the intake of fule and out after combustion. but in new 1604v their is 4 valve used for intake and out due to that engine can breathe easily and engine will generate more power and torque.

The major difference between the two is that the apache rtr 160 has 2 valves on the other other hand the rtr 160 4v has 4 valves

The no. Of valves of engies is more in 1604v for air intake...hence better milage..better pickup