Q.No : 7

The scooter made by Enfield India limited is called - Fantabulous

"Between the fifties and eighties, the company introduced variants like a 175 cc mini-Bullet, a 175 cc Fury, a 100 cc Explorer and even a 175 cc scooter called Fantabulous"

Source - Here!

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Q.No : 5

CV and BS in Carburetor design..

CV style carburetors - Constant Velocity (CV) Bing(TM) carburetor

Source: Here!

BS style carburetors - ‘B’ stands for butterfly valve and ‘S’ for SU, designating the maker Skinner Union.

Source - Here!

Q.No : 2

OHC - Overhead camshaft

Overhead camshaft, commonly abbreviated to OHC, valvetrain configurations place the engine camshaft within the cylinder heads, above the combustion chambers, and drive the valves or lifters in a more direct manner compared to Overhead valves (OHV) and pushrods.

more Here! and Here!

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Q.No : 6

What is "GS-150" ?

Mr. Google says it could possibly be the Italian Vespa - GS150

The Vespa GS150 series reaching from VS1 to VS5 is one of the most appreciated and sought for Vespa models nowadays. Primarily because of its rounded cowl and attractive lines where the seat follows the rounder shape of the chassis in a characteristic way. It has a, for that time, quite alert 150cc engine giving 8 hp at 7000 rpm which resulted in a top speed around 100 km/h.

More info Here! and Here!

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Q.No : 10

Which was India's first 4 valve bike?

Yamaha R15

R15 Specs

India's first four valve & D-frame bike - is it the R15?

2 >= 3 valves bikes are TVS Flame and R15..!

3) What are the fuel alternatives For Diesel Enfield..??

Ans- three- Petrol, Diesel and Bio (gobar) gas

India's first four valve & D-frame bike - is it the R15?