Try writing to JBA:

http://www.jba-engine.com/showProduct.asp?ID=223

Is this your engine Ashok?

http://www.himodel.com/engines/VMAX_46_ABC_Engine_for_Airplane_W_Muffle.html

sphere hobbies owner Mr nilesh doshi is good person and Mr probbir i know him for more than 16 years and he is very expensive for hobby than other hobby shops and now Mr nilesh is mainly dealing with quard and hexacopter made by dji

No sir, not this one,
may be this Pics could help.

Do not disturb low speed needle from factory setting if you are New. It is very difficult to get back correct settings. Usually any engine is three full turn open of High speed needle for Priming and initial starting of engine.

Sputter and Engine cut on fast opening of throttle is an indication of Rich Fuel Mix. close by 1/8 of turn at a time till half turn the HS Needle setting till you reach consistent throttle. Best way to do this is to open throttle slowly without engine cut till WOT and now close HS by 1/8 of turn at a time till half turn (or more in your case) of the HS Needle setting to reach Peak RPM, now open again HS Needle by 1/8 turn. Now you should be able to open and close Throttle with good response of engine.

At last,
After a month old struggle with this engine, ive got this working.
unscrewed the LSN a quarter turn and washed the engine complete with a liter of IPA,dried, oiled, now its working fine like a new engine, screaming to top RPM on WOT. Heats up a little but not much.
Thanks Sanjay sir for your support. you were really helpful from the beginning.
thanks to Sundaram sir too.

Ashok.P

Congratulations Ashok. Happy Flying and Smooth Landings

Congratulations Ashok. Happy Flying

Congratulations sir

Congratulations sir wish you smooth flying and landings too!!!!