sam. before that. you should ask him . his 140Y on a14 ?
some 140Y mostly use a12 and a15 engine since teh a14 stuff very rare here in malaysia.
escavos : you planning to swap your engine ? if your 140Y on stock engine = a14 its a potential engine. do some minor modification on it, high cam ...
get a better carb such as : weber (twin weber or 4 throttle also can,need a right tapak and inlet manifold to fit).
if swap : 1.5cc n/a C20 vanette engine (most 120Y using it,maybe easily to pass jpj or puspakom)but if 1.8cc with turbo you can go for ca18det from S13,RPS13 or 180sx , 2.0cc n/a = S14 SR20DE , or 2.0cc turbo = S14 SR20DET puspakom :)
remember upgrade your braking system too :) .
playsafe :D