i have a swift 88, it used to give me 155 km/hr, now after overhauling it gives me arount 145 km/hr.
i dont agree with some one that "the chasis were the diamonds in old version"
in case of khyber just change the flywheel, fit a heavy flywheel after that it will go upto 155 km.
the balancing and TYRE PRESSURE also need to correct for the achievement of such speed.
Secondly if someone is trying to achieve 140 in 4th gear, well it isn't an excellent ideas to ruin the engine . the 5th gear was introduced to achieve high speeds with lower rpms which provides better fuel consumption and less wear and tear to the engine.
