We cannot install kick starter in the Avenger 150cc bike. There's no point in doing this, firstly because your warranty will go void and secondly electronic technology has improved significantly and there's no need of a kickstart. Installing a tail end seat is possible. You can get the one seen on the Bajaj Avenger 220. The avenger 150cc is an affordable cruiser, it is powered by 149cc engine which delivers 14.3 BHP @ 9000 rpm and 12.5 NM @ 6500 rpm. The engine is mated to a 5 speed gearbox.