di kaya lalong lumakas?? just have your carb repaired/overhauled muna.. if there are powder dust inside, due for replacement na...
ok ba maintence mo sa sasakyan? baka binibirit mo masyado para magkaroon ng hatak?how's your ignition systion naman(plugs, h-tension wires, distributor,etc...)
yup, you can buy jets alone. you may use smaller jets but less power. isa pa, tagaktak ang tunog nong valves mo pag sakal. brod, better try using kia B1 carbs. have somebody do it for you,machine shop could make an adaptor for the kia carbs. matipid talaga, its FC would be around 14-16 km/L. just give it a try. surplus kia carbs here in davao costs around 1k. goodluck on your new project.