Hai chetta. Enne sir ennonnum vlilkanda....❤️❤️❤️ Oru vandide piston change cheyth new idumbol ath tight bore aayrikkum so friction kooduthal ayrikkum oppam compression num koodthal ayrikkum. Compression koodumbol higher rpm il detonation nu chance undakum. Engine seize aakanum idayund. Oppam thanne valve clearence kurav aanengil, over Heat moolam metal expansion vannu tappet rod bend aakanum chance und. So after rebuild Tapet clearence idarund mechanics.. Better to drive the bike in retarded ignition for 2000km after rebuild.. Engane retard cheythal compression kurav aayrikkum oppam engine heat kurav aayrikkum... Appo tappet issues varilla.