Hello bros, when my mech dismantle my ck 4g93t's head 2 days ago, i found out that there're obvious difference amount of carbon deposits on the pistons..pistons on the far left and right got very less amount of carbon deposits compare to the middle two..the differences is very obvious as the carbon deposits on the middle two is atleast 2 times thicker compare to the left and right..wat could be the prob?..anyone who faces this prob b4 kindly share your solutions..thanks in advance..