motor is making a rod knock sound after 2500rpm's...what do i do? i want to rebuild it as i have another vehicle that i can use for a while. i found this rebuild kit http://www.ahwooga.com/detail.asp?id=13962 it also gives options on this: Pistons & Rings Available in ( STD. .020 .040 ) Bearings available in ( STD. .010 .020 .030 ) which of those would i need?