Originally Posted by Racing4Evo
Maybe you can have someone that is experienced with engines take a look at the fit between the conrod and crankpin. He should tell you if you need to replace the rod or not. I have a JP that has over 4 gallons without a rod change. Someone with a machining background checked it out and said the fit was practically like new.
Is not a matter of material wear, is purely a matter of fatigue of materials, after a break-in, the bronze bushing and the aluminium that surrounds the crank pin and the piston pin
could be fatigued with micro cracks that can ruin the engine if the material fails.
On a .12 haven't found a conrod (if the engine has had a correct maintenance) that bronze bushing has been worn and needs to be changed. But sometimes sh*t happens and the conrod you saw in perfect shape, shits himself at the backstraight at full throttle and nothing is more scary that hearing your engine and thinking you were deaf suddenly because you don't hear the sound.
