help once again replaced rod bearings still knocks

[jswan44]

alright i went to a mechanic they said that the rod was making noise wasn't valves. i tore it apart and the 4th piston rod had movement the others was tight. put new bearings in the rod and there wasn't any movement. i put it back together and there was still a loud noise. not so much of a ticking but a rough noise. like it wasn'th getting any oil. it was only on the 4th piston area. is there anyone can help me. i would take it somewhere but they told me to buy a new engine it would be cheaper. please help
thanks

[jlh1969]

Hi! my hubby has a very similar problem. Does the noise kind of sound like a sewing machine running? His sounds a like a sewing maching with no lubrication.

[RichLockyer]

If there is an oiling system problem in the block or crankshaft, that would have caused the original bearing to wear and will cause the new one to wear quickly.

[jswan44]

yea it does sound like that i took it apart again and i tightened the rod bolts to tight but i'll check the oil pump and make sure it is operating alright.
well thanks i'll let you know if i get it to work. i'm waiting for parts know
thanks

[Charlie Gary]

What kind of bike is it? There were some gpz550 engines that had nasty burrs from a dull boring tool smeared over the oil holes, especially for the last rod bearing. These engines tended to have bearing failures.

[jswan44]

99 zx6r