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st400f

siezed lower end

8 posts in this topic

well after three and half years of racing the bottom end finally gave up the ghost .how long should you get out of a lower end ?any tips on a rebuild i should know about ? thanks st

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I'm not sure about the expected time, but did you find out why it seized? That sounds unusual to me, sounds like an oil related problem (not enough oil getting to the rod bearing). Was the crank blued at all near the rod pin?

On the other hand, are you sure that the bearing didn't break which in turn caused it to seize? If it gets loose and has excessive play the the rod bearing or the rod itself can break. Be sure you find the cause before you put it back together. If an oil line is plugged or something then you won't know until you fry a brand new rod and crank.

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Hey st400. When I took my crank apart it was blue from getting hot. When I was dissasembling my cases my oil filter was collapsed, so I probably was not getting adequate oil flow. This could have been caused by my valve shim bucket falling apart on yhe bottom edge. When I took out the filter there was a lot of shavings around it. In your manual it tells you a way to test your oil pump to make sure it is working. Also check your oil lines to make sure they are claer. GOOD Luck-C-ya

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Im sure you already knew this, and i probably sound like an idiot saying it... but while you're in there, make sure to replace all the other bearings, seals, ect... because if you dont, then probably pretty soon everything else will start going. If the bottom of the rod is tight, but everything else is worn, then that could cause more pressure on the parts, thus a much bigger bill if you dont replace them.

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Im sure you already knew this, and i probably sound like an idiot saying it... but while you're in there, make sure to replace all the other bearings, seals, ect... because if you dont, then probably pretty soon everything else will start going. If the bottom of the rod is tight, but everything else is worn, then that could cause more pressure on the parts, thus a much bigger bill if you dont replace them.

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