yz400f needs connecting rod bushings!!!help!

8 replies to this topic
  • bchopin19

Posted May 11, 2009 - 11:53 AM


I have found a 1999 yz400f that needs connectiong rod bushings, the guy has the motor all apart and he says that the crank has 1 heat spot on it also, the bike has a white bros. exhaust and pro taper bars, I was wondering if this would be an easy fix or not, he says the whole top end is new, just want your guys opinions, the bike is very cheap!!!!

  • bchopin19

Posted May 11, 2009 - 12:07 PM


I think the guy meant the connecting rod bearings.

  • grayracer513

Posted May 11, 2009 - 12:31 PM


The heat spot on the crank is the result of the manufacturing process, and is normal. A replacement crank should cost around $400 or less. If you do the work yourself, you can figure to spend under $700 if that's all you do.

Naturally, it requires a complete tear down.

  • bchopin19

Posted May 11, 2009 - 02:55 PM


The guy said that the motor is off the bike and he tore it down, I think all it needs is rod bearings but not sure, Im really worried about fixing it and spending alot of money and me not be able to start it. I just have an xr400 and im sure that bike is nothing like an xr400.

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  • grayracer513

Posted May 11, 2009 - 03:27 PM


By the time you buy the rod bearing and have it installed in the crank, you will only be a few dollars short of replacing the whole crank.

And yes, the YZ400 is very different from an XR. It's like comparing a Trophy Truck to a Land Rover.

  • bchopin19

Posted May 12, 2009 - 02:40 AM


how reliable are the yz400's?

  • grayracer513

Posted May 12, 2009 - 05:23 AM


They are like driveways or sundials. They are a high performance bike, and require a bit more maintenance than an XR, but they are quite extraordinarily reliable.

  • bchopin19

Posted May 12, 2009 - 10:37 AM


someone told me that they had a yz400f and it was a 4 speed but I looked at the specs and it says that they are all 5 speeds, are they 4 or 5 speeds?

  • grayracer513

Posted May 12, 2009 - 10:51 AM


The 400's and 426's were all 5 speeds. The Gen1 YZ450 ('03-'05) was a 4 speed. Rarely, and mostly on factory bikes, the trans was modified to be a 4 speed to save weight, but the odds are much better that the bike either has a broken trans, or the guy just can't count to 5.

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