426 maybe blown up?! Help!



6 replies to this topic
  • 426 dude

Posted August 13, 2014 - 09:44 AM

#1

Was out riding with some buddy's today and out of nowhere my 2001 yamaha 426f started to stutter then died,the kickstart was locked and wouldn't move even with the decompression lever pulled in,got it back to the shop,turned the crank 1 full turn to see if the top and bottom end was toast and it moved fine,once I turned the crank the kickstart was unlocked and it fired back up,gave it a bit of fuel and it died and was locked again,anyone know what's going on? Thanks in advance

  • gimped up

Posted August 13, 2014 - 10:02 AM

#2

Pull it apart. Immediately.

  • jrice2012

Posted August 13, 2014 - 10:24 AM

#3

Was out riding with some buddy's today and out of nowhere my 2001 yamaha 426f started to stutter then died,the kickstart was locked and wouldn't move even with the decompression lever pulled in,got it back to the shop,turned the crank 1 full turn to see if the top and bottom end was toast and it moved fine,once I turned the crank the kickstart was unlocked and it fired back up,gave it a bit of fuel and it died and was locked again,anyone know what's going on? Thanks in advance



For future reference. If the Kickstart locks up after the engine dies, do not try to fire it up again. There's a reason it's locked up. All firing it up again will do is deal more damage internally. Break it down.

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  • dirt1080

Posted August 13, 2014 - 10:36 AM

#4

Just pray your valvetrain is in one piece

  • 426 dude

Posted August 13, 2014 - 10:38 AM

#5

I'm thinking maybe the crank bearing is gone

  • Yammer-Hammer

Posted August 15, 2014 - 10:57 AM

#6

Just pray your valvetrain is in one piece


Ummm, if he got it to restart then his valve train is fine, well atleast not grenaded.

  • grayracer513

Posted August 17, 2014 - 06:06 AM

#7

A worn rod bearing can jam solidly enough to seize the engine but release when rotated backward.  Then it may run "normally" for some period and do it again.







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