how too check for a bent crank rod yz426f


61 replies to this topic
  • bakeyz426f

Posted August 09, 2009 - 05:56 PM

#1

i have the top end and cyilinder off. i broke a valve and have pictures of the valves and cyilinder in another post on here but nobody has responded yet. its my first time tearing apart an engine so your help is greatly appreciated.

  • stevenacarter77

Posted August 09, 2009 - 07:18 PM

#2

well i see you have made 22 posts, you need to delete all but this one
1 do you have a manual for this bike?
2 as far as the crank and rod go i would have a bike shop inspect it; do you have it out of the case?

  • bakeyz426f

Posted August 09, 2009 - 08:07 PM

#3

no not yet

  • bakeyz426f

Posted August 09, 2009 - 08:11 PM

#4

my shop said i need about 2600 in parts does that sound right. i need a new head ,valves, cam assemnly i think , cam cainn, crank assembly, and piston and rings

  • stevenacarter77

Posted August 10, 2009 - 03:38 AM

#5

no that don't sound right, check prices here; http://www.servicehonda.com/index.html yes i am up

  • grayracer513

Posted August 10, 2009 - 08:30 AM

#6

The head is repairable. http://www.enginedynamics.com/

The crank has to be removed in order to correctly inspect the rod.

  • bakeyz426f

Posted August 10, 2009 - 02:13 PM

#7

if the rod is bent do i need an all new crank assembly

  • stevenacarter77

Posted August 10, 2009 - 02:20 PM

#8

that would probly be the best idea, that is how i would do it.

  • bakeyz426f

Posted August 10, 2009 - 02:25 PM

#9

how much would it cost to repair the head i found a new one for 750 bucks at mrcycles.com

  • grayracer513

Posted August 10, 2009 - 03:11 PM

#10

Contact Engine Dynamics and ask my guess is about half the cost of new.

Normally, by the time you pay for the labor of having the crank rebuilt, a new one is about the same cost or less.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • bakeyz426f

Posted August 10, 2009 - 03:21 PM

#11

i was planing on rebuildig the crank myself. if i send the head cyilinder to get fixed does the other cyilinder have to be bored out bigger then and get a bigger piston as well

  • grayracer513

Posted August 10, 2009 - 03:26 PM

#12

i was planing on rebuildig the crank myself.

So, you were either going to buy the fixtures for your 40 ton hydraulic press or make them? How do you intend to align the crank after you press it together?

  • bakeyz426f

Posted August 10, 2009 - 03:34 PM

#13

are you saying i need a 40 ton press to repair my crank. im not sure how to allign the crank how would you do it.

  • grayracer513

Posted August 10, 2009 - 03:45 PM

#14

Yes, that's what I'm saying. Crank alignment requires two dial gauges, and a ball bearing truing stand just to check it. Correcting misalignments is work for a skilled, experienced machinist only.

  • bakeyz426f

Posted August 10, 2009 - 04:04 PM

#15

have you done it before. i just got a crank splitter, and crank installer, your saying i would need those tools also to install a new crank asembly.

  • bakeyz426f

Posted August 10, 2009 - 04:37 PM

#16

if i get the dial gauges and stand it says you need in the manual would i be able to install a new crank then or do i just need this tool to repair a bad crank.

  • moto2000

Posted August 10, 2009 - 05:33 PM

#17

There's no sense in checking your old connecting rod.....by the time you're in there you might as well replace it....it probably needs it, by looking at the blow-by on your piston.

You shouldn't need any special tools to replace the crank assy. with a new one (your best choice).

Rebuilding the crank is a whole different story....you'll need a rod, bearing, pin, etc and bring it to someone who specializes in rebuilding and truing them.

  • bakeyz426f

Posted August 10, 2009 - 05:36 PM

#18

will i just need the crank assembley or will i need other parts in the crank.

  • moto2000

Posted August 10, 2009 - 05:56 PM

#19

http://oem.thumperta...shaftpiston.gif


#1 is the crank assembly.....it will come in one piece and true (assuming nobody dropped it)

you may want the two main bearings as well (#7)

  • bakeyz426f

Posted August 10, 2009 - 06:05 PM

#20

when i buy valves do i need all of the like 20 pad adjustings. also my head top reuseable possibly it would say some money.





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