Repair skill level- yz case replace.


5 replies to this topic
  • tnl

Posted November 24, 2007 - 12:24 PM

#1

Searched but couldn't find a thread about this? I want to know how hard it is to replace the case on a yz and replace the yz tranny to a wr tranny? I've found the threads on the tranny switch regarding compatibility issues but nothing on the procedure and difficulty level? Maybe a numeric value like 1 to 5, 5 being toughest? Since I'm asking about it I hope it's not above my head? I've completed some routine maintenance on my bike like valve adjustment inspections, swing arm service, steering head bearing service, flywheel weight additions, replaced timing chain, carb/jet mods, a head light /stator addition and just recently removed the motor from the bike but never messed with splitting a case. I didn't notice any recommendations on the current stickies in regards to required skill level? I know I'm not the only one who would like to do all the work on my bike with out getting in over my head.
Thanks!
Tim

  • grayracer513

Posted November 24, 2007 - 03:22 PM

#2

Automotive flat rate manuals (and probably by now, motorcycle FMM's, too) rate jobs by skill levels A-D. A true master mechanic is actually a step above the A level, in most cases, and someone who can do light maintenance jobs without immediate supervision is at the D level. Replacing the crank and/or transmission is probably considered an A job, but a good, intelligent, conscientious B mechanic should be able to do it. In plainer language, if you are reasonably skilled, can read and follow the instructions in the manual, and can improvise a little here and there, you can probably handle it.

The only special tool you will really need is a flywheel puller. You have to also promise not to get frustrated while you try to assemble the trans into place. Being a genius won't help, but being a 3 handed juggler would. Mostly, the trick is to pay attention to the details, and cut no corners.

Got a manual?

  • tnl

Posted November 24, 2007 - 04:48 PM

#3

I only have the owners manual (I have read it about 5 times so far), Yamaha's on line microfiche and a good father in law for (for back up) and oh yea, T.T and you I hope:.)

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  • grayracer513

Posted November 24, 2007 - 06:44 PM

#4

The Yamaha Owner's Service Manual is an excellent guide, and should get you through the whole thing.

If you're going to do the WR trans, review this:

http://www.thumperta...ad.php?t=315799

Then download a WR450 manual here:

http://www.yamaha-mo...ice/manuals.jsp

and print out the trans assembly pages, since you will have never taken one apart.

  • Birdy426

Posted November 24, 2007 - 07:04 PM

#5

Also, pay particular attention to where the washers and spacers go in the trans and behind the clutch. I have a cheap digital camera and take pics of EVERYTHING as it comes apart. The pics are autonumbered by the camera in the order they are taken, so I get kind of a sequential pictorial guide of disassembly. I have a PC in the garage (for connecting to the on line catalogues and listening to MP3s) with the monitor hanging on the wall above my work bench so I can look at the pics as I put things together as well.

Overall, this job can be done by most mechanics if they take their time and pay attention to the details and the book.

  • todds924

Posted November 24, 2007 - 07:59 PM

#6

Automotive flat rate manuals (and probably by now, motorcycle FMM's, too) rate jobs by skill levels A-D. A true master mechanic is actually a step above the A level, in most cases, and someone who can do light maintenance jobs without immediate supervision is at the D level. Replacing the crank and/or transmission is probably considered an A job, but a good, intelligent, conscientious B mechanic should be able to do it. In plainer language, if you are reasonably skilled, can read and follow the instructions in the manual, and can improvise a little here and there, you can probably handle it.

The only special tool you will really need is a flywheel puller. You have to also promise not to get frustrated while you try to assemble the trans into place. Being a genius won't help, but being a 3 handed juggler would. Mostly, the trick is to pay attention to the details, and cut no corners.

Got a manual?

Thats funny. It does take 3 hands to slide all that stuff together and i always wonder why yamaha is the only one to "stake" the shift forks on the shafts???





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