engine blew up


8 replies to this topic
  • jevc

Posted October 07, 2005 - 06:54 AM

#1

Yesterday it happend. I blew a hole in the cranck case. inside looks like a mess. any body know where I can get an engine for a 2002 wr 426? The rest of the bike is in good shape with a ton of mods. I got too much into it to just part it out and it has a Ca street tag. Any Ideas. there is shrapnel laying all over the road to my house.

  • BMRSNR

Posted October 07, 2005 - 10:24 AM

#2

That sucks man. I can't help help you but let us know what you find and where.

  • old man dan

Posted October 07, 2005 - 11:04 AM

#3

Get a hold of this guy and see what you can work out.



Join Date: Aug 2001
Location: California
Posts: 1,555



Real Differences tween 2001 YZ and WR ?

I have a 2001 WR426F that has been in supermoto trim since the day I bought it new in late 2000, it has been a wonderful machine.
3 years ago I did a 444 big bore kit to it, had the head cleaned up and ported slightly and it was a definite improvement.
Like all of the after market pistons this Weisco started to rattle around in the bore after a few thousand miles, and I am sure the rod is a little long in the tooth.
Long story short, I was debating rebuilding this WR motor from the ground up when I came across a brand new YZ426 motor in a crate complete with carb, so I bought it, but now I am having second thoughts.

My question(s),
How much different is the YZ gearing than the WR (same year engine)?
Were there any other differences in the 2 engines besides cam timing and throttle stop?

I will need to keep the lighting coil because my bike is street legal so I have lights and signals, do I just swap the lighting coil from the WR motor over to the YZ motor? is there anything else I need to do electrically to do that right?

Also I read allot about counter balancer woodruff keys back in the day, I can say however that my WR motor never had an issue with that, so is there a hardened (harder than stock) woodruff key that I should consider replacing before I put the motor in the bike?

I guess my main fear is that with the YZ gearing I may not like it as much on the street, so I need some input on that from those of you with experience.
I have not committed to anything yet other than the fact that I have a brand new YZ engine in a crate with Japanese writing all over it sitting in my garage, I will not be putting the big bore kit on either of these 2 engines this time around as I really don't think the reliability is there with after market pistons and the extra bottom end that I got out of it was really not worth the piston slap noises I had to put up with after about 6 months of weekend riding.

So the bottom line is this, if you had the choices I have now of (1) installing a brand new engine including swapping the ported head from the old engine, swapping the lighting coil from the old engine and calling it a day or (2) rebuilding the old engine which I am sure will require all new lower end bearings, a few gears, shift forks, clutch basket and clutch, crank work most likely (Falicon), with a knife edge rod etc.

I am certain I can sell this crated engine to a kart guy on ebay and not lose a dime, I paid $1400.00 for it.

I guess the other thing I could do is sell the old engine on ebay for close to a grand and end up paying $400.00 for a brand new engine which would not be all that bad.

Thoughts? suggestions?
Thanks.
__________________

http://www.teamscream.tv

  • Gadsen

Posted October 07, 2005 - 11:07 AM

#4

4 strokes are spendy when they "pop", but real spendy when they "ventilate"

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  • Bamster

Posted October 08, 2005 - 06:04 AM

#5

This will fit right in
http://cgi.ebay.com/...1QQcmdZViewItem

  • biggiesyup42

Posted October 08, 2005 - 10:29 AM

#6

Can you make a engine from a 2005 Yamaha YZ450F work?

  • jevc

Posted October 10, 2005 - 10:27 AM

#7

Does anyone know if a 450 engine will fit in the 426. I would like to stay with a wr engine as all my riding is wide open desert and I need the fifth gear. I am going to start tearing it down today to see how bad things are but I am not thinking it is going to be pretty.

  • RottenRich

Posted October 11, 2005 - 12:29 AM

#8

Does anyone know if a 450 engine will fit in the 426. I would like to stay with a wr engine as all my riding is wide open desert and I need the fifth gear. I am going to start tearing it down today to see how bad things are but I am not thinking it is going to be pretty.


l've just fitted a 450 engine into my wr400, there's a few mods you have to do but not to much. l'll post em up when l get time if you want to know.

  • goodluckmonkey

Posted October 11, 2005 - 03:54 AM

#9

TeamScream on here has got a crated YZ426 motor that he's not using apparently. :banghead:




 
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