exploded yfz450 motor

k-town quad boy #5 · December 12, 2007, 02:43:25 AM

this is what happens when your 04 yfz450 motors piston rod gives out! ANIALATION

trey82 · December 12, 2007, 02:53:18 AM

Ahhh, little duct tape and you'll be fine.

MOTOCROSS MAVERICK · December 12, 2007, 02:58:21 AM

ouch that hurts!!!!!

k-town quad boy #5 · December 12, 2007, 02:59:49 AM

haha i wish it was that easy kuz id do it!

k-town quad boy #5 · December 12, 2007, 03:00:53 AM

and my crank in my 06 locked up the weekend before.

novadave · December 12, 2007, 03:03:21 AM

Some JB weld might do the trick.

K-Town Quad Boy 08 · December 12, 2007, 03:12:22 AM

there is a simple solution......
GET A HONDA!!

novadave · December 12, 2007, 03:13:51 AM

I have seen trx450r the same way.

K-Town Quad Boy 08 · December 12, 2007, 03:15:06 AM

I know
i ljust like to mess with him bout it
cuz he is always givin me crap bout havin a honda

k-town quad boy #5 · December 12, 2007, 03:27:56 AM

Quote from: K-Town Quad Boy 08 on December 12, 2007, 03:12:22 AM
there is a simple solution......
GET A HONDA!!

only if it was givin to me!

trey82 · December 12, 2007, 03:30:49 AM

Quote from: k-town quad boy #5 on December 12, 2007, 03:27:56 AM
Quote from: K-Town Quad Boy 08 on December 12, 2007, 03:12:22 AM
there is a simple solution......
GET A HONDA!!
only if it was givin to me!

So thats how you got the two in your signiture?

k-town quad boy #5 · December 12, 2007, 03:35:52 AM

Quote from: trey82 on December 12, 2007, 03:30:49 AM
Quote from: k-town quad boy #5 on December 12, 2007, 03:27:56 AM
Quote from: K-Town Quad Boy 08 on December 12, 2007, 03:12:22 AM
there is a simple solution......
GET A HONDA!!
only if it was givin to me!

So thats how you got the two in your signiture?

haha no but i dont like honda for racing mx but htey are good bikes other wise

lugnuts · December 12, 2007, 03:40:27 AM

boy I have seen alot of these in the yfz's its from lack of oil getting to the wrist pin do your self a favor when you go back together get the 07 side cover with the 07 oil pump and nozzle aka:the oil mod if you dont you will be doing this again

steve

p.s I have a couple set's of yfz engine cases at my shop that belong to a friend that may want to part with them

k-town quad boy #5 · December 12, 2007, 03:58:44 AM

Quote from: lugnuts on December 12, 2007, 03:40:27 AM
boy I have seen alot of these in the yfz's its from lack of oil getting to the wrist pin do your self a favor when you go back together get the 07 side cover with the 07 oil pump and nozzle aka:the oil mod if you dont you will be doing this again

steve

p.s I have a couple set's of yfz engine cases at my shop that belong to a friend that may want to part with them

yea this one did have the oil mod. we were probably going to ge tthe whole 07 case but if you wouldnt mind finding out how much he would want and what years they are?

novadave · December 12, 2007, 05:09:53 AM

http://cgi.ebay.com/ebaymotors/OIL-UPGRADE-KIT-OIL-MOD-KIT-YAMAHA-YFZ450-YFZ-450-07_W0QQcmdZViewItemQQcategoryZ43977QQihZ019QQitemZ290188368082QQrdZ1QQsspagenameZWDVW

686RAPTOR · December 12, 2007, 06:44:44 AM

just pour some tussim on it.

lugnuts · December 12, 2007, 12:34:56 PM

I know there 06 cases I will call him and ask him to se how much $$

Mrs.Nightbreed · December 12, 2007, 08:33:35 PM

I have seen it happen on 07's too.....

There is a way to keep it from happening again. We have some YFZ's that were built in June and July of 2005 that are still running today.

kawasakimojaverider · December 13, 2007, 03:00:49 AM

WELL THERES YOUR PROBLEM

53yfz450 · December 13, 2007, 03:54:48 AM

damn wristpins... get an 07 oil mod the older styles that people did themselves didnt work 2 well. i know from experiance

k-town quad boy #5 · December 14, 2007, 02:13:15 AM

Quote from: Mrs.Nightbreed on December 12, 2007, 08:33:35 PM
I have seen it happen on 07's too.....

There is a way to keep it from happening again. We have some YFZ's that were built in June and July of 2005 that are still running today.

yea you guys are the ones that did the oil mod to this one still doesnt protect it 100% ntohing does.

trey82 · December 14, 2007, 02:15:28 AM

Quote from: k-town quad boy #5 on December 14, 2007, 02:13:15 AM
Quote from: Mrs.Nightbreed on December 12, 2007, 08:33:35 PM
I have seen it happen on 07's too.....

There is a way to keep it from happening again. We have some YFZ's that were built in June and July of 2005 that are still running today.
yea you guys are the ones that did the oil mod to this one still doesnt protect it 100% ntohing does.

Mrs.Nightbreed · December 14, 2007, 02:16:30 AM

It isn't just about the oil mod...it is about the rod.

k-town quad boy #5 · December 14, 2007, 02:26:53 AM

Quote from: Mrs.Nightbreed on December 14, 2007, 02:16:30 AM
It isn't just about the oil mod...it is about the rod.

what about the rod?

A.T.P. RACING · December 14, 2007, 03:03:11 AM

There are very few ways to keep a Yamaha engine together. Every YFZ engine that I have seen that has blown up has either only had some type of high compression piston and head work done, or has been completely stock and broken any way. Another major problem is the ignition timing, and when people add an aftermarket non programmable CDI box to the mix, either a piston pin, pin boss, connecting rod or rod bearing will fail.

We have worked with a few very well known aftermarket companies on what was causing the failures they were having with their YFZ engine kits.

We have a few yamahas running around the country that have had a couple of years on them with nothing but a re ring. These results have shown us that these engines need A LOT more bottom end work than they are getting.

The biggest problem is most people can't afford or flat out won't spend the money to put the proper parts and machine work in the engine to keep this from happening. As well, when you build a race engine even more so with the YFZ's you have to do a lot more costly maitenence to keep them tip top.

Mike
ATP Racing