Author Topic: yz 250 engine seized, i think (Read 7896 times)

Stusmoke · « **Reply #15 on:** April 10, 2013, 09:46:38 AM »

Quote from: Jeram on April 10, 2013, 03:58:19 PM

Quote from: eprovenzano on April 08, 2013, 08:30:03 PM
Quote from: Jeram on April 08, 2013, 04:29:55 PM
Quote from: Stusmoke on April 08, 2013, 11:45:22 AM
Also, I've heard of people having siezure issues with the Wiseco crank. Use caution.

That defies logic doesn't it

Not really, many people have reported having issues with Wiseco cranks. The quality is not what you'd expect from Wiseco.

But how does a crank cause a seizure?

It would take alot of tiny smashed crank fragments to seize the motor ?

Not sure what the problems with them were just heard of peoples wiseco bottom ends seizing.

eprovenzano · « **Reply #16 on:** April 10, 2013, 01:00:26 PM »

The big end bearing on the crank goes and does all kinds of damage.

adzski · « **Reply #17 on:** April 10, 2013, 01:19:32 PM »

Update.

ok today i pulled the motor out.

reason why the swing arm and motor bolt wouldnt come out was, silly me forgot to loosen the suspension once i did that she came right out well with some persuasion hhaha.

im gonna make a build thread or whatever, but just rename this so if a moderator wants to move it to the selected category would be appreciated but anyway. ill puts some pics below

adzski · « **Reply #18 on:** April 10, 2013, 01:27:27 PM »

when i first started pulling the top end off!

quick pic of the piston

with the motor pulled out

_X_ · « **Reply #19 on:** April 10, 2013, 11:18:28 PM »

adzski · « **Reply #20 on:** April 11, 2013, 08:06:08 AM »

build thread link
http://twostrokemotocross.com/forum/project-yz/2002-yz250-top-and-bottom-rebuild-project/

TMKIWI · « **Reply #21 on:** April 11, 2013, 08:08:05 AM »

That looks nasty.
Make sure you find the reason for the damage before you ride again.

adzski · « **Reply #22 on:** April 11, 2013, 08:12:36 AM »

will do man, i do similiar sort of stuff for a living.

and yeh she defiantly needs some love

Stusmoke · « **Reply #23 on:** April 11, 2013, 12:24:51 PM »

That is the epitome of butt f**ked piston. You said you were doing a bottom end rebuild too right? If not, you'll probably want to end up splitting the cases anyway just to make certain the the crank is unharmed cos it looks like there must have been a fair wad of fragments come out of that piston.

As far as pistons are concerned? Wiseco or wossner, accept no substitute.

2T Institute · « **Reply #24 on:** April 11, 2013, 02:06:14 PM »

Looks like a classic case of to much piston to bore clearence.

moto867 · « **Reply #25 on:** April 12, 2013, 07:32:08 AM »

fo sho! deff left that piston in there too long. check the plating around the ex port. when the piston is that loose it really wears the plating quickly. and wiseco rods are the only aftermarket rods i never use. seen several break

adzski · « **Reply #26 on:** April 26, 2013, 02:02:12 PM »

had to get a new barrel, well the costs were similiar to get it re-sleeved to a new one so i went with a new one. also stilll waiting on the rebuild kit and the flywheel puller.

vetman · « **Reply #27 on:** April 26, 2013, 11:08:45 PM »

ouch sucks when this happens to anyone console yourself that you don't have to do valves cams etc

adzski · « **Reply #28 on:** April 28, 2013, 05:43:06 AM »

yeh best to look on the bright side hey hahaha

picked up the new barrel today still waiting on rebuild kit and flywheel puller from US

eprovenzano · « **Reply #29 on:** April 28, 2013, 01:23:29 PM »

I know it sucks, but look at the bright side, when you're done, you will know that you did the work, and that all is as it should be in your engine. Keep us informed as to the re-birth of the YZ.

Eric

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Author Topic: yz 250 engine seized, i think (Read 7896 times)