My brother blew up my motor

AURORA · Post by **AURORA** » March 2nd, 2013, 8:32 pm

Post by **MojoScojo** » March 2nd, 2013, 9:23 pm

Wow. The carnage.
I'm sorry for your loss.

AURORA · Post by **AURORA** » March 2nd, 2013, 10:02 pm

The original piston and rings.

Now I don't know WTF to do.

Donor bike?

Buy new cases?

Is the crank and rod bad? bearing bad?

I never split the cases on a 2 stroke. Maybe have someone else with more experience deal with the project.

Who to send it to? Roosty? Eric Gorr?

Right now I'm just bummed out.

Gravel Scratcher · Post by **Gravel Scratcher** » March 2nd, 2013, 10:15 pm

I'll go for piston failure, if its still on the original. Yeah with that much shrapnel I'd be splitting the cases to flush and check everything out. Rebuild using the info in the stickies if your just going stock and trying to control the dollars.

Tharrell · Post by **Tharrell** » March 3rd, 2013, 4:47 am

Wow. That's hard to look at.
Don't put all the blame on your bro, could have just been overtime for a topend.
You know those pistons will develop cracks if not replaced in time.
A skirt breaks off and gets banged around the bottom.
An overdue topend coupled with someone riding it like a 125 is a recipe for pretty much what you have there.
I'm guilty of it myself.
Look at it this way, you're going to have a new engine soon and you KNOW what's in it.
Splitting the cases is a breeze if you follow directions.
There's plenty of help from us, just ask.

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » March 3rd, 2013, 5:30 am

pro-x or vertex piston? don't look stock with a taper in the wrist pin.
either way, i can fix it, I can save the cases if its not broke a threaded bolt hole area away.

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » March 3rd, 2013, 5:46 am

I'll quote your post to make the pics work..

NightBiker07 · Post by **NightBiker07** » March 3rd, 2013, 9:29 pm

That ws deinitely caused by a long-overdue top end rebuild. I dont think bad jetting would cause that.

BUT, unless I missed a picture, only one case half is bad?

With that carnage, you best replace the crank, or have yours rebuilt with a fresh rod kit.

Post by **MojoScojo** » March 4th, 2013, 6:28 am

NightBiker07 wrote: BUT, unless I missed a picture, only one case half is bad?

Which one of these is bad?

Kuma · Post by **Kuma** » March 4th, 2013, 12:33 pm

I think the only question is, which part of the piston let go first?

gregrobo · Post by **gregrobo** » March 4th, 2013, 6:07 pm

im with roosty i have repaired cases that were broken out worse that that

Rhino89523 · Post by **Rhino89523** » March 4th, 2013, 8:04 pm

What causes a piston to fail like that?

black · Post by **black** » March 5th, 2013, 4:24 am

I have never seen a 2 stroke piston come apart that bad, no damage on the top, it just plain broke apart. It must have been worn and cracked to shit, did you not hear any noise/signs from the piston?

Tharrell · Post by **Tharrell** » March 5th, 2013, 4:51 am

I was hoping they were BOTH bad:)

MojoScojo wrote:
NightBiker07 wrote: BUT, unless I missed a picture, only one case half is bad?
Which one of these is bad?

AURORA · Post by **AURORA** » March 6th, 2013, 5:37 pm

[quote="black"]I have never seen a 2 stroke piston come apart that bad, no damage on the top, it just plain broke apart. It must have been worn and cracked to shit, did you not hear any noise/signs from the piston?[/quote]

My brother was the one riding it when it exploded. One time I thought I heard piston slap but it didn't hear it after that one incident?

This is my first smoker.

I am surprised the right case can be fixed. The left case has a small hair line crack that can be fixed?

What would you have to do to fix the right case? Weld in a new section?

Looking at previous posts that I have read issues on Hotrod cranks, they had issues difference size ends. My crank still spins freely. What damage to the rod and crank is not known until disassembly.

Is it cost affective to buy a Hotrod crank? Honda crank or have mine repaired and balanced?

Gmbond · Post by **Gmbond** » March 6th, 2013, 7:40 pm

Roosty has shown some magic repairs on some seriously messed up cases

You used the term "four stroking it"

Do you mean low rpm lugging of the motor which is/was the classic "four stroking" riding technique. Or the new moron way of bouncing it constantly off the rev limiter especially anytime it's in the air?

The 500s LOVE to be lugged and torqued around....

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » March 7th, 2013, 7:40 am

https://skydrive.live.com/?cid=bd4aa268 ... =documents

AURORA · Post by **AURORA** » March 11th, 2013, 3:55 pm

[quote="Gmbond"]Roosty has shown some magic repairs on some seriously messed up cases

You used the term "four stroking it"

Do you mean low rpm lugging of the motor which is/was the classic "four stroking" riding technique. Or the new moron way of bouncing it constantly off the rev limiter especially anytime it's in the air?

The 500s LOVE to be lugged and torqued around....[/quote]

He was short shifting not really hitting the pipe.

AURORA · Post by **AURORA** » March 11th, 2013, 4:01 pm

Roosty,

Are you near Kenora?

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » March 12th, 2013, 10:19 am

not really, wheel out from here

https://maps.google.ca/?ll=49.191747,-9 ... 4&t=h&z=19

500R1991 · Post by **500R1991** » March 13th, 2013, 6:14 pm

Looks like all five jugs are good

BannedCR500Riders.com

My brother blew up my motor

My brother blew up my motor

Re: My brother blew up my motor