Grenaded GasGas 2 Stroke

edot504_
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IMG 0409 0.jpeg?VersionId=9UoFiTDZkoqr3hZVeRD1 Just grenaded my GasGas 250 2 Stroke, blew a hole in the head, the pin for the connecting rod was in my exhaust as long as a bunch of chunks of metal, cracked my case too. 
 

 

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RABnasty
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11/28/2023 5:32pm

What year, CC, hours and fuel type? Just curious. Sorry to see! 

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11/28/2023 5:36pm

Sorry man. Tell us more as asked above. There has been a couple Katos with pix like floating around the last few years. 

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langhammx
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11/28/2023 5:36pm

Need more info, but that’s an expensive fix for sure

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The Shop

CBE
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11/28/2023 5:38pm

There was a recall for a different CDI in 2023 bike last I believe.

edot504_
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11/28/2023 5:41pm
RABnasty wrote:

What year, CC, hours and fuel type? Just curious. Sorry to see! 

2022, 250, 100 hours on frame maybe 20 on top end, and we run 91 pump gas with Motorex 32:1. Everything in the bike is fully stock

crmx105
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11/28/2023 5:49pm

Piston intake skirt may have hit crank? Was new piston OEM Vertex?

edot504_
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11/28/2023 5:51pm
crmx105 wrote:

Piston intake skirt may have hit crank? Was new piston OEM Vertex?

Everything OEM

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FlickitFlat
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11/28/2023 6:00pm

I've never seen a 2 stroke do anything, even remotely close to looking like that.  My expert opinion is that you had a mud dauber nest in the exhaust and you tried drift starting it by jumping it off your house.   How else could that happen? That is crazy. 

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edot504_
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11/28/2023 6:02pm
I've never seen a 2 stroke do anything, even remotely close to looking like that.  My expert opinion is that you had a mud dauber nest...

I've never seen a 2 stroke do anything, even remotely close to looking like that.  My expert opinion is that you had a mud dauber nest in the exhaust and you tried drift starting it by jumping it off your house.   How else could that happen? That is crazy. 

It was scary hahaha, happened in the air right when I went to rev it before I hit the ground, it made the gnarliest sound ever, sounded like every bolt in my bike just exploded out

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crmx105
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11/28/2023 6:03pm

If there is any intake skirt left measure the thickness of it versus the original piston. Vertex had a quality control issue with some pistons. It was talked about in the 300SX thread. The inside of the skirt can hit the crank. Maybe the 250 as well?

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FGR01
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11/28/2023 6:13pm
crmx105 wrote:
If there is any intake skirt left measure the thickness of it versus the original piston. Vertex had a quality control issue with some pistons. It...

If there is any intake skirt left measure the thickness of it versus the original piston. Vertex had a quality control issue with some pistons. It was talked about in the 300SX thread. The inside of the skirt can hit the crank. Maybe the 250 as well?

This is a carb bike, not a TBI bike.   There is no known issue with piston to crank contact on the carb bikes.  Also when the piston does contact the crank it does not usually present in this manner (head blown off).    My initial guess is this is more likely a rod failure.

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burn1986
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11/28/2023 6:16pm

Omg, that sucker blew! I’ve never seen a failure like that on a 2-stroke. Shoot Sad

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edot504_
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11/28/2023 6:18pm

What does the top of the piston and bottom of the head look like?

We haven’t taken it fully apart yet when we do I’ll post more pics

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Magoofan
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11/28/2023 6:22pm

I know it sucks and all.....but part of me thinks that looks pretty sweet.    The blown piece will always look cool on a workbench.  I've got bent valves from a small block 350 build as trophies. Smile

Could be tied to manufacturing defect....  I heard from my dealer (Triumph) that a lot of the manufacturers have been having quality issues since the Great Flu shutdown.

 

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11/28/2023 6:24pm

What does the top of the piston and bottom of the head look like?

edot504_ wrote:

We haven’t taken it fully apart yet when we do I’ll post more pics

If something got between the top of the piston and bottom of the head, there would be visible damage to both, with it still assembled.

dadofagun
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11/28/2023 6:24pm

What does the top of the piston and bottom of the head look like?

edot504_ wrote:

We haven’t taken it fully apart yet when we do I’ll post more pics

Gonna assume you are ok?  Let the bike go to hell....it's fixable.  Hoping you are alright.

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edot504_
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11/28/2023 6:26pm

What does the top of the piston and bottom of the head look like?

edot504_ wrote:

We haven’t taken it fully apart yet when we do I’ll post more pics

If something got between the top of the piston and bottom of the head, there would be visible damage to both, with it still assembled.

image 70.jpg?VersionId=m8XPtVoT2uGqo8L4ZRhqNWv6Mgm39j

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edot504_
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11/28/2023 6:26pm
edot504_ wrote:

We haven’t taken it fully apart yet when we do I’ll post more pics

If something got between the top of the piston and bottom of the head, there would be visible damage to both, with it still assembled.

edot504_ wrote:

image 70.jpg?VersionId=m8XPtVoT2uGqo8L4ZRhqNWv6Mgm39j

image 71.jpg?VersionId=REpielM8X1a4 tARD

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11/28/2023 6:34pm

If something got between the top of the piston and bottom of the head, there would be visible damage to both, with it still assembled.

edot504_ wrote:

image 70.jpg?VersionId=m8XPtVoT2uGqo8L4ZRhqNWv6Mgm39j

edot504_ wrote:

image 71.jpg?VersionId=REpielM8X1a4 tARD

From the cracks around the head, it looks like the top of the piston collided with the bottom of the head around the squish band, it's likely the bottom end or con rod failed.

image-20231129133251-1

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langhammx
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11/28/2023 6:42pm
From the cracks around the head, it looks like the top of the piston collided with the bottom of the head around the squish band, it's...

From the cracks around the head, it looks like the top of the piston collided with the bottom of the head around the squish band, it's likely the bottom end or con rod failed.

image-20231129133251-1

Yup, that is a crank or rod letting go. 

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langhammx
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11/28/2023 6:44pm

The good/bad news is that there’s a couple guys parting out brand new bikes and even at the proud price they are asking, it’ll be cheaper and way less of a headache to rebuild yours. 

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edot504_
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11/28/2023 6:48pm
langhammx wrote:
The good/bad news is that there’s a couple guys parting out brand new bikes and even at the proud price they are asking, it’ll be cheaper...

The good/bad news is that there’s a couple guys parting out brand new bikes and even at the proud price they are asking, it’ll be cheaper and way less of a headache to rebuild yours. 

Yeah we’re just going to find a way to buy a crate engine, if we can find somewhere to buy it from haha

FGR01
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11/28/2023 6:49pm

Also perfect opportunity to drop a 300 kit on it since you need all those parts anyway.

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edot504_
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11/28/2023 6:50pm
FGR01 wrote:

Also perfect opportunity to drop a 300 kit on it since you need all those parts anyway.

We have a 300 kit in my practice bike, the problem is I cracked my case and the bottom end is done, so we need a complete new everything 

lumpy790
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11/28/2023 6:52pm

How many base gaskets are you running to get the proper squish clearance when you replaced the top end? Clearance Looks pretty tight

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burn1986
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11/28/2023 6:52pm Edited Date/Time 11/29/2023 9:45am
crmx105 wrote:

Piston intake skirt may have hit crank? Was new piston OEM Vertex?

If the wrist pin bearing and stuff was in the exhaust, it might’ve been the circlip that came off, but the piston and head should’ve been scratched up. The head shouldn’t have broke under any circumstance. I’ve locked up soooo many two strokes and have never seen a head do that. When you rebuild, I would suggest an aftermarket head like vhm.

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langhammx
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11/28/2023 6:53pm
edot504_ wrote:

Yeah we’re just going to find a way to buy a crate engine, if we can find somewhere to buy it from haha

These are brand new bikes, taken apart and sold as parts, I’ll try and find a link to his eBay page, but he posts on here as well. 
 

Mav ~ help me out here… he’s posted on the for sale section several times. 

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uncledaddy69
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11/28/2023 6:53pm

That’s insane. I’m assuming from the fact that you are posting that you are relatively uninjured? Glad you’re ok. 

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