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Discussion Starter · #1 ·
I type this from the trail side.... Mag side piston failed (unknown reason at this time) something got on top of the piston and smashed spark plug. Might tear it down tonight to diagnose what happened.

Sent from somewhere in MN
 

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Discussion Starter · #3 ·
Yeah it sucks. I'm home now, probably gonna take the head off tonight and assess the damage.

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Discussion Starter · #6 ·
Top ring turned and caught exhaust port. Bottom ring was on its way around too.....

Motors gonna get pulled, cases split, cleaned out, bearings replaced, seals replaced, both pistons, 1 jug and a head

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Discussion Starter · #7 ·








Sent from somewhere in MN
 

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This is how I felt after 3 miles into the season
 

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Discussion Starter · #9 ·
I bet. Didn't you rebuild it and it went down again or no?


Also what causes the ring locating pins to sink into the piston?

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I rebuilt, Now I have stator Problems

For Locator Pins, I have No idea. Did they sink or fall out allowing the Ring to twist
 

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Discussion Starter · #11 ·
Good thing this happened when it did..... Other piston was starting to fail too..... Intake side piston skirt is cracked

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Discussion Starter · #12 ·
I rebuilt, Now I have stator Problems

For Locator Pins, I have No idea. Did they sink or fall out allowing the Ring to twist
Top one sank bottom one broke

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I bet. Didn't you rebuild it and it went down again or no?


Also what causes the ring locating pins to sink into the piston?

Sent from somewhere in MN
Snagged a ring, I called it! LOL

I just went through this with my Tcat. High mileage causes this. The pin either breaks off or gets pushed into the piston allowing the ring to move.

Mine happened last season and I probably put 400 or so miles on it as the motor still ran and had 100 psi in that hole. I put one new Cat piston, jug, head and rings on the motor to get through the rest of the season, I have 2 other new Cat pistons that will be going in this summer.

 

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Discussion Starter · #14 ·
So how do they get pushed in though? Isn't it solid aluminum behind them?

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The pin doesn't bottom out in the piston, over time the vibration loosens it up and the ring pushes it in. Some pistons you can see the hole from the inside. The ring itself can also wear down the top of the pin over time. Either way this is a lesson learned, change your pistons every 3500 miles.
 

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Discussion Starter · #17 ·
From looking at my broken piston it looks like i have a nice coffee color on the top lol. Jetting is spot on! Cat happy
Coffee color? That's a new one. although my other spark plug(pto side) looks about that color
 

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Discussion Starter · #18 ·

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