Broke down on Sunday at ride, explenation

[unhingedlizard]

Ripped to block Apart this morning, pistons and rings are &*^(ed. The piston have a huge chunk missing from the front. The Bore and cylinder head were not touched!!! as in prestine. am I the luckyest bugger here or what!

[bugjuice]

bloody lucky!!!
guess that might be a reason it wasn't going too well then..??

[ManDownUnder]

bllody lucky!!!
guess that might be a reason it wasn't going too well then..??

Oh BJ - you're good at this I can tell... :rofl:

(Actually fair call... I just wanted to jump on the chance for a piss take... I like carrying piss...)

[ManDownUnder]

Ripped to block Apart this morning, pistons and rings are &*^(ed. The piston have a huge chunk missing from the front. The Bore and cylinder head were not touched!!! as in prestine. am I the luckyest bugger here or what!

What caused the chunk to fall of (i.e. was it impacted and beaten off, or melted?)

MDU

[F5 Dave]

The dreaded detonation.

What gas do you use & where you fill up is suspect supply. My RZ was reliable as despite the increased compression etc. Then they changed the petrol (from super leaded, ok it was some time ago huh) & the first long ride I went on chasing some bigger bikes, it Chernobyl’d.

Other option is leaking head gasket.
Check out this guide (http://www.eric-gorr.com/twostktech/pistondiaguide_2t.html)

[unhingedlizard]

I usually fill it with 91, that day i filled it with 96 in Hamilton and 91 in Auckland.

MMMM, might run 96 from now on. Replacing the headgasket as well, it is fine but replacing all gaskets anyhow.


42,000km might have something to do with it to......

[F5 Dave]

42,000km might have something to do with it to......


Not really. Piston skirts tend to crack with excessive wear.
Yes 96 would be wise.

Just be double sure that there is no ally left on the bore. Can take it off with caustic soda if you are careful.