Ouch

[castrolsniffer]

[declan]

@castrolsniffer

[castrolsniffer]

Just taken this outta my nephews dtr all that sharp metal is the rollers themselves all smeared into each other.
I think it was grit sucked in from a badly sealed air filter as the piston has little scratches on the intake skirt but I do know the bike wasn't run in by the previous owner and only had 400 miles on a fresh full rebuild
Any thoughts?

[declan]

@castrolsniffer perhaps when it was rebuilt the crank was neglected and needed changing?

[castrolsniffer]

No was brand new crank,I know the previous owner and where he had it done
He didn't buy cheap either,everything was mitaka,genuine gaskets and seals,oil pump checked and adjusted £££££ 400 miles bang,big end bearing failure but not 100% sure why

[declan]

Not that I know much but looks heat related to me like something caused friction?

[Calum]

Yeah that's a lack of oil that is bud.

[castrolsniffer]

I thought that too but the piston is fine so not 100%convinced,I thought the piston would suffer first as it's hot and the crank splashes thru a little puddle of oil in the crank cases.
That's why I'm asking tho guys,any input welcomed

[Calum]

@castrolsniffer Nah check the oil galleries in the crank case bud.

Yhr connecting rod will have oil galleries as well. It clearly hasn't gotten to the big end.