4 Stroke Top End Rebuild

This weekend I rebuilt a 2013 Kawasaki KX250f, One of the bros had been thrashing it down the beach and it stopped running. Turns out that tight valve had gone soft being titanium and cause the bike to lose all compression. After dropping a large amount of shim thickness on that one valve and still having zero clearance, I realized what had happened and told the owner the valve is toast. The owner has ordered some stainless valves for me to replace them with which I will do off camera. let me know if the video was something you enjoyed and you want me to share more odd jobs like this one.
Next video will be back to V twin content as my laser cut spacers and O rings are here.
I am also chipping away at the 2 stroke V4 in the background although racing the V twin is the main priority at the moment.

[@hershelshochter4703]

do you hone your cylinders if you put in new rings/pistons?

[@OddsandEndsMachining]

Not Nikasil, just scotch off any loose aluminium and re install. The homing marks were still visible in this motor.

[@298CRE8]

Did you check for any leakage or quick grind on valves etc to help re seal? Should invest in an ultrasonic cleaner helps with engine strips and dip cleans etc
With regards to any wear on cams did you measure it come out at much or just looked scuffed?

[@OddsandEndsMachining]

It just ended up looking scuffed and measured within spec, you couldn't pick it up at all with a fingernail or feel it.
An ultrasonic cleaner would be top notch.
The valves shouldn't be lapped as they're titanium and that drastically shortens their life. I will be replacing them with stainless steel valves and lapping them.