haste makes waste -- why you should double check your work...

[MotoCreations]

I received these pictures yesterday.  Owner recently pulled the heads and reinstalled as well as adjusting valves and putting on new timing belts.  He rode around without problems -- first major run down the freeway and something went boom in a rather big way.  These are the inspection pictures with the valve physically removed from within the top of the piston.  Not going to be a cheap repair -- more like parts replacement time.

Thus reminder for those who do their own work at home or whom are doing it for the first time -- double check your work and follow the instructions carefully.

Here are some good instructions via Chris / CA-Cycleworks (Adjust)  (Video's)

[VisceralReaction]

What would be cool and informative. Is there any way to tell what the owner did incorretly to cause this?

[kingmoochr]

my first guess would be loose belt. putting around just fine, but when the revs picked up event timing went to hell and valve formally introduced itself to piston.

[Spidey]

   Yowsa.  Big ole hole in that piston.     And that cylinder head looks all chewed up from stuff banging around in there.   

[Rameses]

That shit'll buff out.

[mossimo]

That shit'll buff out.

As long as you start with a rough grinding wheel

[kingmoochr]

needs a new seat and guide, but smooth it out with a sanding wheel and long as theres no nicks in the sealing band, itll be alright. piston, valve, guide and seat from what i can see in those pics