zxr250 conclusion.

[Frogger]

so my bike broke down the other week and i had to leave it on the side of the road to goto work. jimmyboy had stored it since then and i got it back the other day.

i lost my 10mm socket so couldnt get the head off at first so i took off the bottem case where i found 3 or 4 small chucks of metal abit smaller then a pea. i knew that ment something bad had happened. so today i got a new socket and pulled the head and here is wat i found.





this is the valves for the piston with the hole.


im not the most kwonledged but i was under the impression that when a piston has a hole in it its normaly from hitting a valve or something like that , but the head doesnt look like its been impacted.

the other 2 pistons have some wear on them and the 4th piston has no damage.

whats everyones thoughts on this. im not sure wats happened.

[silver12r]

ouch,was the engine rattly? could of fell out of time.
getting another bike? or fixing the ninja?

[Frogger]

yeah it was rattling, i have a spare engine here that im putting back together, fucken cams are giving me the shits though cant seem to get them to line up properly when i tighten the cage. if this engines no good ill either sell it off and buy a cheap car to get to work with or ill try save for a new engine from over east. but i cant save when transperth take all my money. $10 to get the train from rockingham to south perth. my old mazda 626 with over 400,000k on it used to get there and back for about $8. what a joke.


i was doing some research and found that if the engine is running lean on a hot day the spark can melt a hole in the piston or something. and the first thing i noticed when i got the bike back was traces of coolant around the water pump as if it had been leaking and the coolant was low.

[D.J]

valves look very lean and looks like detonation on the pistons that aren't holed. could be a big timing issue.