Dan Williams Posted Today, 09:59 PM
I'll bet you were going like a bat outta hell when it failed.
Is there any other way to ride a 250 Ninja?
Don't red line until 14,000rpms.
It may not have been the heat range that caused the failure, but I did some research (online of course, so may not be 100% accurate).
Found out I was not the only person to have this issue.
I have a Temp gauge on the bike, when it holed the valve I looked down and it was in the red. Only rode about 10 miles when this happened, which is consistent with what I discovered during research after the fact.
Had proper coolant level in it. problem was solved with NGK plugs. (oh and a hefty repair bill for valves and valve lapping)
Any ways learned a lesson, only use NGK in my bikes.
And yep was very lucky that the piece of valve that came off went out the exhaust and did not stick or score the piston and cylinder. Very very lucky.
Edited by ZIPPY, 13 July 2008 - 02:36 AM.