Holy Piston
#11
Holy Piston
Thanks for the info, sixsixT ...
I guess it varies quite a bit on different makes/models. I know my bike they said to run 93 and it is 11.8:1 from the factory. They said the same thing about the 12.5:1 models as well.... fuel injection is a different animal though.
I follow the octane talk pretty closely as it is always a topic of interest to me. The misconceptions surrounding octane captivate my puny brain [img]i/expressions/face-icon-small-smile.gif[/img]
I guess it varies quite a bit on different makes/models. I know my bike they said to run 93 and it is 11.8:1 from the factory. They said the same thing about the 12.5:1 models as well.... fuel injection is a different animal though.
I follow the octane talk pretty closely as it is always a topic of interest to me. The misconceptions surrounding octane captivate my puny brain [img]i/expressions/face-icon-small-smile.gif[/img]
#13
Holy Piston
I know what you meen thomez I think it's the same fore the YFZ. I talked to a rep from 76 and for a liquid cooled engine and a 4" bore he said 100 was good up to 14:1. Part of the problem may have been the carb bowls running low also even tho the seats were drilled and I'm sure it was jetted a tad rich. Some have suggested the piston could have been deffective. That's another reason for posting pics, to get some other opinions. I may also send it to a manufacturer to get an opinion on what might of happened.
#14
Holy Piston
I've got one of those je pistons that cracked. It's caused by the top of the piston flexing. Did you measure the legth of the wrist pin? Mine was 9mm smaller than the new one. I've talked to je about this problem, they want to see the piston. Other guys had new pistons sent to them. How much time was on the piston? Mine had about 40hrs on it.
#16
#17
Holy Piston
how was the bike running before you took the piston out? my bike is pressurizing the oil ressy when I run it hard and then when it cools I notice the level drops and drops. I know I am burning oil. I hope it is my rings so I can get a few more rides in. if it is the piston and I keep riding it Murphy's Law says I am sure to get stranded out at China Wall or Lizard hill [img]i/expressions/face-icon-small-sad.gif[/img]
#19
#20