250r cool head ???????

[buck21]

so what I want to know is.... whats the diff. between 18 ,19, 21, domes , how does it cool better , What makes it better . what would be best for me and any info you wise teachers can give me :confused:

[rockman]

Originally posted by buck21
so what I want to know is.... whats the diff. between 18 ,19, 21, domes , how does it cool better , What makes it better . what would be best for me and any info you wise teachers can give me :confused:
What the numbers mean is the actual SIZE of the combustion chamber. 18cc, 19cc, etc. So it does not actual affect the cooling, it affects the compression ratio. HOWEVER, the cool head itself is much more efficient, thus it cools much better than stock. but again, the difference in the domes is compression ratio, not cooling efficiency.

[buck21]

ok cool its preety much what I was thinking so what size do i use for a stock bore .. I think Im still runnin stock anyway Id like to stay with normal octanes too
thats for the replys guys