Shredder770 said:
Compression is all relative whether youre running a YZ, YFZ or anything else with high compression you need to compensate with octane above 12+:1. in my Turbo sleds it would detonate and ping all over the place(Not that I allowed this to happen) put in good full burn is much better.
Mike
Not necessarily Mike. a yz450 does not require race gas. it runs 12.3 now, and use to run 12.5. The yfz HAS to have race gas running those compression numbers.
yz250f's are high compression, above 12 and they dont require race gas.
my point is, you cant say, well my yfz can run 11.9.1 or 12.1 without racegas, so that means my 700 will be cool too. Where in reality, much more than the 10.75.1 and you HAVE to run race gas on the 700. This is why the 700 is stock with 9.2.1....it cant take much more. That is a big piston, and a lot of internally moving parts, with a lot of resistance and drag. Not to mention the weight of the machine.
The bigger the cylinder and piston, the lower the compression will have to be before running into HAVING to run high octane fuel.
I think we might be saying the same thing, just differently :3question: :thumbsup: