2006 YFZ450?
Jan 4, 2005 | 01:46 PM
#11
Elite Pro Rider
Joined: Sep 2002
Posts: 9,380
Likes: 1
2006 YFZ450?
Well I have yet to "observe" any yfz with stock compression have any issues related to predetonation or lack of sufficient octane. We are about 500' above sea level here, so the same octane should perform better as altitude increases.
Jan 4, 2005 | 01:50 PM
#12
Pro Rider
Joined: Jun 2003
Posts: 521
Likes: 0
2006 YFZ450?
Originally posted by: D3athShad0w
*I like physical evidence not calculated estimation.
*Because of these variables is why lots of the time you find a new bike to be on the rich side from the manufacturer (to compensate for altitude & variables)
*Variables - temperature, compression ratio, bore & stroke, head volume, additives, deck height, ionization, etc...
*I like physical evidence not calculated estimation.
*Because of these variables is why lots of the time you find a new bike to be on the rich side from the manufacturer (to compensate for altitude & variables)
*Variables - temperature, compression ratio, bore & stroke, head volume, additives, deck height, ionization, etc...
Everyone would love to have physical evidence but it is physical evidence the leads to safer calculated estimation. Since you seem to have some pyhsical evidence, what would you recomend the minimum safe octane rating be for various compression ratios in general(assume stock ignition timing and throw all other variable out the window)?
Jan 4, 2005 | 03:48 PM
#17
Range Rover
Joined: Apr 2004
Posts: 197
Likes: 0
From: Sonora, CA
2006 YFZ450?
Yes minimun meaning not less than. If there would be problems with the engine at 91 octane I think Yamaha would put a higher minimum rating. I could be wrong they only desinged the eninge.
