WR450 - Octane rating?

8 replies to this topic
  • OkieRider

Posted March 18, 2004 - 05:45 PM


While doing some research on the WR450 I read in the service manual that Yamaha recommends 95 octane gas. Has anyone used anything less? If so, was there any major problems - pinging, power loss etc.?

  • Indy_WR450

Posted March 18, 2004 - 05:50 PM


You can run as low as 87 at high altitude. Dont worry about it. I run 92/93 all the time without issues. :)

  • latehit

Posted March 18, 2004 - 05:51 PM


I believe that is the Research Octane rating not the pump octane rating. (r+m)/2 The research octane rating is higher than the pump label simply by the mathmatical equation. I am pretty sure the equation is correct. I use premium pump gas and I have yet to hear a ping and it seems to run great.
Just my 2 cents. :)

  • simon@vic

Posted March 18, 2004 - 07:06 PM


anything 91 and higher wil be fine.
AVOID SHELL GAS esp in canada.

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  • dominator426

Posted March 18, 2004 - 09:27 PM


Mine actually had a slight ping, especially in mid-RPM's, with the Esso 92 PON (pump octane number; r+m/2). It then worsened when they switched to 91 PON (=95 motor octane number, as prescribed in WR's manual) last fall. I will now run 1/3 100 LL(low lead) aviation fuel with 2/3 91 PON which will give me 94 octane fuel... We're not so lucky to have it readily available at the pump up here but we do have an airport. :)

  • simon@vic

Posted March 18, 2004 - 09:29 PM


i use chevron 94 or petro can 94. both are very good fuels.

  • JVP

Posted March 19, 2004 - 09:18 AM


I use a mix of race gas (110) and pump gas (91) at a 2 to 3 ratio. It is pretty close to the recommended octane of 95-96. I found that at the higher octanes there is no backfires on decelerations. This is just my opinion: The motor runs cooler with higher octane gas. Cooler is more power! :)

  • JVP

Posted March 19, 2004 - 09:21 AM


Why Shell? I herd this before. I use Shell in California with no problems? What's up? :)

  • ckulzer

Posted March 19, 2004 - 09:44 AM


I have had good luck with mixing 92 octane unleaded pump gas and 100 octane unleaded together in a 50/50 ratio. I was getting a slight ping under heavy, low rpm loads. My bike has only seen one tank of straight 92 since I bought it last spring.

The comment about popping is an interesting one - I have not had any bog or popping issues.

Ride fast - take chances



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