Athena big bore (478) jetting question


2 replies to this topic
  • steampunk

Posted June 16, 2012 - 04:24 AM

#1

Just ordered a big bore kit for my 2005 yz450f SuperMoto bike and I was wondering if anyone can recommend jetting for my bike. It has stock exhaust with twin air filter. I checked the jetting database and couldn't find any thing for big bore bikes. Elevation is around 2000' average. Thanks in advance.

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  • bluthndr

Posted July 31, 2012 - 01:58 PM

#2

Mine (which I think is a normal 450) ran good with a 175 main and 50 pilot. I'd say start at least there.

  • yzfrider1

Posted July 31, 2012 - 09:29 PM

#3

Just ordered a big bore kit for my 2005 yz450f SuperMoto bike and I was wondering if anyone can recommend jetting for my bike. It has stock exhaust with twin air filter. I checked the jetting database and couldn't find any thing for big bore bikes. Elevation is around 2000' average. Thanks in advance.


I did a big bore on a 250f, and had to lean the bike out.





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