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steampunk

Athena big bore (478) jetting question

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

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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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