arkie suggested checking the air box.
Don't see that it's been looked at yet.
Sure sounds like it might be the filer or something in the box that doesn't belong there.
Hope you get it run ing right soon.
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There is a fine line between "hobby" and "mental illness."
Naked FZ1's can be a lot of fun.
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Current bikes: '82 CBX, '04 FZ1 (skunk)