Not worked on the 661 myself Randy...so is the filter box force fed ?
Have worked on the Dolmar 9010 with its older sort of 2 section cover but has a much simpler filter unit.
As best as i can see from the odd pic iv found ..the intake on the standard cover on the 661 seems to be on the same side as the chain , wonder why . Pic of 9010 back end for you (intake on the other side to chain) ...
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