When mine was stock.. And i ordered the Toomey B1 Racing kit, I found that the 310 was perfect.. It ran great.. and had blue smoke and all ... I never had a problem or rejettet.. And I also added the V-Force 3 ..
But like burningoil 2001 says, you are maybe able to finetweak it further.. ex 320 jet.. if that exists.. I never did it, but its possible it can be done..