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That was the way all the bikes came out first. (I know you know that) They used the rocker box banjos and then to the airbox . There STILL was oil getting to the air box. My bike was worse with the original way using rocker box/banjos. The real problem is the excessive clearance piston to cylinder creating all the extra pressure. There were so many issues its hard to keep track :wet sumping , too much oil pump leakage back to sump (mine did this) , weak scavenge (got a new oil pump worth every penny) , oil tank over filling , and lastly piston/cylinder/rings clearance . My bike as sent to me as new would have put 200~300 ml of oil into the airbox in 350 miles of riding (75 mph) and many 961 did this . Now it deposits 13~20 ml in 350 miles (75 mph). And I still have the original pistons/cylinder only a re-ringing at 6300 miles . I know you know this FE , but there are 961's out there that get virtually NO oil in the air box . Norton needed to reject all of the out of spec pistons/cylinders , but whoever built the engines didn't and passed them through.
That was the way all the bikes came out first. (I know you know that) They used the rocker box banjos and then to the airbox . There STILL was oil getting to the air box. My bike was worse with the original way using rocker box/banjos. The real problem is the excessive clearance piston to cylinder creating all the extra pressure. There were so many issues its hard to keep track :
wet sumping , too much oil pump leakage back to sump (mine did this) , weak scavenge (got a new oil pump worth every penny) , oil tank over filling , and lastly piston/cylinder/rings clearance . My bike as sent to me as new would have put 200~300 ml of oil into the airbox in 350 miles of riding (75 mph) and many 961 did this . Now it deposits 13~20 ml in 350 miles (75 mph). And I still have the original pistons/cylinder only a re-ringing at 6300 miles . I know you know this FE , but there are 961's out there that get virtually NO oil in the air box . Norton needed to reject all of the out of spec pistons/cylinders , but whoever built the engines didn't and passed them through.
