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Thanks all and Charlie I went ahead with the HMB pump. On its way
I was wondering rodekyll if the helical gears would be slightly longer and gave more pumping surface but the more I think about it the helical gears may try to get away from each other and cause pump body wear at each end , maybe stick to whats tried and tested but whos is the best or just go NOS. Ill see what others have to say
thanks for the heads up Lucky Phil & did see somewhere on a Ducati site I think where you give Joe a write up but don't think he does the old tapered shaft pump., I have already ordered a pump from HMB and its advertised as helical gears . They were the only business to give a good write up on there pumps, the others T.L Stein dense, Scrambler, just pushed a picture under my nose so HMB got my money