23-11-2020, 11:49 AM
I think that the D type was used up to 1925, so if you want to be strictly accurate you would maybe want an MV with butterfly throttle.
I used a D type on my cup model when we first put it together. They are beautifully made and the casting seems to be of finer quality than the later models, but it had the same problems with getting a smooth transition from slow running to main jet as the MV does. The throttle pedal travel is also rather long as it has a longer lever on the spindle and I had endless problems with the grub screw which retain the barrel assembly coming loose, although that could probably be cured.
I would suggest using the MOV if you have one, the mixture bleed screw makes it easier to set up for smoother acceleration, although others will confirm that this is not necessarily a complete panacea!
I used a D type on my cup model when we first put it together. They are beautifully made and the casting seems to be of finer quality than the later models, but it had the same problems with getting a smooth transition from slow running to main jet as the MV does. The throttle pedal travel is also rather long as it has a longer lever on the spindle and I had endless problems with the grub screw which retain the barrel assembly coming loose, although that could probably be cured.
I would suggest using the MOV if you have one, the mixture bleed screw makes it easier to set up for smoother acceleration, although others will confirm that this is not necessarily a complete panacea!