SOHC.co.uk Forums > CB650
CB650 carbs
Raymond_Y:
Hi, I have a 1980 CB650 engine that I intend to use for a future care racer project and have a question on the carbs. I have a couple of sets of carbs (069A and PD46) which I hope I can use for the project. My question is around the carb size. All the specs I have found suggest a 1980 CB650 had PD51 carbs that were 26mm. However, if you measure the internal diameter of the inlet stubs they are 30mm, which seems strange. Could I use the PD46A’s or should I consider perhaps taking the opportunity to fit bigger carbs?
Raymond
andy120t:
I use carbs from a GPz600 on mine and it runs OK with those and four separate air filters. I seem to remember there were a couple of different heads / inlet ports spacing when I was investigating. As it was built up from a box of parts I didn't ever have the orginals so I'm not sure of specs for those.
I don't have a link to the info I used at the time, but it's somewhere on the US SOHC website - they have a lot more cb650 stuff / interest on there.
..and I just searched 'gpz carbs on cb650' in google and it brought up a few threads and youtube videos that could help. (eg) http://www.dotheton.com/forum/index.php?topic=68816.210
Hope that helps!
Raymond_Y:
Thanks for the input. Fortunately, I have managed to source a set of PD51A carbs that I can refurbish. Did not expect there to be any available as the CB650 wasn’t very popular.
Raymond
hairygit:
--- Quote from: Raymond_Y on April 03, 2019, 05:49:28 PM ---Thanks for the input. Fortunately, I have managed to source a set of PD51A carbs that I can refurbish. Did not expect there to be any available as the CB650 wasn’t very popular.
Raymond
--- End quote ---
Truth is PD carbs are even less popular than the CB650, most owners quickly look for different carbs, especially on 550K3's and 750F2's.
Sent from my X6pro using Tapatalk
Raymond_Y:
What is it specifically people don’t like about PD carbs. Is it just that they are a bit more difficult to set up accurately, because they are a “lean” carb to meet emissions regs?
Raymond
Navigation
[0] Message Index
[#] Next page
Go to full version