Tuesday, May 13, 2014

Dylan's 544 Entry 3: Adjusting those "mysterious" SU carburetors!

A mystery no more!  Some basic info about adjusting your SU HS6 Carburetors on a Volvo B-18 / B-20 engine!

There are some other adjustments I sort of glanced over (choke cable adjustment comes to mind) but this should get you going!

As always, if you have any questions or comments, please feel free to leave them below!


  1. When synchronising the carbs using your meter you should loosen the spindle clamp so the 2 carbs adjust independently. Retighten when equal. Yes the difference maybe small but you'll have adjusted it against the return springs so as soon as you open the throttle they will be a little bit out of synch again.
    Nicely done and congratulations on your new position. It's been awhile since the Amazon blew up..... :)

  2. Thanks for this.
    How do you sign up to be alerted to when your latest 544 video is uploaded? Thanks for helping out us mechanically-challnged PV lovers.

  3. Hi Jim! Google has a page describing the steps needed to follow a blog: https://support.google.com/blogger/answer/104226?hl=en

    Short of that, you could also subscribe to my youtube channel, provided you don't mind occasionally getting updates on my non-volvo videos I post! My youtube channel is https://www.youtube.com/user/radiodylanjames

  4. I've just added a "Follow me by email" option on the right side of the blog. You should be able to subscribe there!

  5. I am hoping that in a year and a half someone else has offered an explanation as to why the "lift pins" for the piston is so inconveniently located. Volvo has reversed the order of the SU carburetors from the typical British layout - which I think is a good idea as it makes the layout much more compact with the float bowls inboard. Thus when ordering parts from your friendly SU merchant you will need to be aware that the front carb is actually a rear carb and vice-versa.

  6. Thanks for this video. I have the same SU carburetors on my 1970 MGB. It seems I was either too rich or to lean on the mixture. After watching your video, I was able to establish a much needed baseline on the mixture making the fine tuning a piece of cake. My MGB has never run better. Thanks, Jerry