• Welcome to the forum website of the Vincent H.R.D. Owners Club.

    Should you have any questions relating to the Vincent H.R.D. Owners Club, or Vincent H.R.D. motorcycles in general, please contact Graham Smith, Online Forum Webmaster by calling 07977 001 025 or please CLICK HERE.

    You are unrecognised, and therefore, only have VERY restricted access to the many features of this forum website.

    If you have previously registered to use this forum website, you should log in now. CLICK HERE.

    If you have never registered to use this forum website before, please CLICK HERE.

comet engine to egli twin frame


Well Known and Active Forum Website User
VOC Member
Yes, there are a few problems, but it has been done. The swing arm location is different on the Comet when compared to the twin. It is an inch forward and a half inch up, if I remember correctly. Also, the shortened wheelbase can cause the rear wheel to fowl the crosswise fender brace on the rear down tubes of the Egli twin chassis. Thus, on the Egli Comet frames, this brace had a deeper curve in it than the twin. All other dimensions are the same. These issues can be overcome with some ingenuity and welding, although I have never personally seen the modifications on a machine. If you have an original Egli or Slater frame, these modifications would probably diminish the value of the frame. However, if you do not have a frame you can easily purchase an Egli Comet frame from Andy Sidlow or Cyril Malem. It might also be worthwhile to sell the twin frame and buy the correct Comet frame.
The Norton box is a good idea and has been done on many Comets. I make my own plates and I have chosen a slightly different location for the swing arm, but there is no magic, it is just a bit of work making plates. If you are going to attempt this type of project, I would suggest that you join the VOC and correspond with the Egli Section Organizer. He can be surprisingly useful with technical details and photographs.



Well Known and Active Forum Website User
VOC Member
VOC Forum Website Administrator
VOC Forum Website Moderator
Unfortunately, it is not an automatic process to match up forum users with their VOC membership status.

At the very top right, click on My Profile. One of the boxes on the left side says Permission Groups. Click Join Groups, and follow the instructions. Once you submit the requested information, it is a manual process to verify your VOC membership, and if all is well, your forum status will be updated.
Warning! This thread is more than 12yrs ago old.
It's likely that no further discussion is required, in which case we recommend starting a new thread. If however you feel your response is required you can still do so.