CB550 1977 F2 twin disc conversion

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Sesman:
WARNING. There exists multiple conversion guides on this topic. The most popular one advises that to retain the original Speedo drive you need to machine the Speedo drive ring flat and secure it to the hub using flat head screws. I have the round hub. Beware, this doesnâ€™t work on the 1977 F2 hub as firstly the screws need to be located towards the perimeter of the machined drive plate and secondly the Speedo drive will foul the drive ring unless the screws are countersunk flush. Iâ€™m not sure if a small shim between the Speedo drive may help. Advice welcomeâ€¦.

I found this out when I assembled the axle; the Speedo drive became locked solid with the Speedo drive ring! Itâ€™s bit of a dangerous oversight in my view :o

Or what did I do wrong?

Bryanj:
The way with the round hub is to machine the back of the disc holder to accept the ears on the speedo drive

Sesman:
Disc holder? According to the guides on this forum there are three parts: dress ring, Speedo retainer and Speedo drive.

Can you expand on the machine piece please?

Sesman:
Sorry, do you mean the actual disc rotor itself? The guide in Alladiins cave recommends for the round hub machining the retainer flat and securing it with screws. Which Iâ€™ve found to be bollocks.

Spare retainer drive anybody please?

Nurse Julie:

--- Quote from: Sesman on June 11, 2021, 01:22:15 PM ---Sorry, do you mean the actual disc rotor itself? The guide in Alladiins cave recommends for the round hub machining the retainer flat and securing it with screws. Which Iâ€™ve found to be bollocks.

Spare retainer drive anybody please?

--- End quote ---
Have a look through Grahams post, I'm not sure if the forks on his Mongrel are the same, or similar to yours but it may help a little.
He's done a twin disc conversion to this bike and so far, he is totally unimpressed and says 2 discs don't give any superior braking than 1 disc.
http://www.sohc.co.uk/index.php/topic,20419.0.html

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