Aaron, that big doo-dad is the rev counter drive gearbox (tacho drive).
Thanks Ryan, yours is the early cam that I need, Spokes has the later one that he will loan to me.
Would you loan or sell the cam and I do need the rev counter drive as I have two that are both tatty.
The drive is held in place by 4 cross head screws just the same as on the head with no drive.
The 4th screw (the top one) is inside the body and is accessed by removing the 12mm bolt which lines up with internal screw.
On the end of the 12mm sealing bolt you will notice a little titty, the titty locates into a small recess in the bush/sleeve that the cable drive sits in.
To remove the bush and drive, undo the knurled blanking cap where the cable would go in. Inside should be a seal, remove the seal and withdraw the cable gear. The bush should then be able to be slid out exposing the 4th top cross head screw deep in the housing. When removing this screw, take care not to damage the threads where the 12mm bolt with the titty locates.
With all 4 screws out the empty rev counter housing should just pull off.
Once off, you will notice that the bush that the right hand end of the cam runs in is part of the rev counter housing.
Hope you can help Ryan or anyone else with this type of cam and drive.
Regards Sam.
