Britbike forum Forums Thread Like Summary - A65 Rocker Arm Ball Pins

Hi all,

Has anyone ever replaced the ball pins in the A65 rocker arms?

I'm just wondering what is involved. Is it simply a case of pressing, or drifting the old ball pins out and new ones in?

How tight is the interference fit and is there anything else that need to be done, or is cause for concern?

Cheers,

Kev E

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It could be they are substituting triple pins for the A65. Triple pins do not have the drilling.

Kevin,

I just have a one-ton arbour press and they are not hard to press out.

I broke that push rod cap on my 600cc B50 because the pushrod was too short. Having said that, today I took my T100 out for the first time since I rebuilt it for the second time, having replaced the exhaust valves, and didn't get 5 miles (running very well with no oil leaks) before the left cylinder got a tap-tap-tapping noise. I turned around to limp home, but didn't make it. Removed the valve adjustment cover on the left exhaust rocker to find it wasn't moving. I'm sure it's a broken pushrod cap, so I'm not immune to having it happen again. So off with the rocker box again to check it out. I just put in new oversize exhaust valves and had the seats professionally done, so I'm at a loss to know what is causing this problem. Too long or too short or WTF!

I used copper rocker box gaskets this time, so maybe the pushrods are too short now?

Tom