SOHC.co.uk Forums > CB500/550

Tappet covers

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philward:
I use a 6 point 'flat' axle type spanner - being flat, there's no tendancy to twist off that occurs with an ordinary spanner as the force is fully in line with the thread your turning. Back in the 70's I made an exact fit spanner from some flat bar as 17mm is a sloppy fit on the cap. (and subsequently have lost it).

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JezzaPeach:
Mine measure just under 17mm. I used a 17mm ring spanner as (unintentionally) it seemed to have the effect of keeping the force low down, reducing twisting. I used moderate taps with a club hammer as it gives a steady accurate firm sharp one-off tap. Not perfect but for me it minimised marking on the tightest one. Sure enough as others find, the seals were flat and hard, and someone had over tightened the caps which were leaking slightly. I wonder if that special grip paste might help, or something like a shim to make a 17mm spanner fit more tightly, although my outcome was ok. The slightly marked one can be moved out of sight!

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