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Haynes Manual 'Translations'

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Laverda Dave:
I read an interesting method of getting ONE of the pins out Dave.. you drill a hole through the cover facing the pin and knock it out with a drift though the hole than weld it up again . A bit drastic I know but those things are absolute b*stards to remove. Also on the valve seats the guy TIG welded a bar across the seat and put a bar through the guide and heated the head and tapped it out.

Interesting methods Ash. Did you get your pins out without resorting to the drilling /welding method? I do wonder if Haynes actually removed the pins or just left them in and if the rockers are ok why would you bother to take them out anyway (and as long as you didn't vapour blast the rocker cover, that would be a mistake!). I certainly wouldn't want to do it again having had them snap in the casting.

AshimotoK0:

--- Quote from: Laverda Dave on December 02, 2025, 09:06:30 PM ---I read an interesting method of getting ONE of the pins out Dave.. you drill a hole through the cover facing the pin and knock it out with a drift though the hole than weld it up again . A bit drastic I know but those things are absolute b*stards to remove. Also on the valve seats the guy TIG welded a bar across the seat and put a bar through the guide and heated the head and tapped it out.

Interesting methods Ash. Did you get your pins out without resorting to the drilling /welding method? I do wonder if Haynes actually removed the pins or just left them in and if the rockers are ok why would you bother to take them out anyway (and as long as you didn't vapour blast the rocker cover, that would be a mistake!). I certainly wouldn't want to do it again having had them snap in the casting.

--- End quote ---

Luckily my whole CB250RSA top end apart from the cam is NOS Dave. I had the cam reconditioned by Newman Cams . I did get two cam covers with the bike though and can confirm that the pins are sods to get out and very brittle too.

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