SOHC.co.uk Forums > CB750

Recutting valve seats

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taysidedragon:
That head looks in a right state. You might be chasing a lost cause trying to clean that up.
An expert machinist may think differently but I think you may be better off trying to get a different head.

Oddjob:
Tbh that head looks a bit junk so why not try and see if you can do it. I’ve used the genuine Honda tool for seat recutting. It’s air driven and uses stones not metal cutters. The original tools for the 500/550 were however metal and hand operated, try and look for something similar and have a go.

Grewth:
I've got a couple of heads in a similar state.
Plus one that some idiot shot blasted with the valves and springs in place.
I'll be watching this with some interest.
Hopefully you'll be able to save it.
You're not charging yourself for your time, so an alternative approach might save the day, even if it's not economically viable in a commercial repair shop.

Bryanj:
Those valves are not safe to use in my opinion, when i said grinding i meant what oddjob said as in shaped grinding stones not grinding paste and a stick.

To even touch the seats on that head would need a Newway cutter set and sit down before you check the price of a kit, i have one bought at auction, no i wont lend it out, reaso is they have tungsten carbide tips not hss and just for info an ebay advert for a set

AshimotoK0:
Wasn't there a Honda kit that was loaned around dealers to recut valves of certain type that were not Stellite ( or similar) faced but solid   Trigger had one
 (I  think Julie sold in on here). Graham (Trigger) reconditioned my CB750K0 cylinder head (new guides from Yamiya which I think he told me are the biz).  I deffo didn't get new valves though.

 My CB750 and CB92 Genuine Workshop Tool kit both have 3-angle hand cutters set in them ... so I would guess that's what Honda dealers were intended to use those in the first instance to recut the valve seats.

Berni Saunders ( Honda restoration guy) always talks about a Serdi machine or something ... I guess Bryan/Graham/Ken will know about that.

I got some bargain Neway cutters from a member here and they do look good quality as Bryan says. Think it was from a member who used it once and was emigrating .... Bryan will know who he is.

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