Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: MikeM on August 16, 2014, 10:25:54 AM

Title: changing valves to different head
Post by: MikeM on August 16, 2014, 10:25:54 AM: changing this head of mine

is it simply a matter of cleaning up faces for the new gaskets ?

also valves after lapping in do the valves have to go back into same place from old head
Title: Re: changing vales to different head
Post by: hairygit on August 16, 2014, 11:19:08 AM: Valves need to go in whichever hole they were lapped to. If moving valves from one head to another, they will need lapping to the new head :D :D
Title: Re: changing vales to different head
Post by: Paull on August 16, 2014, 11:49:47 AM: And just to add when the valves are lapped in fill the crowns with petrol to see if they leak.

If not job done. :) :)

Paul
Title: Re: changing valves to different head
Post by: ka-ja on August 16, 2014, 06:41:19 PM: Hi,
electric drill is quicker!
Title: Re: changing valves to different head
Post by: MikeM on August 16, 2014, 08:30:36 PM: because its my first time going to use something that easy going, seen the drill video on youtube but don't fancy myself with that
Title: Re: changing valves to different head
Post by: Trigger on August 16, 2014, 08:41:32 PM: Electric drill? Bloody cowboys >:(
Title: Re: changing valves to different head
Post by: MikeM on August 16, 2014, 08:54:32 PM: from what I can tell once you get a smooth ring on both faces your good to go ?

also does the part the valve slides into need to come out ? original head has new stem seals

valve guides ?
Title: Re: changing valves to different head
Post by: Johnwebley on August 16, 2014, 10:48:30 PM: Quote from: Oddjob on August 16, 2014, 10:26:04 PM
Speaking of that I've found my original Honda CB500/4 valve guide reamer. Not seen it for ages and it was hiding in my Snap On box. As I doubt very much whether I'll ever use this again I may donate it to someone on the understanding they will lend it to whoever needs it.

Oddjob,

it might be an idea to have a separate thread, "Special tools for loan"

the user pays postage ,and returns after use

perfect for smaller items
Title: Re: changing valves to different head
Post by: ka-ja on August 17, 2014, 09:39:26 AM: Hi,
The electric drill reference was being sarcastic, although I have known one to be used. Slow and steady and not too much pressure, lifting the valve off its seat for a 1/2 turn now and then during grinding is the only way!
Title: Re: changing valves to different head
Post by: Bryanj on August 17, 2014, 10:18:50 AM: Oddjob, i would take over the reamer if you wanted, i have several heads if i can ever afford the guides!!
Title: Re: changing valves to different head
Post by: Trigger on August 17, 2014, 10:39:12 AM: Bryan, it is easier to put K-liners in.
Title: Re: changing valves to different head
Post by: Bryanj on August 17, 2014, 06:09:05 PM: K liners cost a lot to do mate, oddjob i will send you my address, no rush mate i still have to sort out all my special tools!!, i do have a copy of the common tools list if you would like a scan when i aint rushing back and forth to hospital for the boy!
Title: Re: changing valves to different head
Post by: Trigger on August 17, 2014, 08:28:37 PM: Bryan, the last box of 100 K-liners i got from the states was £40.
Title: Re: changing valves to different head
Post by: mickwinf on August 17, 2014, 10:55:06 PM: what the f is a k liner?
Title: Re: changing valves to different head
Post by: Trigger on August 17, 2014, 11:05:45 PM: Mick, in my spare time i do engines for the drag racing boys and we use them because the NOS gas and high temperature makes the standard valves stick in the valve guides.
A K-Liner is a Bronze bullet valve guide. So if your valve guides are worn you can re-cut and put a bronze bush in.