Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: bomber on December 01, 2014, 10:28:50 PM

Title: Valve seat guide
Post by: bomber on December 01, 2014, 10:28:50 PM

So, after almost 6 months and two broken exhaust valve seats guides, I'm looking for a new engineering shop who can do it...
Is it really difficult to do? I thought, you need press and bloody push old one out and then squeeze new one in after freezing it.

I didn't get charged for work, and they did honed cylinder block but I rather have job done.

Bloody boooring.

Any one can recommend a place to do this job around London preferably North London?

Thanks

Title: Re: Valve seat guide
Post by: Trigger on December 01, 2014, 11:11:32 PM

Valve seats? or valve guides?
The valve guides go in by heating the head and freezing the guides, then a air hammer. Valve seats, well that is a secret.

Title: Re: Valve seat guide
Post by: Lobo on December 02, 2014, 04:38:44 AM

Bomber,

Google 'Stotfold Engineering' (Biggleswade). Terry Ives is the man... a down to earth & very approachable chap. Restored a 400F engine of mine 2 years ago... very happy.

Cheers,
Simon.

Title: Re: Valve seat guide
Post by: andy_c101 on January 05, 2015, 08:37:37 PM

Needs use of the valve guide installation tool(c/o David Silvers) & Heat-n-freeze!
Andy

Title: Re: Valve seat guide
Post by: Trigger on January 05, 2015, 09:45:49 PM

The problem with valve guide these days is they are crap metal (even the ones that come in Honda Bags). I am finding that the quality is that bad that they distort when putting them in. I prefer to make my own so that i get a good match to the valve, a bit like matching a piston when doing a re-bore.

Title: Re: Valve seat guide
Post by: Saisei on January 06, 2015, 01:48:24 PM

Kibblewhite do some very high quality valve gear

http://www.saisei-europe.com/Shop/Products/c/engine-parts/p/intake-guide-std-cb-750-sohc

Title: Re: Valve seat guide
Post by: Trigger on January 06, 2015, 03:35:50 PM

Quote from: Saisei on January 06, 2015, 01:48:24 PM

Kibblewhite do some very high quality valve gear

http://www.saisei-europe.com/Shop/Products/c/engine-parts/p/intake-guide-std-cb-750-sohc

How much? That is a stupid price as you can use a K-liner.

Title: Re: Valve seat guide
Post by: Bitsa (Ralph Wright - RIP) on January 06, 2015, 07:38:31 PM

I have only ever replaced one valve guide cos it had cracked and that was a C50.Must be lucky all the fours I have rebuilt guides have been good
Cheers
Bitsa

Title: Re: Valve seat guide
Post by: bomber on February 03, 2015, 10:26:03 PM

Thank you Lobo for recommendation, I will see what's gonna happen, I found a nice old gent locally who will try to do it for me.
I dont know if it is materials or what, but not impressed with the way previous engineer dealt with the whole situation.
I'm over it now, just want to ride.

Thank you guys for all info, I will have my CB on the road this year... I hope.