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SOHC.co.uk Forums => CB750 => Topic started by: Bitsa (Ralph Wright - RIP) on April 24, 2012, 02:25:55 PM

Title: cb750 head gasket
Post by: Bitsa (Ralph Wright - RIP) on April 24, 2012, 02:25:55 PM
Hi,
Is this a bargain or not on eBay?
Item 200747349556 Part number 12251 300 004  12.99 dollars.
If you can find it DDS 49 quid cmsnl 94 euros is this a dodgy deal?
Your views
Regards
Title: Re: cb750 head gasket
Post by: mick on April 24, 2012, 03:10:44 PM
Hi Bitsa looks like a good deal Paul Miller is quite well known of, also check out these http://stores.ebay.com/cruzinimageco1484
Title: Re: cb750 head gasket
Post by: Bitsa (Ralph Wright - RIP) on April 24, 2012, 04:01:47 PM
Yo Mick,
Thanks for your info nice site.As with the head gasket looks like I will have one for spares and also a base gkt which is a bit more money,cant work that one out but what the hell good deals are far and few between these days.
Cheers
Bitsa
Title: Re: cb750 head gasket
Post by: UKROBK7 on April 24, 2012, 06:39:54 PM
Thanks.  Just bought one to use in my rebuild instead of using the pattern part - let's see what turns up, worth the risk!  Just hope Postie doesn't decide to try and fold it!

rob
Title: Re: cb750 head gasket
Post by: the-chauffeur on April 24, 2012, 09:50:08 PM

If your bike is a K0-K3, you might want to have a look at my post on the subject in the Tips and Tricks section . . .
Title: Re: cb750 head gasket
Post by: UKROBK7 on April 25, 2012, 05:36:36 PM
Just checked on DS site, cost is now £86.80 including VAT for superceded part number 12251-300-306.  I have been told that the one I ordered yesterday from your link has been despatched from USA.

rob
Title: Re: cb750 head gasket
Post by: Bitsa (Ralph Wright - RIP) on April 26, 2012, 12:55:46 PM
UKROBK7,
Yes mine too with tracking number.Tempted to buy them all for resale !!!!!!!
Everwhere else getting silly now, nigh on a onena for a gasket,sucks.
Regards
Bitsa
Title: Re: cb750 head gasket
Post by: Bitsa (Ralph Wright - RIP) on May 03, 2012, 12:40:16 PM
UKROBK7.
Head gasket arrived today tiny distortion but will be OK.Laid it on a flat surface with big weight on top.Like I said will be OK to use.
Really good stuff for the price.Have you got yours yet?
Regards
Bitsa
Title: Re: cb750 head gasket
Post by: UKROBK7 on May 03, 2012, 05:42:46 PM
No, it never moved on the tracking system so I contacted them.  They weren't certain what happened but it disappeared off the system so they shipped another on the 1st May.  Its on the tracking system and it looks like its left the USA.  It should be here soon - I hope! 

Rob
Title: Re: cb750 head gasket
Post by: Waggles on May 04, 2012, 09:12:17 AM
Showing my age I know, but I have always preferred copper head gaskets. Maybe out of the question now with the price of copper as it is but was just idly wondering if anyone has tried making one? or is there a reason for not doing so?

Appreciate you may still need sealing rings for the oil ways but copper can be used more than once after annealing etc and I have always hated fibre ones and thought they were a cost saving item.

I remember my old four valve Trudge blah blah blah ...........
Title: Re: cb750 head gasket
Post by: hairygit on May 04, 2012, 09:25:09 AM
I think Honda would have used copper if it had offered any advantage over the composite gaskets, after all, stamping a gasket from a sheet of copper would be far easier (and cheaper) than making the composite ones, so Honda obviously had good reason for going down the composite route ;D
Title: Re: cb750 head gasket
Post by: Tomb on May 04, 2012, 11:38:17 AM
Showing my age I know, but I have always preferred copper head gaskets. Maybe out of the question now with the price of copper as it is but was just idly wondering if anyone has tried making one? or is there a reason for not doing so?

Showing my age as well then coz I made one for my old Yam 1.1 a couple of years ago ;)  I was at the Wray bike meet with it last night.
 (http://i234.photobucket.com/albums/ee75/mcpuffett/543414_10150784686934948_506429947_11701432_1503599423_n.jpg)

(sorry I keep prattling on about Yamahahas on a Honda forum ::))

I spotted through the barrels to get hole positions and put the old head gasket on to draw round, then bolted it to some softish plastic for support and hacksawed and filed to shape. For the bore holes I fitted the gasket to the barrels and filed the copper exactly the right size, which is miles better than a bought gasket coz they're made "one size fits all". I used 0.9mm copper whereas the old gasket was 1.2mm thick, so slightly better compression.
(http://i145.photobucket.com/albums/r221/TomBiles/5K7sport/Sport019.jpg)

(http://i145.photobucket.com/albums/r221/TomBiles/5K7sport/Sport020.jpg)
Title: Re: cb750 head gasket
Post by: SteveD CB500K0 on May 04, 2012, 06:11:51 PM
Do you remember the Bike magazine test that was entitled "Nothing Exceeds like XS"  ;D
Title: Re: cb750 head gasket
Post by: UKROBK7 on May 05, 2012, 01:49:36 PM
BITSA, My "cylinder head gasket" turned up today.  This is what I got!!  Now in touch with them to sort it out.  According to the listing there are no more left.

Rob
Title: Re: cb750 head gasket
Post by: Bitsa (Ralph Wright - RIP) on May 05, 2012, 02:34:37 PM
UKROBK7.
Sorry mate it is at times like this I wish I had not said anything.I hope you get it sorted and I do not recognise the gaskets you got.
This is what I got.
Best of luck
Bitsa
Title: Re: cb750 head gasket
Post by: UKROBK7 on May 05, 2012, 05:05:54 PM
Not your fault!  it just seems to happen to me!!
Title: Re: cb750 head gasket
Post by: mick on May 05, 2012, 08:04:28 PM
Rob, i have heard of Paul Miller making these sort of mistakes before, wrong stuff in packet but from what i have heard he always makes things good,

cheers Mick.
Title: Re: cb750 head gasket
Post by: UKROBK7 on May 06, 2012, 07:58:42 PM
Thanks Mick, just waiting for a reply from him on Monday (looks like he doesn't open weekends).

Rob
Title: Re: cb750 head gasket
Post by: H2Eric on May 07, 2012, 10:01:42 AM
Dynoman Performance  dynoman.net (http://dynoman.net)  of Austin Texas has a range of head and base gaskets for the CB750

Eric
Title: Re: cb750 head gasket
Post by: UKROBK7 on May 07, 2012, 07:23:16 PM
Yes but not at £15.44 including postage for a genuine Honda one!!  :D

Rob
Title: Re: cb750 head gasket
Post by: UKROBK7 on May 10, 2012, 09:15:43 AM
Update on my wrong gasket:  Paul Miller sent a replacement yesterday.  Now to wait the 10 days to see what turns up!

Rob
Title: Re: cb750 head gasket
Post by: Bitsa (Ralph Wright - RIP) on May 20, 2012, 11:00:39 AM
UKROBK7,

Any news on your gasket YET?
Regards
Title: Re: cb750 head gasket
Post by: UKROBK7 on May 26, 2012, 01:20:26 PM
Just got back from a break to Egypt, boy was it hot!  8)  8)  The gasket turned up while I was away :D  BUT it is not what is shown on the listing  :(.  4 of the large diameter holes for the rubber collars are not there - they are smaller diameter.  No Honda packaging came with it but it looks genuine Honda as it has the "varnish " around the chain hole and 2 of the stud holes.  I have put a photo up - the top gasket is what arrived, the bottom gasket is from the Cycle-X kit.  The top (Honda) gasket has the oval fire rings which are as per Honda, the pattern one has circular fire rings.

Does anyone have any ideas what model 750 it fits?  The part number would be helpful too.

Rob
Title: Re: cb750 head gasket
Post by: UK Pete on May 26, 2012, 02:53:09 PM
Rob the top one is for an F2 this is the only one to have the oval rings due to them squeezing in larger valves
Where did you say you got the top one from?
Pete
Title: Re: cb750 head gasket
Post by: UKROBK7 on May 26, 2012, 05:57:32 PM
Thanks Pete, now I will have to buy an F2 to use it!!  :D  I wonder if my wife will understand?  I think I know the answer to that!

The guy I got it from is Paul Miller Motorcycles in the USA (ebay name = jrwdfa)

Rob
Title: Re: cb750 head gasket
Post by: archmill on June 04, 2012, 10:07:26 PM
UKROBK7, want to sell? I am building an F2.

Archmill
Title: Re: cb750 head gasket
Post by: UKROBK7 on June 05, 2012, 07:00:47 PM
Sorry, haven't got it, sold it straight away.

Rob
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