Post by: yozzer74 on March 02, 2017, 10:22:03 AM
Post by: yozzer74 on March 02, 2017, 11:38:12 AM
Post by: Bryanj on March 02, 2017, 02:18:58 PM
Post by: yozzer74 on March 02, 2017, 02:50:01 PM
Post by: onethumb on March 02, 2017, 04:45:14 PM
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Post by: philward on March 02, 2017, 07:11:44 PM
Post by: MarkCR750 on March 02, 2017, 08:38:05 PM
Post by: onethumb on March 02, 2017, 10:46:57 PM
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Post by: yozzer74 on March 02, 2017, 10:52:02 PM
Post by: mike the bike on March 03, 2017, 07:43:59 AM
http://www.sohc.co.uk/index.php/topic,11851.msg90777.html#msg90777
Post by: Bryanj on March 03, 2017, 02:28:02 PM
Post by: yozzer74 on March 03, 2017, 03:23:15 PM
Post by: MarkCR750 on March 03, 2017, 03:39:55 PM
Post by: Tomb on March 03, 2017, 03:47:11 PM
Post by: paul G on March 03, 2017, 04:10:41 PM
If its simply a valve guide, could you not use a compressor connected to the plug hole to hold the valve up, and do the job with the engine in with head on. Or the rope trick.
I have done the rope trick before, certainly worth it just to check if the stem seals are on correctly.
Post by: Bryanj on March 03, 2017, 05:53:33 PM
Post by: hairygit on March 03, 2017, 05:57:50 PM
Post by: MarkCR750 on March 03, 2017, 06:37:08 PM
(http://i1269.photobucket.com/albums/jj582/POR1983/IMG_0582.png) (http://s1269.photobucket.com/user/POR1983/media/IMG_0582.png.html)
Post by: hairygit on March 03, 2017, 07:21:20 PM
Post by: hairygit on March 03, 2017, 07:22:49 PM
Post by: neilg on March 03, 2017, 07:31:09 PM
Post by: haynes66 on March 03, 2017, 07:53:22 PM
Post by: MarkCR750 on March 03, 2017, 08:11:44 PM
Post by: yozzer74 on March 15, 2017, 09:15:40 PM
Post by: MarkCR750 on March 16, 2017, 10:36:46 AM
Post by: yozzer74 on March 16, 2017, 02:22:27 PM
Post by: Bryanj on March 16, 2017, 04:08:27 PM
Post by: yozzer74 on March 16, 2017, 04:28:23 PM
Post by: neilg on March 17, 2017, 10:18:20 AM
Post by: yozzer74 on March 17, 2017, 11:59:47 AM
Post by: MarkCR750 on March 17, 2017, 07:26:55 PM
Post by: yozzer74 on March 17, 2017, 07:51:47 PM
Post by: steff750 on March 17, 2017, 08:09:26 PM
Quote
Yeah checked it no blockage the breather that comes out of crank case should go to oil tank yesthat should be the gearbox breather (the thin pipe) . i can safely assume you have left the top engine breather and the oil tank breather to just hang down behind the battery(these are the thicker pipes} I have seen cases that people have mistakenly joined the engine breather to the oil tank that thens pressurizes the oil tank ? forcing oil out on to the back wheel very naughty ;)
Post by: Bryanj on March 17, 2017, 10:59:43 PM
Post by: yozzer74 on March 21, 2017, 03:37:41 PM
Post by: Greebo on March 21, 2017, 03:46:48 PM
Post by: yozzer74 on March 21, 2017, 03:50:18 PM
Post by: Greebo on March 21, 2017, 03:53:25 PM
I'm in contact with Steve he's helping me out with things on engine cheers
Nice one Yozzer, he is shit hot with that motor....
Ive not seen Steve for a while...remember me to him when you next speak
Post by: paul G on March 21, 2017, 04:00:40 PM
Is that Steve at Rotherham classics !I'm in contact with Steve he's helping me out with things on engine cheers
Nice one Yozzer, he is shit hot with that motor....
Ive not seen Steve for a while...remember me to him when you next speak
Post by: yozzer74 on March 21, 2017, 05:05:19 PM
Post by: yozzer74 on March 21, 2017, 07:13:49 PM
Post by: philward on March 21, 2017, 07:28:47 PM
Post by: yozzer74 on March 21, 2017, 07:32:14 PM
Post by: Nurse Julie on March 21, 2017, 07:42:51 PM
Post by: yozzer74 on March 21, 2017, 07:45:51 PM
Post by: Nurse Julie on March 21, 2017, 07:47:33 PM
Post by: paul G on March 21, 2017, 08:39:31 PM
It does look like that on pic. but it's not ;DYozza try IMD pistons, I have had. Few bits from him.
Imd pistons.com
Post by: yozzer74 on March 21, 2017, 08:49:24 PM
Post by: paul G on March 21, 2017, 09:04:30 PM
Thanks I've sent them a emailYozza just seen these on eBay, any good item No 292063073922
Post by: Trigger on March 21, 2017, 09:24:53 PM
Thanks I've sent them a emailYozza just seen these on eBay, any good item No 292063073922
K and F2 units have different pistons and rings ;)
Post by: yozzer74 on March 21, 2017, 09:26:30 PM
Post by: Trigger on March 21, 2017, 09:40:59 PM
Any ideas trigger were I could get some cmsl have 3 sets in stock
If you can lay your hands on three sets 0+75, you can buy one set of 1.00 and grind them to spec. You must know what you are doing, to do this type of ring grind.
Post by: yozzer74 on March 21, 2017, 09:42:47 PM
Post by: Trigger on March 21, 2017, 09:45:19 PM
Yeah the bloke at machine shop told me that . But he wasn't too sure about the oil rings
The oil rings just take longer to grind. Sometimes its the only way.
Post by: yozzer74 on March 21, 2017, 09:47:50 PM
Post by: yozzer74 on March 22, 2017, 10:43:05 AM
Post by: bytio on March 27, 2017, 07:57:16 PM
http://www.scheuerlein-motorentechnik.de/motorrad/Honda/700-799-ccm-h7/cb750four-modelle/cb750f1/
Excellent quality, I used them on my F2, (they have them for Ks and F1s as well) I had the same oil burning problems went through 2 over size steps new guides etc, still burning, the cause eventuall found the machine shop boring he Barrells made the clearances too big, I did lots of research and consulted Hondaman (and his book) I insisted on this clearance, the shop said it would seize, and wrote a disclaimer. I got the clearance I needed, the bike ran perfectly, and never used as to of oil, oh and it didn't seize.!1
Post by: philward on March 27, 2017, 10:23:04 PM
http://forums.sohc4.net/index.php?topic=89779.msg1005284#msg1005284
I used the recommended smaller clearance on my 836 cruzinimage big bore kit - 850 miles and so far so good. I am not sure what clearance the guy who bored my barrels used on my CR750 current build - he may have used the standard tolerences (I am now doubting myself whether I insisted on the smaaler clearance as I did on the last build) - time will tell when I start it up!
Post by: royhall on March 28, 2017, 08:06:16 AM
This company does pistons and rings up to +4mmI agree. My 350F was left to the engineer to fix the boring size, just left him the barrels and 4 new pistons. Although he did a good job I am now thinking its going to need boring again. Smoking on two cylinders and using oil. I'm pretty sure he's bored it to a standard clearance as he's more used to doing British iron and that has about 5 thou clearance. What is the recommended clearance on a 350F, Hondaman recommends .0010" to .0012" but that's for the 750?
http://www.scheuerlein-motorentechnik.de/motorrad/Honda/700-799-ccm-h7/cb750four-modelle/cb750f1/ (http://www.scheuerlein-motorentechnik.de/motorrad/Honda/700-799-ccm-h7/cb750four-modelle/cb750f1/)
Excellent quality, I used them on my F2, (they have them for Ks and F1s as well) I had the same oil burning problems went through 2 over size steps new guides etc, still burning, the cause eventuall found the machine shop boring he Barrells made the clearances too big, I did lots of research and consulted Hondaman (and his book) I insisted on this clearance, the shop said it would seize, and wrote a disclaimer. I got the clearance I needed, the bike ran perfectly, and never used as to of oil, oh and it didn't seize.!1
Post by: bytio on March 28, 2017, 08:15:45 AM
Post by: Tomb on March 28, 2017, 08:21:34 AM
A good borer will ask what clearance you want, the last bore job I had done was by Lancaster Engines, brilliant old school engineers.
http://www.lancasterengines.co.uk/classic-car-vintage-engine-reconditioning-services-in-lancaster/
Post by: royhall on March 28, 2017, 08:45:51 AM
I had similar experience but the opposite way round, I had a Triumph Daytona (cast iron block) bored to fit new high compression Hepolite pistons, the borer did Jap bike tolerance of two thou when I'd asked for 5 thou, the engine seized!!.I assume these guys are not the ones responsible for the seizure.
A good borer will ask what clearance you want, the last bore job I had done was by Lancaster Engines, brilliant old school engineers.
http://www.lancasterengines.co.uk/classic-car-vintage-engine-reconditioning-services-in-lancaster/ (http://www.lancasterengines.co.uk/classic-car-vintage-engine-reconditioning-services-in-lancaster/)
Post by: Tomb on March 28, 2017, 10:23:25 AM
Lancaster Engines, brilliant old school engineers.
Lancaster Engines are superb, no I have no connection to them before anyone asks. ;D They were extremely helpful when trying find oversize liners for my CB72/CL77 project racer.
I was a Toolmaker for 18 years and now a Mech Tech at a well known Pharmaceutical site for 18 years so appreciate proper engineers, which they are. The tight bore was done by a local motorcycle shop, in fairness it was an Ok job and probably would have worked well on a Jap engine but was not what I asked for. The Triumph engine nipped up within the first 1/2 mile of very gentle running, stripped and honed more by me and ran very gently for a long run in period, never nipping again.
Post by: royhall on March 28, 2017, 11:55:30 AM
Post by: Greebo on April 14, 2017, 10:36:34 AM
I'm in contact with Steve he's helping me out with things on engine cheers
Yozzer
I was over at Steve's place yesterday he said you had called a couple of times to asking for his help & advice, from what you told him about the work you had done, his thoughts were those who had done the rebore could have took too much out of the barrels, so he offered to try & get you a set of Barrels, which are hard to find, but he has now got a set, he spent some time sourcing them for you, but he tells me you have not been in touch since.
it made me feel a bit awkward because I put you in touch with him.
Post by: yozzer74 on April 14, 2017, 10:50:24 AM
Post by: Greebo on April 14, 2017, 04:54:08 PM
No he told me he had some in shop that he's had for a few years and I could have a look if I needed them . I haven't had a rebore on my set of barreles so don't no why he would think that . We must have got our wires crossed .
Yozzzer
I did think I had heard the story right but might have heard it slightly wrong its amazing how stories can vary though... :o
No worries on my part I was just trying to help in the first place thats why I put you onto Steve, I think in future I will keep my Nose out. :-[
I hope you get it sorted.
Post by: yozzer74 on April 26, 2017, 08:38:36 PM
Post by: Trigger on April 26, 2017, 08:44:26 PM
Post by: JamesH on April 26, 2017, 08:48:10 PM
Post by: yozzer74 on April 26, 2017, 08:51:49 PM
Post by: philward on April 26, 2017, 09:01:51 PM
Post by: yozzer74 on April 26, 2017, 09:05:11 PM
Post by: MarkCR750 on April 26, 2017, 10:29:08 PM
Post by: Dazza215 on April 27, 2017, 10:05:16 AM
Post by: paul G on April 27, 2017, 01:06:53 PM
Post by: onethumb on April 27, 2017, 04:54:15 PM
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Post by: Spitfire on April 27, 2017, 07:07:46 PM
Cheers
Dennis