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Topics - archmill
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« on: May 24, 2022, 09:49:42 PM »
Front wheel off of a 1979 CB750 F2, DID 1.85 x 19 alloy in good condition. Filthy but will clean up good. With twin discs in good condition, spindle and speedo drive. One plastic "honda" rivet cover missing. Came off a bike with 15000 miles on it.
Anyone interested before I put it on Fleabay. Not needed as I am building a special with 17" ZZR600 wheels.
£50 plus postage.
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« on: October 16, 2019, 11:15:08 PM »
Help required re camshaft and primary chains.
Started checking out the engine parts prior to a re-build for the cafe racer project, chains for stretch, crank clearances etc. The only reference I can find regarding primary chain stretch is on youtube by "hackaweek" who states that the measurement from the sump flange to the primary tensioner should be no more than 70mm. Mine is measuring 68.5mm, is this O.K ? or time for new chains ?
Regarding the camshaft, I have an R1 which is totally shot. It has four totally different sizes of journals and one of the cam towers has had bronze bushed fitted. I got a set of decent cam towers from Mick some time ago and now need a camshaft. Am I correct in saying that practically any camshaft will fit ?
Any help and advice would be greatly appreciated.
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« on: September 13, 2012, 11:16:35 PM »
Having taken about half an hour to get the engine out of the F2 frame ( and all there was was the engine and frame ) together with a lot of cursing, I decided what I needed was a "Gordons Frame Kit" to get the bugger back in when re-building the bike. It also means that I can re-build the engine in stages, rather than one big lump. Had a look at the photo's of the kit and thought shurely you can do it easier. Here's what I came up with.Made 8 top hats out of 25mm bright steel tapped m12 down the centre.  12mm stainless threaded bar, nuts and washers. Frame cut and inner seam filed off. Top hats fitted. Assembled, ready for welding.
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« on: August 07, 2012, 06:59:31 PM »
Can someone help me out regarding the F2 head gasket. I E-mailed David Silver spares to say that the gasket set for the F2 and F1 were the same part number on their website but the F2 has oval fire rings and not round as the F1. The answer I got was that the F2 was no longer available and everyone fits the F1. Surely the F2 head gasket is so designed to take into account that it has larger valves. What do the F2 owners fit cos I can't find the correct gasket. Cruzinimage don't do it and Paul Miller Motorcycles in the USA don't list it. What to do ? Any advice would be appreciated.
Archmill
6
« on: July 02, 2012, 12:18:33 PM »
Got a good crank and main bearing shells from Mick (good man, many thanks) but the shells don't have any colour coding on them at all that I can find. Fitted them into the crankcases with the crank, using plastiguage and torqued everything up. All the oil clearances are exactly 2 thou but according to the Haynes manual I should be looking for 0.8 - 1.6 thou (20 - 41 microns) with green shells ( crankcases all B's, crank all A's). I'm worried that having the larger oil clearance on the main bearings won't build up enough oil pressure to feed the rockers and although I have been told by an experienced engineer I should be looking for 2 thou, I would obviously want to get it right before re-building the engine. Am I being too pernikety and looking for a problem that does not exist ? Any thoughts would be gratefully received.
Archmill
7
« on: April 17, 2012, 12:14:40 AM »
Have now stripped the engine completely. It's been rebuilt in its short life (16000 miles on the clock), registered in Sept. 1979 and the last tax disc July 1981. The LH cam carrier has bronze bushes fitted which I have been told was never a factory fit, four of the rockers have been dressed with a stone and there's no chrome on them. There's a chip in one of the barrels, a lovely half moon impression on the top of one of the pistons (guess it was a valve head) and the cranks on its last legs. Here's a photo of the oil pump filtre. That ain't right, is it? LOL. Anyway, I am looking for a crank or is there some way to reclaim the original?
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« on: February 09, 2012, 09:51:53 PM »
There is an E-petition on the go just now to restore the 30 year old vehicle road tax exemption. If the number of people who sign the petition reaches a certain number (100,000 I was told), it must be raised in Parliament. The jist of it is that at one time, any vehicle (car or motorcycle) over 30 years old did not pay any road tax. This was frozen 10 years ago so any vehicle to be tax free has now to be pre 1972 and as the petition states, history did not stop in 2002. If the Government unfroze this exemption, all bikes would be tax free when they are 30 years old. Right now, that would be all machines registered in 1982 or older and it would be ongoing each year. Copy this link into your search engine to sign up. It only takes a couple of minutes. http://epetitions.direct.gov.uk/petitions/183
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« on: February 06, 2012, 09:11:03 PM »
What exactly do I have?
Frame No. CB750G - 1005503
Engine No. B750GE - 1004749
The only ref I can find that coincides with these numbers is the CSMNL site that quotes it as a CB750 F2 Supersport (England) but everywhere else I look quotes the F2 as frame number from 210001 and engine number from 2600004.
Is there such a model as an F3.
The bike is a 'T' registration which ran from 1st Aug 78 to 31st July 79 and was first registered on 18th June 79. The tax disc on the bike ran out on 30th Sept 81 so it appears to have been on the road for only about 2 years. It's only got 16000 on the clock.
Any ideas?
Archmill
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« on: February 05, 2012, 02:47:24 PM »
Hi from Motherwell, just joined the forum today.
A couple of years ago, I picked up 3 bikes from a friend of a workmate who stuck them in his garden shed in 1985 and never took them out again.
A 1984 Honda VF500 F2 with a genuine 5000 miles on the clock which I have restored ( made 9 pages in issue 3 of "Practical sportsbikes".
A 1978 "T" reg CB750 Super Sport with 16000 miles on it and in not bad nick, and a Suzuki 400 which I wouldn't use as a door stop so I gave it away.
I am now starting a full "nut and bolt" restoration of the CB750 and having never owned one, I have a million and one questions to ask so I look forward to talking to you guy's for some expert advice.
All the best
Archmill
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