Author Topic: R10 on 750 camshaft (Read 3976 times)

RupertB · « **on:** October 17, 2010, 02:34:19 pm »

Having found that the 1974 engine on my Foale framed 750 has 64mm pistons and thus comes out at 810cc, I find the cam has the figures R10 stamped on it - does anyone know if this indicates standard or otherwise? Or is there a serial number elsewhere that gives any clue?
Cheers all, awaiting your wisdom!

Big Jay · « **Reply #1 on:** October 17, 2010, 08:00:09 pm »

Is that number stamped in it, or cast into it?

MCRider · « **Reply #2 on:** October 17, 2010, 08:27:35 pm »

Generally the "R" numbers are Honda production numbers and indicate it's a stocker. It could be a stocker that was worked on (welded up and reground) if you're suspicious its a hot cam.

Otherwise its stock. (I think) Though I'm interested in what Big Jay has to say.

turboguzzi · « **Reply #3 on:** October 18, 2010, 12:46:30 pm »

would be lovely to see some pics of the frame...

RupertB · « **Reply #4 on:** October 18, 2010, 12:55:57 pm »

Ciao TurboGuzzi - provaro mandare qualche fotografia del telaio. E un po brutto in questo momento, ma in qualche mesi, chi sa?! Anche provaro mandare una fotografia di mi'amore - Un Guzzi Le Mans da 1977, che ha fatto meno di 8000km dopo sua partenza da Mandello. (Perche ha passato 23 anni quasi abandonatto in un capanno!
Dica caio al Duomo - mi piace molto Milano!

turboguzzi · « **Reply #5 on:** October 18, 2010, 01:43:24 pm »

complimenti per l'italiano rupert, come mai lo scrivi cosi bene?

in piu, ce l'ho una le mans III anche io!

ti saluto il duomo volentieri

try to set your camera to the lowest pic size possible, might be small enough to post directly. Questo tipo di cose e piu facile da spiegare in inglese...

TG

RupertB · « **Reply #6 on:** October 18, 2010, 02:24:49 pm »

OK folks - can't seem to upload any pics at the moment, but the R10 is (I think!) stamped round the cam (as it were, as opposed to along it) just to the No3 cylinder side of the sprocket. Definitely cast into it betweem the No1 and No2 lobe sets are the characters 'D' on one side and '2' on the other. Also the lobes look to have a very steep angle of closure on them - if it stops raining I can always go out to the garage to measure the height of the lobes if anyone reckons this will help. While I'm throwing imponderables up does anyone have any idea of the wheels (see pic next to my ID!) They look a bit like the GSX Suzuki wheels but don't cross over near the rim. They are stamped 'Made in Japan' and the rear ub is Honda though the front discs look like Brembo a la BMW.
I said this was a challenge didn't I?!
TG - answer to your question - University of Manchester Italian French and Linguistics 1978-83 (Includes 2 years Arabic - long story) plus loads of holidays in Italy.

Sam Green Racing · « **Reply #7 on:** October 18, 2010, 10:49:52 pm »

Welcome to the forum RupertB, are you related to PaddingtonB or are you just another TeddyB?

Have fun Tommy.

Sam.

http://www.tomratcliffe.co.uk/

RupertB · « **Reply #8 on:** October 19, 2010, 12:13:08 am »

Neither - my wife says I am more PainintheB. Especially since I got the CB750!

Sam Green Racing · « **Reply #9 on:** October 19, 2010, 01:27:06 am »

Quote from: RupertB on October 19, 2010, 12:13:08 am

Neither - my wife says I am more PainintheB. Especially since I got the CB750!

Untill the other thing beginning with "P" comes around......Pay day.

turboguzzi · « **Reply #10 on:** October 19, 2010, 04:22:42 am »

interesting background, you live up to the story about british policemen being the most educated out there.

got caught speeding on a superblackbird in 1999 on the way to london after getting off the ferry from france. They were extremely polite and being a foreigner, they let me off without a fine and added: dont forget to tell your co-nationals how nice we are

TG

RupertB · « **Reply #11 on:** October 19, 2010, 01:34:45 pm »

Good to hear - personally I think most of them are 'stronsi'! Well, a few...
Try this - free postage - your English is well up to it -
http://www.bookdepository.co.uk/book/9781848762169/Prisoners-Property-and-Prostitutes?b=-3&t=-21

RupertB · « **Reply #12 on:** October 20, 2010, 02:28:41 pm »

Finally found how to upload and how to do small file sizes - here's the R10 marking folks...

RupertB · « **Reply #13 on:** October 20, 2010, 02:41:34 pm »

TG - Here's the frame - even has a side stand. One of the loops that are (I suppose) meant to be rear footrest hangers has fallen off due to bad welding I guess. Don't think they are original anyway, so the other one will probably be cut off and the frame tidied up. Also planning on removing the battery tray with a view to mounting a battery in a seat hump, leaving the monoshock as exposed as possible - it is a central feature of the bike after all.

RupertB · « **Reply #14 on:** October 20, 2010, 02:43:17 pm »

and a swing arm that lives in a box...

Jerry Rxman Griffin aka MuthaF'er · « **Reply #15 on:** October 27, 2010, 12:02:02 pm »

OK Rupert, calipers in hand. Yoshimura Daytona cam purchased new in 1976 with 25,000 miles: 35.94mm and 35.40mm. I measured the edges to try to get a spot with less potential wear.

Contrary to a previous post, I'd disagree about the "R" numbers being Honda production numbers that indicate it as stock. My intrepretation is that it's a casting blank mould number and not necessarily indicating a Honda stock cam. Looks like not only did Honda use these but Yoshimura too as my Yoshi Daytona cam is a R9 but with "B" stamped on the timing mark end. Neither of my other 2 stock cams have any such stampings. My guess would be either Honda made these and Yoshi bought from them and ground them or better yet they both bought from the same supplier and ground the blank to their specs or perhaps the supplier both cast and ground to specs.

imabass · « **Reply #16 on:** November 02, 2010, 03:18:15 pm »

I have one of these at home. R10. Ill put some calipers on it and look for other markings.

imabass · « **Reply #17 on:** November 02, 2010, 04:13:05 pm »

Mine has 7.5mm I and 7mm exhaust.

RupertB · « **Reply #18 on:** November 02, 2010, 05:04:27 pm »

Here's a photo of one of the lobes if this helps judge the nature or origins of it - definitely not stock I'd say

imabass · « **Reply #19 on:** November 02, 2010, 05:44:28 pm »

I think it is. I have 2 "R1" and one "R10" cams on my bench. They are all that steap.

Old Scrambler · « **Reply #20 on:** November 04, 2010, 08:55:49 am »

I have 11 motors on my table(s) with stock cams..........all have casting numbers similar to those on this thread. Some have colored hand script in addition. If HONDA was to have a problem, they could issue a selective recall. Interesting that quality control was intense in the late '60s but HD did not hire staff for QC until the '90s.

News:

Author Topic: R10 on 750 camshaft (Read 3976 times)