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CB750 / Re: Wow this is the real deal 1968 prototype CB750
« Last post by AshimotoK0 on May 15, 2024, 11:54:24 PM »
Quote from: K2-K6 on May 15, 2024, 11:36:48 PM

The notes say "only CB750" to use accelerator pump on carbs .... probably don't know about the F2 then, and also Keihin made  :)

Yes I though that too .. very complicated carbs too yet the 4 pre-production prototype bikes had 4x modified CL77 carbs sprayed with silver paint.
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CB750 / Re: Wow this is the real deal 1968 prototype CB750
« Last post by K2-K6 on May 15, 2024, 11:36:48 PM »
Very interesting Ash.

Makes sense that they took it there as soon as something tangible was available to show, what with history of them in USA Honda network asking for a multi cylinder engine to advance from the 450 twin as request from marketing position etc.

The notes say "only CB750" to use accelerator pump on carbs .... probably don't know about the F2 then, and also Keihin made  :)

Interesting about having a Hyvo primary chain on that one only too. Last development of this bottom end, going into RCB racer, went to gear primary drive with a idler intermediary gear to keep the gearbox rotation in same direction too.
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Project Board / Re: Mike's CB550 Project
« Last post by Laverda Dave on May 15, 2024, 11:09:04 PM »
Same method I've always used Ted. I use an old electricians screwdriver with a slight radius filled into the edges to prevent any digging in. I go very, very gently on the carbon followed by some wire wool and oil.
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CB750 / Re: Wow this is the real deal 1968 prototype CB750
« Last post by Laverda Dave on May 15, 2024, 11:02:18 PM »
Some amazing history and early engine photos in that article. Thanks for posting Ash, great read👍
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Misc / Open / Re: It's been a Shite yesr
« Last post by Laverda Dave on May 15, 2024, 10:49:56 PM »
Best wishes to you Bryan in what has undoubtedly been a very tough time. As stated in other posts, this forum really is the best place to let off a bit of steam, we are all life experienced and fully understand the crap life can throw at us. Hopefully all the bad news is now behind you. Thank you again for all the help and advice you have given not only to me but also to everyone else on the forum.
Hopefully the sun will shine on you all from now on.
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SOHC Singles & Twins / Re: CB360 Wiring question
« Last post by Craizeehair on May 15, 2024, 10:32:28 PM »
A quick question for those in the know please?

I’ve got the wiring harness back on the bike and all the electrical components are now connected again.

Does anyone know if this bike will have daytime running lights? When I got the bike, the headlight wouldn’t work on low beam. I’ve stripped and cleaned the switch gear and now the low beam works but the front two indicators come on with a permanent low light. I initially thought that I had got something wrong but a quick check looks ok. I don’t want to start chasing a problem that isn’t there. From what I can see online, it does seem as though they could be?
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Misc / Open / Re: It's been a Shite yesr
« Last post by philward on May 15, 2024, 10:31:21 PM »
A lot to deal with Bryañ, make sure you look after yourself

Sent from my moto g(50) using Tapatalk

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Out & About / Re: OUT AND ABOUT 2024
« Last post by Johnwebley on May 15, 2024, 10:10:46 PM »
Out at Cotswolds Biker night

Willersly, nr Broadway on the A44

Sun and fun

Good collection of sohc 4s

The 750 is for sale, £10k



Sent from my SM-A546E using Tapatalk

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CB500/550 / Re: NGK plugs for 500
« Last post by McCabe-Thiele (Ted) on May 15, 2024, 10:07:59 PM »
Quote from: Bryanj on May 15, 2024, 10:01:21 PM
Ted, if you can find any D7EV are the dogs doodads for the 500, it should have had newish D7EA in it when you got it, D7ES is the original and not available the A is same as S according to NGK. You should not be using the R type
So a resistor spark  plug when you have resistor plug caps does this cause a problem somehow ?
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CB750 / Re: Wow this is the real deal 1968 prototype CB750
« Last post by Bryanj on May 15, 2024, 10:06:05 PM »
There are a couple of diferent posts about that recently on the US forum Ash, what they say makes sense to me in that a running prototype would be there before a pre full production set sent out to tease the dealers but not sure about Honda leting that out of the factory first
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