Honda-SOHC

Hi, I am new to the project board and have built too many bikes but, never put a build tread up 

I have a agreement with the lady of the house that, we can not buy anymore bikes but, no mention of building any 
I always read about how much these bikes cost to build and I know from first hand experience that they are not getting cheaper so, I have set myself a challenge to build one for less than £1000. Not sure if this is possible but, we will try.

Have got hold of a 500 four frame and have been donated a 550 engine, 500 hubs, 550 forks, 550 carbs, 550F1 tank ( thank you to all the members that have donated) and will be using parts from my stash that will need refurbing.

I will not be using any CAD or special tech stuff, it will be a tape measure, Vernier and cutting out bits of carboard to make templates.
I will not be using pods, clip on bars or any hi-tech electrics. 

I have stripped down the engine that was donated by a member who got it off another member and had been fully rebuilt using youtube vids  . The engine had about £500 of new parts fitted but, the builder had used silicone which had blocked the oil ways and destroyed the crank. But, a few £££ goodies can be reused like, the primary chain.

Today i started chopping the frame and putting a hoop on and trying a few parts out.



[ Guests cannot view attachments ]



 

I am finding so many of these broken or worn out that I decided it was time to have some made. More info later when anyone can work out what part it is 


[ Guests cannot view attachments ]

Bought this 2015 from a guy how's father had passed away and left in a coal shed. Have been doing this in my very limited spare time.


[ Guests cannot view attachments ]


[ Guests cannot view attachments ]


[ Guests cannot view attachments ]

Over the top P&P but, that is life  >>>> https://www.ebay.co.uk/itm/Honda-CB-400-F-four-Horn-horn/273745861282

https://www.youtube.com/watch?v=LryZBRcz4NA

These are both UK K6 cases,first clue 2468164 has a M6 top bolt and 2468581 has a M8 top bolt. How many other differences can you spot  on cases only 417 apart 

[ Guests cannot view attachments ]


[ Guests cannot view attachments ]

CB750 head gaskets have always been a problem on the early engines and i have always got round this with upgraded 0'rings.
Today i was asked a question by a old time engineer that set me thinking. Why has no one ever done a copper head gasket for a CB750 ?
The most important part of any head gasket is the fire ring. The next is the sealing of any oil ways so, does anyone have any views on why a copper head gasket with insert 0'rings would or would not work ?