Honda-SOHC

Just rebuilding my 500 K0 1971 (USA model)and have come across an electrical problem.

On the bike currently there is a brass small pipe coming off the top of the oil pump which is connected eventually in to a small diameter plastic tube that leads along with two wires to the front of the bike.

The tube and the wires have been snipped off by someone so I am unclear what happens here. I assume the small pipe went in to a pressure switch somehwhere but I can't see a switch anywhere. I further assume the two wires went originally to the oil pressure light on the "idiot" display.

I am now however even further confused as I can't see anything resembling this on the Honda parts list, what I do see however is an oil pressure switch mounted on the oil pump where my current small bore brass pipe connection goes.

As always I am sure there is a simple explanation and hope a fellow owner can shed some light on what I need to do. Obviously haveing a functional oil pressure light is kind of important!!!!

Look forward to the replies

Thanks all - ordered a set from the ebay Italy site, 60 Euros (about £43) delivered to UK.

About 1/2 the priec of David Silver set that comes to £78 without carriage so I guess aruond £85 all in. (albeit that does include bolts but £40 for a few bolts is a bit steep  )

Let you know what the quality is like

 

Does anyone have a set of mounting brackets for the original 4 exhaust system spare they would be willing to sell?

Just on my final stage of engine rebuild and about to put back Cam but I have some confusion/questions around how all this works. This is really about satisfying my curiosity more than anythinig else............

So you line up the 1.4 timing mark so pistons 1 and 4 are at TDC and then line up the marks on the cam - I get all that but this got me thinking -- cos as an engineer I like to understand how all this works so here's my confusion.

Lets say Pots 1 and 4 fire at TDC , crank then  rotates 180 on the bang stroke, then rotates another 180 on the exhaust stroke and 1 and 4 then get to TDC again at the end of the exhaust stroke. Now surely the 1 an4 points will open again and fire the plug again. I would have thought the crank needed to rotate 360 before firing 1 and 4 again.

Clearly I am missing something obvious here or dooes it fire again at the top of the exhaust stroke.

Looking forward to demystifying this !!!

I am a bit mystified 

Thanks
Probably a stupid question but i note the Roadrider is shown as a tubeless tyre do you have to fit tubes anyway on the honda rims

I will soon be looking to apply for an age related registration form my 1971 500 Four K0 that was imported from USA in 2015.

I have all the correct Nova paperwork etc but may be struggling struggling to get a proof of age document that DVLA will accept

. I contacted Honda in the USA who sent me the attached but DVLA said they need to know both Year AND Month of manufacture but the person I had on teh phone was pertty clueless.

Does anyone by any chance know if the attached would be acceptable as proof of age documentation, Honda USA are saying this is all they can provide.

Thanks all