Honda-SOHC

If they are old Champion plugs they'll most likely be imperial size, so not metric. Try and find a suitable long reach socket to get them out. Be careful as they may have been in there a long time, be especially careful with cylinder 3 as it has the tacho drive right above it and breaking that will be a major problem as they are very hard to find these days.

Couple of more things to think about.

If you intend to keep the bike think about these.

At some point changing the carbs to the CB500/550F type. Much more reliable and a LOT less problematic than the PD carbs currently fitted.
Consider fitting a second disc to the front, looks more balanced and gives better braking. It would also mean replacing the tired looking master cylinder which TBH kinda spoils the look of the bike ATM.
As you can see areas like the inner cups of the tacho/speedo rust and you can't see it happening. Especially true of the inner parts of the fork ears and underneath the rear mudguard to name just a few, protect these areas with some sort of rust proofing. I use Zinc paint and it works just great, other solutions are available like underseal for instance. The price of replacement parts is going higher and higher each year and some are very hard to source now so try and protect what you've got is a good idea.
The colour of the header pipes indicate a ignition problem at some point, could be mixture is too weak or timing is wrong. Check timing etc. Don't assume because the dealer said it had been done that they actually knew what they were doing, won't cost anything and will give you some idea of working on the bike for the future.

I seem to have everything but that line! Sorry!

Al

Quote from: Wenman on April 05, 2020, 02:15:48 PM

I might have an original! I’ll have a look on a sec!

Al

Your forks look good SPR. What did you use to clean them up. Mine look like the before pictures.

Decal off E-Bay?

If so can you let me know how it fits and looks.

Couple of tips which could avoid some real heartache later.

Buy yourself some JIS screwdrivers, they'll pay for themselves in no time.

Remove the screws holding the idiot panel on when you get some JIS tools. Blob them with a drop of vaseline or grease on the threads and very carefully refit them, DO NOT overtighten these or you will split the plastic if it's not already split. Same goes for the switchgear screws, bit of grease etc now will avoid some real struggles later on.

The idiot panel decal is available on E-Bay, will look much better fitted.