Honda-SOHC

Thank you for that Trigger.  I'm almost certain that mine are in the correct way round then.

I can only positively remember that mine have the numbers not showing when fitted but I do think coincidentally they are correct as per your first picture.  Thank you.

It's a longish boring story about my bike but essentially I removed the jets, cleaned them and refitted them as they were but I am beginning to realise that just about everything has been messed about with in an effort to get it to run properly so they could have been wrong when I removed them.

It just seemed odd to me that the jet size is invisible unless you actually remove the jet.

Hey ho.  There will no doubt be another carburettor question coming from me in due course then!

Thank you for your prompt responses, I do appreciate it.

Brian.

Your main jet should be stamped 100 and your slow running jet 38. The 38 screws in and the 100 pushes in at the o ring end and then the black spring clip 

Thank you Trigger; yup you are right, I was mixing the sizes of the two up, I meant 100 for the main jet.  I shall try to keep up 

So can I ask, when the main jets are fitted in place correctly, should the end of the jet marked "100" be visible, or should that end be the one that's pushed into the carb body and the unmarked end be visible please?

As I see it, it is possible to fit them either way because there are two grooves; one for the O-ring and one for the spring clip.

There is a reason why I'm asking!

Thank you again.

Brian.

Hello Florence,

I bought my plugs a couple of weeks ago, and a set of plug caps, from here:- https://www.gsparkplug.com/

It was the best deal I could find, and they came in a couple of days.

I can definitely second Nurse Julie's comment above regarding not using resistor plugs and resistor plug caps together, it was one of the reasons why my CB550 ran so badly when I bought it.

What probably made mine worse still was that the resistance of the plug caps when checked on a multimeter (if you have access to one) was very high, they should be 5k ohms; two of mine were about 9k ohms and the other was 13.  It's a wonder really that there was any spark at all I guess.

New D7ES plugs and new caps, less than £20 all in, and ignition problems all sorted.

I hope this helps!

Brian.