Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: Piki on February 08, 2018, 12:40:18 PM

Title: 550 K3 spark plugs
Post by: Piki on February 08, 2018, 12:40:18 PM: Hello, I would like fit new spark plugs to my 550 K3, it is stayed on my garage about 2 years ago and I tink that is time to run again....what spark plugs without resistor is the better option for this model? I always have problems to start in cold ...............
Thank you.
Title: Re: 550 K3 spark plugs
Post by: Johnwebley on February 08, 2018, 01:20:42 PM: hello Piki,

if you fit R (resister) plugs,make sure your plug caps are NONE resister,

or,

5K resisiter caps ,and none R plugs,

if the caps are the ones fitted from new,maybe replace all of them.as the resister caps do burn out over time.
Title: Re: 550 K3 spark plugs
Post by: Piki on February 08, 2018, 01:54:09 PM: Hi there, yes you are right, I need spark plugs without R (resistor) do you know what model is the correct?
Title: Re: 550 K3 spark plugs
Post by: gordo on February 08, 2018, 03:09:51 PM: Ngk D7ea should do the job as has no resistor.
Title: Re: 550 K3 spark plugs
Post by: SteveW on February 08, 2018, 05:14:52 PM: Cheapest place for spark plugs is Euro Car parts.

Type in 408774560 in the search box at the top for D7EA plugs, they are £2.69 each and with one of their codes they always give out even cheaper.

Got 4 last week for £6.99
Title: Re: 550 K3 spark plugs
Post by: Piki on February 08, 2018, 09:19:21 PM: Thank you mates
Title: Re: 550 K3 spark plugs
Post by: Nurse Julie on February 08, 2018, 09:26:32 PM: Do they have Euro Car Parts in Espania Diego?.
Title: Re: 550 K3 spark plugs
Post by: Piki on February 08, 2018, 11:56:31 PM: Not Julie..... Spain is a shit about Japan Vintage Bikes, but I will buy it from Euro Car Parts and them send me or I could buy from a Spares Parts here in Madrid....tomorrow I will ask price and I will comparate both.
Best Regards.
Title: Re: 550 K3 spark plugs
Post by: Bryanj on February 09, 2018, 07:32:35 AM: I think the K3 used a different grade of plug as it runs lean, D8EA from memory but NGK do a good online catalogue
Title: Re: 550 K3 spark plugs
Post by: Piki on February 09, 2018, 08:26:36 AM: Quote from: Bryanj on February 09, 2018, 07:32:35 AM
I think the K3 used a different grade of plug as it runs lean, D8EA from memory but NGK do a good online catalogue

Yes Bryan, I think that you are right, D7EA is for 400 Four.....I think
Title: Re: 550 K3 spark plugs
Post by: gordo on February 09, 2018, 10:53:32 AM: Don't know how correct this is and I think ES plugs where replaced with EA.
http://oldmanhonda.com/MC/DataTable.html
Title: Re: 550 K3 spark plugs
Post by: deltarider on February 09, 2018, 11:29:16 AM: Best plug for all CB Fours is the somewhat later developped D8ES-L. The French CB500/550 handbook calls them autonettoyante (selfcleaning). I always had them, especially during long holiday rides in France, Italy, Greece and Spain. They're halfway the heatrange of the old D8ES and D7ES and so were safe in long Autobahn rides at maintained high speeds. It could well be that the D8EA is exactly the same plug with just an another name. I suppose so, because the D8ES-L was used in a long list of contemperary bikes. The '7' is more for break-in period and for those that never cruise above 5000 rpm.