Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
wow Brian, great site, shall order today. My ignition has been a bit unreliable lately, no.3 keeps cutting out. Replaced coils which were always bad in the wet. Now with these plugs should all be good. Thanks to both of you for great advice.Steve
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.
hmm, D7ES out of stock but they do have D7EA. Does anyone know the difference?
I feel these combustion chambers were researched and developed to use resisted ignition system. It's often just referenced to radio interference, but it changes the length of spark which is intrinsic to combustion chamber design.