SOHC.co.uk Forums > CB500/550
Plug caps and plugs
K2-K6:
"Easy enough. Just talk to the mechanics on the floor, that have opened multiple engines to find excessive carbon build up. There's your "very demanding and precise science supported by extensive (all motor manufacturing over many years) that's concise, repeatable and highly accurate form of motive power. " We're talking engines from the early 70s with an efficiency of 20% at best. For the remaining 80% they're stoves. Furthermore... you can study lightning till you're blue in the face, but every stroke will be different and cannot be repeated with identical results. Visit Teylers Museum in Haarlem. They have the biggest Wimshurst machine in the world. That spectacle will enlighten you no end. BTW, what goes on in lightning is still subject of studies. One of the more recent findings is that small particles from outer space play a crucial role."
That's an assessment of the system delivered and not the capability of using petroleum as a fuel. Again, burning this fuel is very precise, depends if there is a competent system to carry that out.
K2-K6:
I'll put it simply, there's no observable facts or supporting documentary publication that is contrary to Honda original advice that it doesnt require any changes to set up to run in either specification.
If it exists, then show us and we can all believe in what is written there, by Honda Japan that alters the view in any way.
deltarider:
So far - and I have kept record - the various European fora suggest an OEM standard suppression of around 6,5kΩ. Not only matches it my own findings, but it is consistent with Honda France's advice to replace caps once they read > 8kΩ. What legislation in other markets require(d)? I have no idea. Can these engines run with a 11,5kΩ (that's a 23kΩ in one circuit!) resistance? No doubt, when everything is new, why not?
What I'm very much against, is folks attributing some - sofar unknown - benificial effect, without anything to substantiate this, let alone to deliver proof. Then - so, it seems - it comes down to who said it. Sorry, but the rules are for everyone the same. When somebody is right, say 80% of the time, people should still feel free to criticise where that person is wrong. In the international forum only a few do this and I don't need more than five fingers to count them...
Sesman:
News flash.
According to Greenspark the NGK D7ES are now obsolete and will not be taking on any more stock.
deltarider:
The D7ES was not a very good sparkplug. Either turn to D7EA or the sparkplug widely used by riders in Holland: D8ES-L Back then a '7' was for break-in period only or if your riding was mostly < 5000 rpm. After break-in and even more for long hauls, especially at maintained high speeds on Autostrada and Autobahns, many turned to the latter, which was also advised by my dealer who owned a CB500 himself.
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