I am planning on doing a 12V single coil conversion on my Commando. I have a Boyer Mark IV with 5 ohm plug wires. I was looking at a 4.5 ohm coil and was wondering if I should still use the resistor plug wires and resistor plugs...
...BR8ES
The "P" is NGK code for "Projected" tip. The the engineers SPECIFIED this type plug for the Commando.Thanks for the advice Gents. Yes, I should have said 5k wires. The spark plugs I mentioned seemed to be ok and I have sets laying around the garage so I was using them up. I will try the other plugs you mentioned. Hopefully it works well?
Update! A friend offered me a 3ohm dual outlet coil….any issues running this coil with the mark-IV ?
My solution of choice - stock twin lead H-D coils are a dime a dozen around here, and have a primary resistance of 3.5 ohms.Update! A friend offered me a 3ohm dual outlet coil….any issues running this coil with the mark-IV ?
What is more important - form or functionality ? - with two coils there more electrical connectors which can make poor contact. If you have a perfect Commando, you would definitely want originality."All the H-D owners take them off and replace them with "High Performance" aftermarket ones - seems like a right of passage in H-D ownership..."
Another in the endless succession of unnecessary parts with highly successful marketing ploys. The only 'upgrade' resulting is the upgrade in the selling company's bank account.
FWIW, I've been using the stock-type dual ignition coils (from Old Britts) in my Commando since '06, when I removed the single coil and Boyer EI that were on the bike when I bought it. They have worked perfectly with the OEM ignition from '06-'08 and then the current Trispark which I installed in '08. To me, along with the Ham Can air filter, the dual coils are major part of the Commando "look." Obviously, that is totally a matter of personal taste and, as Captain Kirk once said, "There's no accounting for taste!"
Yes LAB but Boyer Brandsen still recommends it and considering the common problems with this ignition personally I would do it.The Boyer MkIV doesn't actually need resistor caps, plugs or wires as it isn't a digital ignition.
"Why Do I Need To Use Suppressed Plug Caps?
MKIII and MKIV do not require suppressed plug caps for operation although we recommend using supressed 5000 ohm plug caps. Micro Digital and Micro Power units must be fitted with supressed plug caps. Plug caps fitted with suppression resistors are usually fitted to prevent radio interference. Radio interference (noise) can cause more complex electronic circuits like radios and computers to malfunction.
Our Micro Digital and Micro Power ignition systems contain a small computer operating at high speed that can be adversely affected by radio frequency interference. Symptoms can range from refusal to start to intermittent engine stalling symptoms. Use of non-suppressed plug caps has been known to cause permanent damage to the ignition unit."
The standard plug for a Commando is BP7ES or resistor is BPR7ES.
Yes LAB but Boyer Brandsen still recommends it and considering the common problems with this ignition personally I would do it.
Je respecte toujours vos critiques LAB mais Boyer Brandsen dit « pas nécessairement l’allumage » aussi pour moi nous sommes sûrs de rien. Bonsoir Françis
Yes, because "everyone" knows that you absolutely need a 60,000 volt ignition coil on an engine with a 5,200 RPM redline!snipped
All the H-D owners take them off and replace them with "High Performance" aftermarket ones - seems like a right of passage in H-D ownership...