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- Nov 11, 2013
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That is what i am saving my RITA AB11 for...knock wood.I’m using a TriSpark now, but would love to have a working RITA for when the TriSpark dies.
That is what i am saving my RITA AB11 for...knock wood.I’m using a TriSpark now, but would love to have a working RITA for when the TriSpark dies.
I do find the Boyers a bit confusing as there seems to be three current variants, but what are the differences ? Their website isn't clear.Boyer, under pressure from the Pazon not being so voltage sensitive, introduced the Boyer MK4, so its the Boyer MK3 that has the issues with advanced timing from low battery voltage. The MK4 does not but still has its foibles like the wires to the stator being vibration sensitive, the Pazon and its foible of the extended wake up sequence which makes it unsuitable for high compression singles.
what are the differences ?
Thanks L.A.B. , maybe I was unclear but what I meant was the operational differences. (or features) I.E. idle stabiliization, low battery starting etc. between the three types. They don't seem to have a comparison (that I can see).
"How Can I Tell What Ignition System Is Fitted On My Bike?
Look for the colour of the ignition unit and what type of coils you are running:
MKIII and MKIV - ignition boxes are black and run with the original coils or similar replacements
Micro Digital - ignition boxes are red (old style Micro Power ignitions were also red) and run with the original coils or similar replacements
Micro Power - ignition boxes are blue (old style Micro Power ignitions were red) and run with miniature specialist coils
ID units - positive units are red, negative units are black (these systems both have LED's positioned at the top of the unit)"
Aha, that's what I meant, thanks for that.To add to Les's input:
Micro MarkIII Ignition is the analogue system that most people that have a Boyer will have.
It likes 12 volts from the battery - less will give you starting problems, stuttering running, and kickback.
This was replaced by the Micro MarkIV Ignition a few years ago.
The look exactly the same - same stator plate, and same black box.
These will work down to 8 volts, and they have changed the ignition curve at very low RPMs making it easier to start.
The Micro Digital (red box) and Micro Power (blue box) systems are both digital, and both contain circuitry that will stabilise idling among other things.
- Boyer Bransden are insistent that suppressed plugs or caps are used on both these systems.
- It is important to note that the Micro Power (blue box) systems will not work with standard Lucas 17M6 (LU47275) or equivalent coils - you must use their COIL00008 unit instead.
Micro MarkIII Ignition is the analogue system that most people that have a Boyer will have.
It likes 12 volts from the battery - less will give you starting problems, stuttering running, and kickback.
So far you are only being told the "marketing garbage" about the products.
I can tell you what the actual technical characteristic differences are. The problem is few (very few) people will understand.
In the late '70s I used to repair the Rita boxes using a TV line switching power transistor! BU207 I think, but that is a long time ago.
Sure you were a hero too-but not a magician!
ADVANCE CURVES
I taught jr. college level for 7 years while in the USAF and the thought of trying to teach advance curve principles is quite depressing.
The 28 vs 31 degrees at 5000 discussion on this forum lets me know it is almost hopeless. Sorry I will not be typing a 3 semester hour college course.
Advance curve is the result of the process of correctly igniting the fuel air charge, which varies in pressure based on the throttle setting.
How the advance curve, if any exists, to compensate for the pre igniting of the fuel/air by a predetermined time to compensate for the quicker rotational period.
It is a time vs rotational speed, degrees/second, calculation process to control a spark generating device/subsystem .
Secondary more complicated systems, routine in cars, based on the amount of throttle will modify the ignition timing due to the change of combustion event duration.
The variable preignition physical position when properly done provides the best integrated/"average" pressure pulse push on the piston.