the iridium plugs are "suppressing" plugs. It may or may not actually read 5k resistance when tested, but should be used with non-resistor type wires and caps, Just as you would use a resistor plug. However, from my what I've learned about them, you are going to want to use the high output replacement coil (mikesxs #17-6803), not the stock dual lead coil from the 80-84's with stock cdi, if you really want the extra 2 HP. Also make sure your charging system is in good working order.
Post by throtlsnapr on May 27, 2008 7:24:50 GMT -5
I figured on using the 6803 coil and run on atotal loss off well charged battery.(track bike)I assume this system wouldn,t draw down the battery any quicker than points?I have had no problems before but will be riding a 2 hour endurance.
The Hall sensor only uses 13 ma of current, so the current draw for the coil would be the major factor. The points coils are each 4 Ohms, but only one is on at a time for a 90 deg dwell angle ea, or a total of 180 degrees of camshaft rotation which is a 50% duty cycle. So, the current draw for the points system would be 12/4 = 3 X 50% = 1.5 Amps. If you start off with a fully charged 14AH battery, it will take about 9 hours for the battery voltage to drop to 10.5 volts.
MikesXS 16-6803 coil is a nominal 2.5 Ohms. The Universal Ignition System is a 180 deg equivalent Dwell angle system or 50% duty cycle as well, so the current draw for it would be:
12/2.5 = 4.8 X 50% = 2.4 Amps
If you start of with a 14AH battery it will take about 6 hours for the battery to drop to 10.5 volts.
In both cases the coil resistance increases with the heat, both from the coil itself and the engine heat. Mikes coil resistance will increase to 3 Ohms after the first hour of operation, so you will be good for more than 6 hours. The Hall effect sensor will work all the way down to 3 volts, so the failure mode will be a coil failure, probably at around 8 volts, which won't occur until well after the 6 hour discharge period and, of course, well past the time when you collect the trophy!
Last Edit: May 27, 2008 14:12:19 GMT -5 by pamcopete
I have no personal experience with iridium plugs. My earlier comments were in regard to a member who has developed a PM alternator that develops low voltage, so I suggested that his main concern was starting with a low or no battery setup (giant capacitor) and that in general, the more exotic plugs require a greater voltage to work properly.
My general recommendations for plugs and resistance are that you should have 5K min in each plug circuit obtained in one of three ways:
1. Non resistor plug, non resistor wire, 5K cap. 2. Non resistor plug, resistor wire. (10K), 0K cap 3. Resistor plug (5K), non resistor wire, 0K Cap
These reccomendations are for an electronic ign system, either the stock TCI or any after market electronic system.
Last Edit: May 31, 2008 8:28:59 GMT -5 by pamcopete
I've read through your post and can't find the answer but forgive me if it's in there somewhere. What's the maximum current capacity of the power transistor? Enough to drive a couple of COP coils from a gsxr or similar?
r80rt: :)This is a splendid write up, THANK YOU!!!!
Dec 26, 2015 16:54:05 GMT -5
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May 16, 2017 16:24:09 GMT -5
joshua: The regulator/rectifier unit I got from Mikes PMA has closer hole spacing than original. Are we supposed to mill the holes to fit?
Jun 7, 2017 19:25:58 GMT -5
joshua: My bad. I found the bracket they supplied to mount the rectifier/regulator... Uh oh. How is this meant to work? Which way is it meant to mount? Looks like I have to use some spacers or something. Good instructions would be nice.
Jun 7, 2017 22:09:52 GMT -5
craig8johnson: Not sure if this is the right spot or not but oh well...
Jul 11, 2017 18:04:15 GMT -5
craig8johnson: I'm checking the charging system. I'm afraid I might have fried the last battery. With the solid state regulator (after market) what should it be charging at. The book says, I think, 15 volts. I'm hitting 17 when revved. Is that too high?
Jul 11, 2017 18:06:19 GMT -5
gggGary: Yes 17 volts is too high, about 14 volts is max, sounds like you don't have the right regulator or it's wired wrong.
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trix13: Hey everyone! New to the forum and am fighting those gremlins!! New charging system, ignition switch, coil and fuse box. Resistance is higher than normal on the ignition pick up so I'm trying to find one. No such luck yet.
Aug 16, 2018 8:50:48 GMT -5
trix13: Also, even though all of my connections are clean, I cannot seem to find out why , when at higher rpms, I hit the signals and the rpms pulse with the signals...hahah. same with the brake light. I appreciate all input!!
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Apr 10, 2021 2:14:13 GMT -5
louisvan: trix13 - I had a problem with my 1975 SX650. When I got to highway speeds, the engine lost power. The problem was in the connectors. At a certain vibration and the wind pushing on the wiring loom, the connector lost continuity. A bad crimp to the wire.
May 20, 2021 1:19:09 GMT -5