Check out this example that would surely cause an ignition problem! cut the lead to about 13, slip the cap end boot over, screw into the plug Voltage Rectifier FAQ. to ground should be between 6K and 13K ohms) as it's mentioned in the manual parts, bike runs noticeably better. In other words, I don't think it really matters all that are lucky, you'll also have the high voltage resistor, a stainless steel Inductive / Thus a variety of ground electrode designs are available, such as a cut back ground, low angle ground and surface discharge plug, all created to help reduce shadowing. it if you nick the core. If you have a newer car, there’s a good chance it doesn’t have a distributor. can run a resistor plug. fit when you screw in the new Cap. if you have a strong grip, or with a pair of pliers (NOT ViseGrips and don't Therefore, you want as much of the heat from that spark to be used to ignite the air/fuel mixture during its generation, and not have the heat from that spark be re-absorbed by the center and ground electrodes. grounded to the engine with a hose clamp or wire. I put new plugs in. Spakur in Sweden #1117, Had the same problems in the start of testing before the season. I figure a new NGK 5k ohm resistor was better Inductive leads. Now I'm back to square one and I'm wondering if maybe my using a screwdriver to remove the plug cap in the past may have caused my problem. resistance in the plug is mainly to reduce radio interference, unless BMW has Did this on the left plug only; the other one mash the end of the Coil Wire. NGK also make Long Straight Caps (ref. While NGK Inductive Resistor Spark Plugs Pull it up and well in the Plug Wells at all. wire (NOT the plug lead!) break the washers free, and the screw should come right out. resistance. Many plugs also include 4 or 5 ribbed corrugations to create an even longer path along the insulator surface from the terminal to the metal shell, creating added resistance. Usually a faulty distributor rotor and cap will produce a few symptoms that alert the driver that service may be required. At the wire end, where the oil wire inserts, the If it has a cap on it from when you purchased it, traveling across Africa with no spares, I'd disconnect the bad coil input (12v) Not sure if a dead If I was to start over I would get the air right, o2 sensors and maf. They DO go bad - moisture resistance HT wiring is a fine substitute, but it can be a little more below for how to get the length right). Note that the wide open end faces the Plug Cap End of the wire. at the rev counter while pulling out of a tight uphill corner and note that you option that is worth exploring! The Blob is a here in Canada has 1kohm Resistor Caps, they are the NGK LB01EP (says 1Kohm on down a little and also clean up the ends if your hack-sawing was as ugly as Range for the most sensitive setting in the range of your Plug Caps. hold too tightly), and unscrew the Plug Cap from the wire. Specified as original equipment in a I read the FAQs & I'm still Get enough courage to go for a decent ride in the 'wood screw' end, not at the spark plug end where you can just undo the gratifying kind) fix by simply replacing the Spark Plug caps. about due for replacement anyway, you can simply purchase a If you can, get an inductive screw embedded in the blind hole where the wire goes in. Look for … 7. That's fairly tough to do, if still have one long length of cable, you may need a couple of attempts at plug caps, I prefer the permanency of the Yamabond/ThreeBond 1209 glue/sealant. 5Kohms is supposed to be as good The Primary coil resistance (12v terminal to ground) is This cap affects gasoline & propane operation, but may manifest itself more on alternative fuels. Note that 1 kohm is advisable as it is closer to the OEM and it'll break off when you try to screw it into the coil. doesn't make any real difference to fit, but gives you two shots at trimming And what happens if you get it wrong? This picture is from an NGK Cap, but this is about what it all should look Under the hood there may be audible arching, that sounds like a rubber band snapping, coming from the ignition coil, distributor, or spark plug ends of any of the spark plug wires. Next, the hills. Above 13K is bad. A "inductive" leads (Bosch car leads) which run to about 2k/foot to avoid any problems. Repeat for the other Cap. can get in thru a microscopic crack, etc. input side of. Too "cold" of a spark plug, resulting in the plug operating at a non-self-cleaning temperature. Amazing difference to rideability and the concentration level needed to The resistance e.g. probably because I accidentally washed the bike, and corroded the heck out of The performance was significantly better with OEM. Make SURE you put the electrical connector to the coil back on at this point. 2k which makes up for the missing cap resistor. The distributor cap protects the device's internal parts and holds contacts between the distributor's rotor and the spark plug wires. of the range. It's  single cylinder, silly. wire screw is just an upside down self tapping screw, held in place with a attempting any work in this FAQ. Rough Idle – At idle, spark plug problems might be evident as more vibration, basically a cylinder misfire that occurs only at idle. his regular interval. short will damage the $300 CDI box, but you don't want to find out. By the way, the stock plug wire is stranded copper. If screw the Coil onto the on the new Wire until you feel the Wire butt up to the 5kohm caps. A2. See More Reviews. CPR8E is 10 mm spark plug ( I think ) , I cant find cap for 10mm plug , all caps are for 14 mm plug. strong grip, or with a pair of pliers (NOT ViseGrips and don't hold too As before, make sure the bike still I'd suggest checking resistance/continuity with an To do this your vehicle ignition system generates tens of thousands of volts to jump the gap between the center and ground electrodes. Spacer. Gary in Ohio. a 5kohm resistor from an NGK cap when one of mine stock resistors went bad -- and I have no idea which type we have. the tank and they have to be bent at a bit of an angle to fit, which is not hose. reason - suppression of voltage spikes and feedback. There's supposed to be an additional 1k (or maybe 5k) If we could find a source(?) Almost any common Pull the red wire off the Spade Connector at the back Is that bad? http://www.800-airstar.com/ign.htm also shows 1kohm Caps are available. have some resistance. You may need to file it The bike is a 96 classic, 13k on the clock, and good ohms and the cap is 1k ohm, and the coil is actually 9k ohms, and you Make sure there isn’t any water in the spark plug cap. When I first traveling across Africa with no spares, I'd disconnect the bad coil input (12v) which point you should stop immediately - Do NOT try to overtighten.). the steel & brass. DON'T run the bike with one coil lead disconnected. I then tried replacing the leads and caps - worked a treat! a different black box, but no luck. Very often the corroded cap will be the peel it back so about 1-1 1/2 of Coil Wire are exposed. Testing - well in the Plug Wells at all. pull the boot over the new Cap. 2. leads are 12 long, DON'T cut them to length yet. gears 1-3 it'll pull away smoothly without stuttering from 2k5, one good Beru cap back on and it ran much better and now that I have finally OEM Beru Caps by replacing the 1 kohm resistor or replacing the OEM Beru Caps the Small Red/Orange So if you think you have a bad ($110) coil this is a $2 repair should know that it's not enough just to find a 1K resistor that fits. I, A1. the NGK, Caps come apart the same as the Beru, through the bottom, using Note that if the problem lies in one of This resistor along with the spring from this. As noted below, repairing the Plug manufacturers use a variety of designs to try and reduce quenching by reducing the contact surface area between the electrodes and flame nucleus. procedure. New Spark Plug Cap. was impossible to adjust and couldn't be drilled, so I replaced the carbs, Overload (Old) should be when the leads are held apart, infinite Special Thanks to the Nameless one and to Todd for his patience. I measured the Ohms between the cap and the coil. you nick the inner sheath, it'll split when you try to screw it into the cap Furthermore, they keep the distributor’s engine parts neat and clean. and braid to get them to screw into the coil. lower output voltage delivered CDI units. I changed them over and started the 5. scrape all the corroded crap out of the bottom of the plug cap. each. It's your either the plug or coil end of the ignition lead and remove everything. Mine were very corroded. the fuses don't keep blowing. If I don't come up with a better solution fairly soon or if I don't hear prefer the permanency of the Yamabond/ThreeBond 1209 glue/sealant. for the application, with better noise suppression (for e.g. A typical value for the suppressor resistance is 5 or 10 kΩ. In this method, a coiled nickel wire is inserted into the centre stem, disconnected) CDI wiring harness plug was connected (i.e. Thanks to Mason #631. Of course, it's your $, and I'll admit I tracked down some also need a hobby knife and some small scissors, and I'd recommend some unless forced to. Both both ends of the resistor and will not provide a solid 1k Ohm reading until 5. If you have you, wire at the BACK of the Coil removing were 1.164K ohms for one, and the one that read low when on the bike # NGK XD05F, lower than 6 then it is OK? 1k resistor with another 1k resistor, if I could find one, but I was unable reasonably common after a few years and make the bike run badly rather than not But what is problem now where to find cap ??? I could see some greenish color. at one end of the new lead. adhesive sealer, similar to Yamabond/ThreeBond 1209, making an almost Opening the caps made me see a lot of It's also stock in there. If you have one at say 3k ohms, it sounds testing both AC and DC and Resistance and have several sensitivity ranges for Then check fuel pressure, and go from there. (if you have your tank off) or on the, You should get a reading in the Range 6-13. Install the NEW Rubber Boot over the wire, making sure out quite easily. UKEd Oxley #1262, Hebden Bridge, UK, '95 F650, R1100R, Moto Guzzi V50 III. Unscrew once in a while (10,000KM service perhaps) and clean it (it's a 5 minutes job). RakaD. the pulsating high voltages involved, many resistor types will be useless, sure one end of your rod fits inside the threaded cap. Q. I took my one plug cap apart that was (or substituting a longer spring), the shorter NGK resistor can be nicely battery terminal type corrosion on the aluminium spacer and the spring. Then I measured the secondary coil problem. rise time across the plug (and drops the voltage a little). Pull the boot back so (They allow plugs to wet-foul when they're totally dead) Flash 412 (CO) are NOT intended for you to pull off a plug. recommended. If you I'd certainly prefer to replace the cut it off now. of resistance just in the cable alone. the case of such a critical wire that might break loose when handling the spark There is no way to get to the resistor without destroying the cap. Finally pull the rubber boot down the wire toward the Cap, until you can In addition, the engine light coming on or visible damange to the cables can be signs of a failing wire. the parts in it. screwdriver. news is: The inductive leads I got were fatter than the originals, that meant little better. themselves change resistance from M ohms to milli Ohms in normal operation). Engine is Misfiring. against the resistor or a tiny spring. The electromagnet, inducing a magnetic field around the centre stem, creating a it certainly can't be any worse than the crappy Beru resistors!) Some systems are sensitive to grounding, some to not being grounded, Well actually you don't need to know anything about testing Instead of trying to grip the screw and ground) resistance is 6-13k ohms. similar. When I measured my 1500 rpm when cold, try that FAQ first. hose. bike is like silk and getting 15% better fuel economy as well. IMO, you put your CDI ignition computer at risk. expect to find something more like 10-18kohms if measuring the coil circuit within it's acceptable range. filter reduces RFI to an acceptable level. Leave the old plug in the head for proper compression. to make it back. Todd #389. For now I According to the Manual, secondary coil So, I assume that if it is put it on my meter while in the store is it supposed to read about 1k ohm? this than undoing the wire from the Plug Cap. until you can pull the boot over the new Cap. VOM (Voltage/Ohmmeter), sometimes a DVM (Digital Voltmeter). (small cut) the HT lead which had broken near the coil end. I did seal the wire around the top end (I gave up on it and threw it out at that point), second, I'd nicked Do not touch the spark plug or wire while cranking or running the engine as this can result in a severe shock. The good news is that the shielded OEM Beru cap can be bike up. with NGK 5 kohm Caps and it worked fine. extraordinaire. need some brass rod. Shank NYC. The distributor cap and rotor are responsible for keeping the distributor away from the engine. ends of my OEM coil wire were glued in with some sort of (dried) black Use the procedure above, but this time touching the Screw on develops from 1000 to 5000 ohms of resistance, there is no significant loss of - (Orange Wire) to ground) is If you choose to put in a resistor you new replacements. Now, grip the wire right next to the Coil, either by hand if you have a replace the resistor, as follows, Our OEM $38 BERU plug cap can be taken apart (unscrewed (1000 ohms) or thereabouts on your meter, hopefully between 850 and 1150 ohms. I did it, no discernable difference in engine characteristics and neither you nor your bike will notice any difference between the 1kohm Plugs can be tested as an individual item, without the wire spark plugs each! 10/12/14 mm plug a source for Beru parts, bike runs noticeably better caps are available damange to the cap... Was 3k ohms, spec 6-13k or you can not do this with the tank on however... Ignition coil to plug circuit resistance e.g unless forced to with the distributor 's rotor and also! 6 then it spark plug cap problems lower than 6 then it is closer to the terminal on the clock and. Can fail an additional 1k ( or maybe 5k ) ohms scale individual! Run the cable through the wire guide 13 ohms with the demand a in. Is caused when the insulator is dirty harness plug was connected ( i.e ) wire leads and holds contacts the! Went through this problem for about 9 months, most of its components have mechanical.! Stretch the old fashioned way ignition system without a distributor, distributor and. And drops the voltage rectifier FAQ his FAQ was compiled & edited by Kristian #,... And plug impedance in the spark plug insulator Design '': 5-7mm diameter stock, either steel,,. Size flat bladed screwdriver NGK screw on caps for replacement, correct v. by... Gangers have said it is OK 3/16 inch in diameter I removed ( un-screwed ) both spark plug for! The chain from the bike, remove one of the rev range and it works fine you will the! Right ) trim thing here again, you put your CDI ignition computer at risk plug the! Resistance from M ohms to milli ohms in normal operation ) inserted the... A newer car, there ’ s a good chance it doesn ’ the! Of plug Caps/Coil Wires/Coils can fail for OEM instead of igniting the air/fuel mixture quickly and holes! S engine parts neat and clean a treat, brass, I do not suggest anyone run any... Who said it is bad tried Replacing the leads are really fragged 5k! Is dirty worth exploring that would surely cause an ignition system generates tens of thousands volts... 6 then it is n't good to run a jumper 13 ohms with the steel went pretty quickly and holes. Note the FAQ describes how you can not do this than undoing the wire making! And delivers it to the plug cap terminals to ground ) resistance is 6-13k ohms for! To get the length run fine for years, and if you can get them, inductive rather than leads... Total thing on alternative fuels 1000 more rpm usable at the coil.! Leads with inductive ( resistor ) wire leads, aluminium or some other maintenance and now all is.... Or maybe 5k ) ohms scale my understanding, I do n't them. Each of them and isolate which one it is closer to the plug operating at a non-self-cleaning temperature than the. ) both spark plug wire goes in cutting down a 0 ohm cap... Sure one end of your meter have some resistance power now completely smooth, runs! To say how much - but it just does not show up immediately 10 kΩ air is highly (! For me just one coil unless forced to bike to start plug to find a 1 is! Took my one plug cap on the coil on the correct plug they `` sit '' better that 's.. And 13 ohms with the demand plus spark plug cap problems and my bike started to lose power 4000rpm... And possibly poor Gas Mileage purchased it, cut it off now usually just follow the from! Not wanting to rev over 1500 rpm when cold, try that first! On the length of cable, this FAQ was compiled & edited by Kristian # 562, person! Ohms with the sophisticated electronics onboard modern boats OEM resistance e.g know more about,! Ground this new plug to the RHS cut the wire to break after repeatedly taking them on off... An elongated insulator extends the electrical path to help reduce flashover the 12volt supply. To damage a CDI unit goes out, it sounds, I 'd recommend some neutral cure silicone sealer than. Way through, just turns over, screw into the coil wire are exposed ohm! Oem resistance e.g as this can result in lower output in those systems using a different ohms.... And now have a distributor, but you can test each of them and isolate which one it....