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25 Jun 2015
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Join Date: Jun 2008
Location: yorkshire england
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resister caps
hi there guys im having some ignition problems with my 1985 43f , i think its the ignition switch so going to get a new one, while checking things the plug is a NGK DPR8EA-9 but the NGK plug cap has no markings to say it is a resister cap will check this with a ohms meter , do i need a resister cap and a resister plug , each has 5k ohms (5000) so both would be 10,000 ohms . so is 5k ohms ok or do i need 10k . from what i know the more ohms resistance the weaker the spark , but i have just fitted a new aftermarket cdi to a suzuki gsf 400 bandit and the leaflet seid both cap and plug MUST be supressed to protect the cdi . your views on the matter guys , the plug cap i dont think is my ignition problem but am going to fit a new one . zigzag
Last edited by zigzag; 25 Jun 2015 at 16:15.
Reason: extra word
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25 Jun 2015
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Hi zigzag.
I bought an ngk plug cap with 5k resistance. I didnt realise it at the the time it was 5k .( The original on mine was 10.5k)I fitted it and it did work. (Started and ran okay) i didnt leave it on though as it wasnt the cause of my problems so i refitted the oem one. I should say mine is a 4pt 2003 model
Bill
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25 Jun 2015
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I always understood either cap or plug (or leads) but not both, and certainly not all three. I stand to be corrected but put resister plugs in one of my bikes with resister caps and it misfires to the point where it hardly runs.
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26 Jun 2015
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hi guys ive measuered the old cap and strangly got 5800 ohms although its a 5k cap . i had a new one in my xt box of bits this one is 4800 not 5k so i fitted this so will see how things go , like i seid the cap is not part of my running problems but a new one can only help , thanks for your comments guys zigzag
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28 Jul 2015
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"lectric!"
resistance in series is additive, E or volts divided by Resistance equals Amps.
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29 Jul 2015
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without getting too deep into physics, lets just say that coil/resistance circuits behave diferently than a plain resitance circuit.... apples and oranges really, I=V/R applies only to a degree... voltage rise and spark duration (time wise) are much more improtant than absolute current.
in more practical terms, modern systems are designed to run 10-15K ohms resistance, i.e. R plugs + 5-10k ohm caps.
there's a good chance to get more misfries form running with 0 ohns caps rather than 5-10K, as spark duration gets shorter, so more hit and miss ign.
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