I have measured this on two bikes, both MC18 (R5k and R6k) that were running fine, and have found that the resistance across the HT coil is about 3300 ohm, also the resistance across the plug cap is about 5000 ohm, giving a total of 8300 ohm.
For a slightly better explanation see note 1) here
[This post is pretty much a duplicate from here. But I thought it should be placed in this thread as well.]
As a recent NSR`r I've been going over my bike to check that everything is within spec. I came across this thread when reading up on coils. I got a little confused when reading Dave Etts post that the HT coils should read upwards of 18k while most who replied measured much lower. My LT sides both reads right at 0.3 and the HT sides are around 5.5k each.
I don't believe i have any ignition problems. My problem here in Texas is fuel. Best i can get is 93 with ethanol. Right now I'm in Virginia and running 93 no ethanol but that's only short term till I ship it back home to Texas. Bike runs great, but not perfect. Sure wish I could find a steady supply of 98 leaded without ethanol. Might play with next hotter plug when I get home.
I'm curious what the HRC coils measure in at. Also wondering if anyone has toyed around with Krober coils. I've got quite a few of these. They are 1 ohm on LT side and 11k on the HT side. Not sure how the pgm will respond to a higher LT impedance.
Many many years ago these were considered premium ignitions and copied by many firms, even HRC. So I might give them a go for fun assuming here is no risk to the pgm. Maybe best to swap in my stock pgm just in case so I don't risk my hrc 030 coded pgm. (Bike is mc28)
I am in Virginia to do some riding in the hills here. Of the three bikes I've been riding...the NSR is hands down the best.
hi ericandchi
i have a mc21 and into both ingnition coils i have connected a green/brown wire into the green terminal.
pm me if u want to know something else i will try to help you
Hi, I am so Glad to see these post regards coil issue, as I am having some doubt about my mc28 coil. Hope someone can advice me.
My mc28 is barely start up, as I check the plug coil for the first one the LT side show around 1.6 ohm and with HT side both have around 16k ohm. (One point with HT side and either side of LT )
The other one, the LT side show 0.5 ohm but with the HT side one point have reading but not the other.
Is my coil alright?
Is there any comparable coil in the market I can buy and replace them.
Thank you.
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