Spark plug cap resistor...Anyone? - Wrist Twisters
Thread Tools Display Modes
post #1 of 2 Old 06-28-2012, 01:08 AM Thread Starter
What goes here?
Qex's Avatar
Join Date: May 2012
Location: The Springs
Posts: 27
Rep Power: 1
Spark plug cap resistor...Anyone?

I have the niner apart for some TLC. Just checked the valves (15645 miles and within spec as expected) and was reassembling. Decided to check the spark plug wires before putting the coils back on. Wires 2-4 plus plug caps were 5.14-5.23k ohms. No worries. Wire #1 was 4.33k ohms. That is approx. 17% off from the next closest. Decided to investigate. All 4 of the wires minus caps are 0 resistance. Perfect. Checked the caps. 2-4 are the same 5.14-5.23k ohms. #1 cap by itself was the off factor. Decided to take it apart. The resistor inside of the cap is the real culprit. Exact same resistance as the whole wire assembly. I realize this probably won't affect the bike performace much but has anybody experienced this? I am finding about 25 bucks for a new cap from several sources but all I need is that little resistor. I have read on some older bike forums that you don't need the reistor and can replace it with an aluminum or brass rod but I am not doing that on a modern bike. Any information for a source on these resistors would be great. They are unmarked and have no identifying numbers at all. I can buy the whole cap but because it it is just the reistor I would rather get just that.

'02 919 PCIII, Two Bros, Sargent, Ohlins, and some other stuff.
Qex is offline  
Sponsored Links
post #2 of 2 Old 06-28-2012, 07:44 AM
RichT's Avatar
Join Date: Jan 2010
Location: San Jose, CA
Posts: 188
Rep Power: 1
The resistance value of one wire/cap being somewhat different than the others isn't an issue. You won't see any difference in the operation if you get the value in the same range as the others.

How does that phrase go ? "if its not broke, don't fix it" ...

RichT is offline  

Quick Reply

Register Now

In order to be able to post messages on the Wrist Twisters forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

For the best viewing experience please update your browser to Google Chrome