Another plug cap question

The patient in a 1983 Yamaha Seca 900
Its a project bike coming back from the dead.

I seem to have a spark problem.

The shop book says promaries on the copils should be 2 ohms but i measure 5.

If i unscrew the plug caps off the ends of the spark wires I get about 12000
ohms on each which is in specs.

Measuring the secondaries with the caps installed shows a momentary
17000 ohm and then infinite on the coil for 1 & 2.

This suggests a capacitor inside the plug cap ?

On the coil for 1 & 4, it looks like one of my plug caps is showing an open.

Is it possible to replace wires without replacing the coil ?
Are there really capacitors on the caps ?

Thanks in advance !

 

The resistance on the primary shoud be 2.7 ohms
&13.2k ohms on the secondary, if these are not within the + - they are toast. Some plug caps have resistors in them, which is fine as long as you don't use 'R' plugs.
Use should check your text before posting, "promaries on the copils" nearly split my stitches. :lol:

 

The Yamaha Coil Plastic case is formed around the two wires in an Injection Mold Process.
The wires are held-in place quite securely.
To remove the wires, ... you must remove a good deal of the Plastic Molded Casing and gain access to where the Wire connects to the Coil Output.

A DREMEL Tool and a Cutting Bit will get you in there.
Once exposed the wire will come free and can be withdrawn.
We call this process: "Coil Surgery"
Search: Coil Surgery

It looks like this when you get the Coil cut-away: