Coil Specs for 86 XJ700S

Hello,
Just wondering if anyone has the specs for testing the coil on 86 xj700s. Left side coil 1/4 seems dead and I want to test the coil but don't know what resistance specs I should be looking at. Any help would be appreciated. Both 1/4 are not firing so I assume its the coil but before I fire expensive parts canon at it I just wanted to do some investigating. Thoughts? Thanks

 

Checking Factory Coils:

Factory Yamaha coils need to "see" a total load resistance on the secondary side (the "going-to-the-plugs" side of the coil) of around 20-30K ohms (ohms being a measure of electrical resistance). Electrical resistance depends on a number of factors: wire size, type of material, length of material, ambient temperature, etc. etc. All readings are specified at 70-F.

In any case, all factory XJ coils and wires combined---BUT WITHOUT THE CAPS OR PLUGS ATTACHED---have the following primary and secondary resistance ranges:


For all XJ700 and XJ750-X models:

Primary (input from TCI): 2.7 ohms +/- 10%
= 2.43 ohms - 2.97 ohms acceptable range

Secondary (output to spark plugs): 12K ohms +/- 20%
= 9,600 ohms - 14,400 ohms acceptable range

 

Thanks!! Will check it out today with these values.

 

I checked the coil and the readings I was getting were all zeros...so I checked the one that was working and it also gave me zeros? Not sure what I am doing wrong. however I tried to swap coils connectors today to ensure that the signal wire is working to that side and it seems to initially be putting out spark but now it looks like none of my coils are working. I know my battery is soft...I wonder how voltage sensitive these older coils are in terms of creating a solid spark? Any advise would be greatly appreciated.

 

for the tci to fire battery has to be at 10 volts when motor is cranking over. battery fully charged is very important to firing the coils.

how are you testing coils?
primary is tested from the 2 small wires in the connector to harness (can be done from tci connector.
secondary is tested from end of plug wire to the other end of the second plug wire on coil .

200 ohm setting on meter for primary

20 k ohm setting for plug wires

make sure to take plug caps off of spark plug wires the caps unscrew from wire ends. if testing with caps on go to higher setting on meter