ebay coils

I bought a set of ignition coils off ebay last week. I tested them with a multi tester and need
an opinion of the results. the resistance across the primary leads is 5.1 ohms and the resistance
across the secondary leads ( plug wires ) is 16k 0hms. So, will these work in my xj650 or 750

 

Primary resistance (if a true measurement) is way too high. Specified resistance for XJ-series models are as follows:

For all XJ models except XJ700, XJ750-X, and XJ900 models:

Primary (input from TCI): 2.5 ohms +/- 10%
= 2.25 ohms - 2.75 ohms acceptable range

Secondary (output to spark plugs): 11K ohms +/- 20%
= 8,800 ohms - 13,200 ohms acceptable range


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


For all XJ900RK, RL, N, FN, and F models:

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

Secondary (output to spark plugs): 13.2K ohms +/- 20%
= 10,560 ohms - 15,840 ohms acceptable range


For all XS1100 models:

Primary (input from TCI): 1.5 ohms +/- 10%
= 1.35 ohms -1.65 ohms acceptable range

Secondary (output to spark plugs): 15K ohms +/- 20%
= 12,000 ohms - 18,000 ohms acceptable range



Slightly higher primary resistance is okay (for instance, our hi-po coils for the XJ650/750 modles is 3.0 ohms) but once you start straying too far out......on either side of the specification......it can have bad results for the TCI, and too low or high of a resistance will negatively effect the output capacitors, and cause excessive heat build-up which is the mortal enemy of electronic components.