Coils Compatability

[wdavie]

Hi folks just a quick question are the 750 soils compatable with the 850 engine. Cheers Wayne

[almarconi]

I would think that they would be compatible as long as the years are similar. If the bike has points you want a 5 ohm coil, inductive would use 3 ohm coils.

[trippivot]

all 4 cycle TPI-BPI step up coils interchange

2 small wire connections primary side 2~5 ohm

2 big wires to spark plugs seondary 15K~25K ohm resistor caps/resistor spark plugs optional



transistorized pointless ignition
battery point ignition

there are exceptions but yes what you have described will interchange.

[trippivot]

I would think that they would be compatible as long as the years are similar. If the bike has points you want a 5 ohm coil, inductive would use 3 ohm coils.

if the bike has points you want to restrict primary voltage to 9 volts as to not burn the mechanical point pads.

that is the biggest reason to do the coil mod when changing points system to a dyna or suzuki TPI electronic ignition