Topic: Coil Choices

[revjim]

I have a 750sohc 74 engine.  I have coils that I think would run a cb750  they are these   http://i252.photobucket.com/albums/hh19/revjimmc/DSC00873.jpg  http://i252.photobucket.com/albums/hh19/revjimmc/DSC00872.jpg

will these work for my engine?

[mystic_1]

What are they off of?


mystic_1

[revjim]

they are off of a cb650 I believe...maybe a cb550.

[c15racer]

forgive me if im being really stupid but how do you know if a coils suitable for the job?
Ive found a few twin output coils to replace mine but im really unsure on how i know if theyre ok?

ive just found the ones on this page about half way down......

http://www.norbsa02.freeuk.com/goffyelectrex.htm



12V coil with 2 outputs for twin cylinder machines, modern or classic. 3 Ohm impedance For points or electronic ignition.

The moulded in HT leads are 560MM (22 inches) long.

Body 70MM (with mountings 97MM) x 43MM
 
  These give the fattest blue spark you've ever seen £27.50 ea.
 
any good to replace my originals?

edit: ill get the new points and condensors in first and see what happens

[CBJoe]

I have a 750sohc 74 engine.  I have coils that I think would run a cb750  they are these   http://i252.photobucket.com/albums/hh19/revjimmc/DSC00873.jpg  http://i252.photobucket.com/albums/hh19/revjimmc/DSC00872.jpg

will these work for my engine?

Those aren't from a CB650 unless the '79's were different from '80 and later.

[222CT]

hey man whats up??  yeah i think those will work.....take an ohmmeter and measure the ohms on the connectors.  if you have points 5 or 3 ohms will work...if you have EI ignition....you need 3 ohms....but if i am wrong i am sure someone will say so.  i have a dyna s ignition and coils from a honda cbr 929 that are 3 ohm,  and she never ran better.  i had stock coils with the dyna and was having weak spark problems.  but that is another thread. 

[222CT]

come to think of it revjim....i looked more closely at your pictures....i think those coils are off a newer bike, those brackets are similar to the 3 ohm coils i got...i think they are 3 ohm, and will work with points or even better a EI ignition.   use those coils and upgrade later, but yeah i am pretty sure they will work. 

[CBJoe]

At least one of them looks like these..

http://cgi.ebay.com/ebaymotors/74-Honda-CB750-Ignition-Coils-FL703-12V_W0QQitemZ330204452774QQcmdZViewItem

Says they're from a 74 CB750.