Its going to be a dual coil, point ignition. first off, check your Kill switch with an ohm meter, if it broken, disconnect. check ignition switch in the same manner.
If there is no improvement, you will have to pull the stator and point assembly. I just finished working on a 1973 Colt SS294 that had no spark. the sled sat for about 4-6 yrs and the points literally seized up, which you can either repair or replace the entire stator.
Polaris used the same stator all the way up to 79-80. So ignition parts are still easy to get.
Do yourself a favor first, either BUY a manual or see if you can get one from your local library. there will also be a few special tools you will be needing to get this job done correctly. a Fly wheel puller is a MUST, you wont get that fly wheel off without one.
as is a Volt/OHM meter. electrical is usually your biggest issue with these yr machines.
'97 Indy XLT limited - Sweet sled
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'86 Indy 400 - Not Stock - FOR SALE - $800
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'86 Indy Trail - FOR SALE - $400 good beater sled!!!!
'85 Indy 400 - "WE WILL REBUILD IT!"
'79 Polaris Gemini 250 (244 Twin)
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'73 Polaris Colt 294S/S (F/A) - FOR SALE $300