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Polaris: GEN 1 and older 1998 and older, all models in the Gen 1 Indy chassis and older chassis models
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  #1  
Old 03-09-2017, 08:41 PM
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Merlin Merlin is offline
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Default '96 Indy Lite Ignition Timing

Hello,

Looking through the service manual I have, it does not list the timing curve for the 340 engine.

Found specs. for a '99 Indy 340 on the 'net:

- 26.5 deg. @ 3000 RPM
- 15.5 deg. @ 7000 RPM

Anyone know if these specs. would work for the older engines?

Also, has anyone tried advancing the timing past stock specs. on these machines with any success?

CDI remapping?

Would like to improve throttle response if possible.


TIA,

Glen
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Old 03-09-2017, 10:06 PM
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My book only goes to the 1993 model.
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Old 03-09-2017, 11:01 PM
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Thanks VB!

Looks like the later 340s are more advanced at lower speed but slightly retarded at the top end.

I'll just have to check mine to see where it's at & go from there.
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Old 03-21-2017, 11:36 AM
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Maybe adapt a flat slide or install UFO inserts into the carb if you are just looking for throttle response.
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Old 03-21-2017, 12:45 PM
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Thanks for the info.

The flat slides would be ideal like TRS did with his 550s but I'll have to put a cap on the engine budget for now to make sure there are funds for the chassis / suspension / steering upgrades next year.

Have you used the UFOs in the 340 fan application before? The benefits sound fine on paper but like many of the mods. out there, are they actually worth it?




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Originally Posted by olymon View Post
Maybe adapt a flat slide or install UFO inserts into the carb if you are just looking for throttle response.
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Old 03-21-2017, 01:01 PM
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Well, it always helps if you read the manual..........in it's entirety. The timing specs. were there all along. In the battery section & not where I was expecting to find them but were there nonetheless. LOL


Anyway, the specs. for the '96 were the same as the '99.


Upon checking, the 340 was running 24.5 deg. BTDC @ 3000 RPM. So, I tweaked the stator plate a bit but not quite enough & only increased it to 25.5 BTDC.

I ended up dropping the pilots from 35 to 30 as well so I wanted to try that along with the increase in timing to see the effect on bottom end. Will likely bump it up a few more degrees next season pending satisfactory plug checks......

Ended up having "issues" with my sled the day we went to ride so we only got a small chance to test the Indy Lite but from what we could tell, the improvement was significant / noticeable. It was good thing the Indy was running better cause it had to pull my Pro back to the truck. LOL!



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