Author Topic: Polaris Ignition CDI & Coil on Invader.  (Read 177 times)

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gixxer6

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Polaris Ignition CDI & Coil on Invader.
« on: January 05, 2022, 11:19:58 AM »
With help from a buddy up in Maple Leaf country, I was able to install a CDI/coil from a Polaris on to my modified 81' Invader 440 trial rider.  The CDI has a more modern and improved ignition curve.  My friend built a motor, dyno'd it, then installed the CDI and dyno'd again.  While there weren't any gains to the peak HP, the shape of the curve was dramatically improved in the lower end and mid-range(which is great for a trail rider sled).  I finished the install last night and took it for a ride.  I noticed immediately that it started easier and idled better, so much so, I had to adjust the idle air screws and the idle screws.  Throttle response also seems improved.  I could definitely feel the improved mid-range RPM power as well.  However I will need to make some clutching adjustments to take full advantage of the added performance.  I'm planning to reduce the engagement RPM and increase the upshift which was exactly my goal going into this project. 

Interceptor398

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Re: Polaris Ignition CDI & Coil on Invader.
« Reply #1 on: January 05, 2022, 07:56:34 PM »
Was it a "bolt in" kind of thing?

gixxer6

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Re: Polaris Ignition CDI & Coil on Invader.
« Reply #2 on: January 06, 2022, 08:59:42 AM »
Sort of...  I had to adjust the stator, change the screws on the stator plate to allow it to turn far enough.  The Polaris unit is all one piece, coil and CDI combined.  It bolts right in place in the stock coil location, the bolt holes lined up perfectly.  A few wire crimps and connectors and it started right up.  I plan to do a write-up on the change in the near future.  But we finally just got snow, so that might take the back seat for now...