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A fairly common occurrence on Polaris machines as they get older is for the ETC to get out of adjustment. This is due to throttle cable stretch.

The purpose of the ETC is to cut power to the spark plug in the instance of a throttle that becomes stuck or frozen open. The ETC does this with a spring-loaded set of electrical contacts in the throttle lever housing. As long as there is enough tension to overcome the (light) spring in the housing, the contacts do NOT touch, resulting in normal operation. Whenever the contacts touch, you can lose spark. If your engine seems to sputter/backfire upon de-acceleration, and doesn't always idle smoothly, or, in extreme cases, not well at all, try adjusting the ETC.

Follow the throttle cable where it exits the housing on the handlebar. Where it 'bulges', slide back the cover. There will be a threaded adjuster. Loosen the locknut, and lengthen the adjuster so you get about 1/16 to 1/8 inch of free travel at the end of the throttle lever. Now start the engine. Turn the handlebars to the extreme right and left to be sure the engine doesn't speed up (do this in neutral). If the engine revs, loosen back the adjustment so it doesn't. If it maintains idle speed from full right to left, you got it right.
 

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