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ETC throttle housing care/ Backfiring fix-ETC adjustmentby jimmypsp700, 2008-04-29ETC throttle housing care Pop the top off of the throttle housing (if you look carefully, you will see that the top cover has little pry notches). If you pry gently at these notches with a small screwdriver, you can remove the cover with no damage to anything. Now look in the housing, and you will see 2 little electrical contacts. Basically, you want to be sure that in normal driving conditions, these contacts are not touching. They are spring-loaded, and are supposed to contact each other when a condition exists where the throttle doesn't close all the way when the throttle lever is released. When they contact, they cut spark to the engine. If there is no noticeable damage, try tightening the throttle cable so that the contacts are not touching. Start the engine in neutral, and turn the bars as far left & right as you can, to be sure that the engine doesn't rev up when you do that. A too-tight throttle cable can cause the engine to speed up on sharp turns sometimes. If you need more details, check out the FAQ for the full description. http://www.atvfrontier.com/Forums/viewtopic/t=16309.html ------------------------ Quick instructions: Adjust the throttle cable for 1/16 inch of slack. Idling in neutral, turn the bars both directions as far as they will go to be sure it isn't so tight that it revs the engine up. Basically, the ETC is a safety feature that cuts the spark if it detects a stuck throttle. It does this by 'feeling' the tension on the throttle cable with a set of spring-loaded electrical contacts. If the cable is too loose, at idle the cable will be too loose, and the contacts will close, cutting spark. If you pop the top off the throttle housing, you can actually see the contacts and how they work. - Thanks to Farmr at the Frontier -------------------------------------------------------------------------------- Polaris, Backfiring fix-ETC adjustment (Article #107 Page 1) Thanks to the ATV Frontier http://www.atvfrontier.com 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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