Adjusting the valves on 2014, 2015 or 2016 Rancher 420 is a straight forward process. If you're Rancher 420 has developed a tinging or pinging sound or backfires and has no power it's time for a valve adjustment. It's pretty common to have to adjust the valves on the Rancher at regular intervals. You'll only need a handful of basic tools and a feeler gauge to get the adjustment completed.
Watch our video of how to adjust the valves by clicking the highlighted text. To start with you will need to remove the outer plastic that covers the fuel tank and sides of the newer 420 Rancher, this is all one piece. I would recommend removing the spark plug so finding TDC will be easier. Remove the pull start block off plate on the rear of the engine (three 10mm bolts). Remove the 6mm allen head plug located on the side of the engine near the rear foot brake. Next remove the valve inspection cover caps with a 15/16 wrench. Check that you have located the "T" on the crankshaft via the 6mm inspection hole. The crank can be rotated with a 16mm socket found under the pull start rope block off plate. You must also make sure you're on the compression stroke and this can be verified by making sure there is just a bit of play in the rocker when you find the "T" mark. If no play in the rockers rotate the engine another 360 degrees to the "T" mark. Once you're in the correct position loosen the 10mm nuts on the rockers. Intake is set at .006 and the exhaust at .009 Take you're feeler gauge and place between the adjustment screw and the top of the valve. Tighten the screw until you feel resistance on the filler gauge. Now tighten the 10mm nut back down and recheck. After completing this adjustment on the intake and exhaust reassemble everything. Start your engine and let it get up to operating temperature. If you had a tinging or pinging prior to this adjustment it should be gone now.
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