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400AT Jetting questions and valve clearence

1645 Views 1 Reply 2 Participants Last post by  Truckman
A friend of mine has jetted his 400 rancher. I believe he has only put an air filter on. We need to make some adjustments to the air/fuel mix screw. How many turns is everyone doing on there's? He doesn't have an exhaust yet. Also we need to do a valve adjustment, what;s the clearence on those? Thanks!
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.006" for the valves.The sight plug is hard to see into on the 400at so take your time to make sure it's at TDC.
start at 2 1/2 turns out on the screw but you may have to go more (unscrew)if you get any backfires on deceleration.
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