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94 xlt sp 580 5100 bone stock, so bad needles and seats i replaced , cleaned synced carbs went through choke plungers 1/8 inch , new plugs 0.7 mm, good float heights, so it starts well and idles well but after 2 min will slowly lower its idle to 1000 rmps and usually wont stall but sometimes it will if you hit gas its perfect and strong wtf , i have NOT drained crankcase after needle and seats is this my mistake thanks
 

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94 xlt sp 580 5100 bone stock, so bad needles and seats i replaced , cleaned synced carbs went through choke plungers 1/8 inch , new plugs 0.7 mm, good float heights, so it starts well and idles well but after 2 min will slowly lower its idle to 1000 rmps and usually wont stall but sometimes it will if you hit gas its perfect and strong wtf , i have NOT drained crankcase after needle and seats is this my mistake thanks

Cable adjustment?
 

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you should adjust your idle once machine has warmed up to operating temps. XLT has no thermostat so I'd let it idle until under running board coolers are warm before adjusting idle.
 
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