98 TRX300 running rich & idles best with mix screw all the way in
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98 TRX300 running rich & idles best with mix screw all the way in
Why would my 98 TRX300 idle best with the fuel mixture screw turned all the way in?
The story: Sat 6 months. Wouldn't start. Disassembled and cleaned carb. Junk in fuel tank clogged some jets. Installed a fuel filter & reinstalled everything. Idle screw set at stock 2 turns out. Started right up & ran fine. I only rode about 10 min. Three hours later, wouldn't start. Smelled like it was getting fuel. Spark was fine. Removed spark plug and found it wet with fuel. Cleaned plug, reinstalled. Started right up and throttled fine. Went to adjust fuel mix screw and found out that it idles best with the screw turned all the way in.
What causes this? How is fuel getting past the mix screw? Could it be something with the choke?
The story: Sat 6 months. Wouldn't start. Disassembled and cleaned carb. Junk in fuel tank clogged some jets. Installed a fuel filter & reinstalled everything. Idle screw set at stock 2 turns out. Started right up & ran fine. I only rode about 10 min. Three hours later, wouldn't start. Smelled like it was getting fuel. Spark was fine. Removed spark plug and found it wet with fuel. Cleaned plug, reinstalled. Started right up and throttled fine. Went to adjust fuel mix screw and found out that it idles best with the screw turned all the way in.
What causes this? How is fuel getting past the mix screw? Could it be something with the choke?
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Hold it, your choke can stick slightly open, this is quite common, it can be the cable but is often the plunger in the carb or the spring on top got water in and rusted away, the little rubber sealing ring can swell and stick too. It is worth checking that the choke is working right before new jets. I never use anything but compressed air and never move the idler mixture screw when cleaning carbs, only had one jet that wouldn't clear with air in over 100 rebuilds, I fitted a new jet on that one.
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