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Common Carb Issues

228358 Views 133 Replies 74 Participants Last post by  latebird
Just trying to get a list of common carb issues for a 2002 TB.

From what I was able to get from the parts guy from the dealer was the following.

- The needle and seat was a common part to wear out which hinders the carbs ability to prevent fuel from back-flowing out and getting into the air cleaner.

- The pilot jet. Mentioned that it can be cleaned but at $6 it is not a bad idea to replace it.

I am currently trying to resolve a car issue I have right now and would love the feedback.

Please let me know of any other common carb issues. Once I get a bunch of isses I can post the issues and cause.
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The following link ( 2000 Polaris 325 MAGNUM 4X4 HDS (A00CD32FA) Carburetor - A00cd32fb | Part Shark ) is to the mikuni carb on my 325 Magnum. The parts blow up does not match up exactly to the carb that was referenced below in the sticky note from page 1. Can someone tell me what parts in the link to my carb correspond to the parts listed below?

As a test when the engine is warm and you pull the choke it should kill, or almost kill your engine. On my TB if I just touch my choke it will die. If there is no effect either the adjustment is wrong, the idle mixture is too lean, or the choke is still clogged.

Here is a Typical Mikuni Carb blow up. There are many variations but they all use the same basic design.

Parts referenced in this writeup:
#8 Needle Clip - used to adjust the needle height
#9 Needle - this is what is used to meter midrange rpm fuel
#36 Main Jet - this is what meters the high RPM fuel
#21 Idle/Pilot Jet - Meters idle RPM fuel
#32 Idle set screw - adjusts the idle RPM by setting the stop position of the slide (part #10)
#29 Idle mixture screw - used to fine tune the idle mixture
#23 Float arm - notice the small tab in the middle this is what you bend to adjust the float levels
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