I am working on a 91 Yamaha 350 Moto-4 ATV. I have trolled the net and youtube looking for someone who has the problem I have.

I am familiar with working on dirt bike and ATV carbs.

This particular carb has the emulsion tube/main nozzle inside a plastic pillar. The main jet is stuck, it will not come loose from the emulsion tube.

When you turn the main jet to loosen it, the whole emulsion tube/main nozzle spins with it inside the plastic housing. I do not know how to fix this.

Normally the emulsion tube on other carbs is threaded into the carb body, and it is metal. You have more options like heating it, soaking it in carb dip, etc. But with this being a plastic part I am stumped.

 

Are the parts available for a reasonable cost? you may be looking at replacing it, if you can buy the parts you at least know if you destroy it trying harder, your not totally buggered. Otherwise soak it in seafoam and blow it out with air, put it back in and see how it runs.

 

I think the main nozzle is $30-40 and the main jet is $10 or $15 approx. I could just do as you said, put it all back together and see if it runs.