How important is the washer under main jet?

[Frosto]

I just picked up my first blaster it runs not great i was told it just needed carb adjustments but ive been playing with it watching youtube videos come to find out it has no washer under the main jet and it looks like it should. Is that necessary and if so can i replace that instead of the entire carb?

 

[Jota]

Hi, I don´t know if the washer it´s important, but it is easy to put one similar and try, I think only it´s to avoid damage on the carb body thread.

But the plastic thing that it´s fitted to the main jet it´s very important, mine doesn´t have it and got some bad low range, I print a new one with a 3D printer, and now at low revs it´s much better.

Hope this help you.