June 30, 2016

Carb Boring... is never boring!

Some boring photos of a Yamaha WR200 carb. Normally this work should be done on a 4-jaw independent chuck. I've used shims and took the carb countless times out of the chuck as to achieve the smallest runout. Then I bored the carb from 29.2mm to 31mm. Normally, the carburetor should be offset as well, as to remove the smallest amount from the base that the carb slide fits.


 


3 comments:

  1. how do you bore the curved venturi part?

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  2. Hi Craig.
    In the last photo you can notice the boring operation. You only need to bore to the diameter you need. As it's only one or a couple millimeters, then the transition still stays smooth with the radius section. If you need a smoother transition then some emery cloth will get the job done. For more radical changes, you need a "ball turning" attachment for the lathe...

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