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I have been experimenting with different carbs over the last couple of months as I wasn't happy with the transition from idle to high speed.
This is a Traxxas TRA4033 on the engine now and I am very impressed with it. The fuel adjustment for both low and high speed operation were very precise and predictable. A joy to setup.
I had to make modifications to the throttle linkage and carb bracket to install it.
It likes to idle around 1000rpms and the response is greatly improved.

Thanks to Brian Rupnow for his suggestion.




Thanks for looking
Ray
 

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