ruing carb. problem?

jm57racing

New member
We have a brand new ruing carb out of the box. Idles good but once you throttle it up past a quarter throttle it backfires and spits and seems to lean way out. We had another ruing that did this last year and finally give up on it. Weve took it apart cleaned it out changed jets emulsion tube bowl bowl gasket check low idle side jet and oring. Found no problem. We put another carb on the engine to make sure it wasnt the engine runs great. Put the other carb back on same problem. Has anyone else seen this issue? Help please.......
 
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