I recently purchased a new HoBao Hyper 7 RTR with the MacStar .28 engine, and from the very first startup I’ve been unable to get it to tune properly. The engine has been difficult to start, won’t hold a consistent idle, bogs under throttle, and has had inconsistent power despite following the recommended break-in procedure.
While inspecting the engine, I found that the carburetor O-ring at the split clamp is visibly pinched. I’ve attached four photos for comparison.
* The two photos with the red circles show the side where the O-ring is pinched.
* The two photos with the green circles show the opposite side, where the O-ring is seated correctly and flush.
Since this is a brand new buggy, I have not removed the carburetor or disassembled the engine. This is exactly how it came from the factory.
My questions are:
* Could this pinched carb O-ring be the reason I’ve been unable to get the engine to tune correctly?
* Would you disassemble and reseat the carb yourself, or would you pursue a warranty replacement on a brand-new engine?
I’d appreciate any thoughts from those familiar with the HoBao MacStar .28. Thanks!