Originally Posted by superk

I have some problem with it. I have an MR12 set w/pipe. After I braking in the engine and did some easy run (Rich) I found out that my idle screw was brocken!?!? after 12 tank of braking in.

I call Mugen today and explain to them that I was factory defect. Some how Mugen USA will not do any thing for me. All I get was bad customer service.

After I decided to take out the idle needle out from my novarossi carb and it works ok.

The question is.... did any one have any problem with this engine?? For the price I do like the engine alot. But, after get this kind of customer service form the distributor it self. I'm very disappointed!!