TOM SCHANNE
XS400 Enthusiast
I'm running stock actual Mikuni jets in my 81 XS400HS , 135 mains and 42.5 pilots. The air mixture screws are both out at three turns from seated. The bike is running good but I want to make sure I'm not running too lean and potentially hurting the engine.
Here's pictures of the plugs (right side first) and the blueing of the pipes.
Here's pictures of the plugs (right side first) and the blueing of the pipes.