Hi. I recently had to replace the diaphragm on my QM 500, so I decided to add a sigma 6 jet kit. I basically replaces the main jet with a 135 (was 130) and moved the clip on the needle down one space (as per their directions) towards the RICH direction. Now that I have it reinstalled it starts great, idles great but if you try and give it any throttle it sputters, pops and looses all power. With the choke on it will accept throttle.
This implies to me that I am running LEAN, which seems strange as I moved the needle towards rich and put a bigger jet in?


I have checked the rubber connections on either side of the carb, the carb has been out and it is CLEAN.

So any thoughts other then just "clean the carb".

Thanks

Chris

 

If you moved the needle down a notch, it will have leaned it.

 

According to the directions that came with the kit, moving the clip down is richer. Moving the clip up drops the needle making it leaner. .. I'll try moving the clip up anyways though.

 

"Moving the clip up drops the needle making it leaner" Just a difference in terms, to me moving the needle down a notch sounded like you were lowering it. Richen it another notch, if it then soots the plug you will have to go back to standard jets.