1. VMX-61PRO ABC Engine w/Ball Bearings
1.1. VMAX 61PRO - Documentation
Please see the attached PDF documents related to this engine. File names indicate the nature of the document.
VMAX Engines - Documents - Common to Many Engines
These documents are common to many or all VMAX Engines and are in addition to other information that may be specific to a particular engine.
1.2. 61PRO - Low Speed Mix Factory Setting for adjustment Screw.

Question: I have inadvertently adjusted the low speed mixture to the point that I am not happy with where I ended up. I want to return to the original factory setting and then work from there but I forgot to take note of the original setting. Can you tell me the original factory setting for the low speed mixture screw on a VMAX 61PRO?

Answer: Yes. Here are some tips to help with this.

a) Please review carefully the owners manual that came with your engine. Look for the section related to adjusting the low speed mixture. As of  20071201 this was sections 6.9 and 6.10. Read these sections over carefully and them read them again. Do not proceed until you have read these sections AND have met the conditions stated therein. In particular note that you should not be mucking with the low speed mixture screw until you have broken in the engine to the degree specified in the owners manual. Mucking with the low speed mixture screw too early is a waste of time and will cause you a bunch of grief and aggravation for nothing.

b) After reading the sections of the owners manual related to adjusting the low speed mixture, if you want to return the low speed mixture adjustment screw to its original factory location, please do the following:

  • Rotate the screw clockwise so that it moves into the carburetor while counting the rotations until the screw becomes tight to turn. Do NOT OVER TIGHTEN... once the screw is snug and does not want to turn, STOP. This is not a tractor and there are no points given for brawn here... stop turning when the screw starts to get snug.
  • Now turn the screw counter-clockwise so that it starts to back out of the carburetor.
    • Rotate the screw and count one and a quarter (1-1/4) full turns for a 61PRO

Thats it. You are more or less back to the original factory setting.