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A/F guage in... 120-130

posted by  Phil S. on  Sun Jun 19 10:50 CST 2005
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last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

I can't give you sepcific jet sizes for your motor, but the IPD kit will have pretty much what you need. It has to be done in this order, and with the motor at full operating temp:

Use the primary idle jet that lets you tune the mix screw for best/fastest idle with the screw 1-1/2 to 2 turns off its seat. This will be approximately 14:1 A/F, but tune it by ear. Readjust the idle speed and reset the mix screw until it all settles down.

Use the primary main jet that gives you 14:1 A/F under enough throttle that the secondary isn't opening yet.

Use the secondary main that gives you slightly richer mix -- 13:1, say -- under full throttle with both barrels open.

Use the smallest secondary idle jet (misnomer -- low-speed jet, it should be) that gives you good transition as the secondary opens.

Don't worry about the mixture going off-scale lean under decceleration.






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