Just got my call from pipe city to inform me of my muzzy exaust system is on the way. I leave thursday to saint anthonys sand dunes elevation is around 5000ft. I need help on how I should jet carbs currently I am running 130 front 135 rear with the pink engagement spring. Can any body give me an Idea on how many jet sizes to jump up from were I am now also any info on jet needle and air screw? I would appreciate any help you can give me, I am running out of time. Thanks John A

 

YOU WILL BE PLEASED WITH THE MUZZY I HAVE 138-142 in mine with 2 1/2 and 3/4 inch holes in the airbox lid and mine runs great
check out my bio i have dynosheets and a/f ratio on them you can see how rich stock jetting really is

 

vforcejohn what altitude are you at??

 

Do you have a pics of the airbox thats modified? location of holes

 

What is the best primary spring to run with the muzzy exaust and should I cut holes in my lid for better air flow? I appreciate the advice. Thanks John A