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First I want to thank Trollcat for the picture and info that he provided. Here is what I did to make the machine run at 10,000 ft. The ( 4 ) small 3/16 fittings on the carbuertors that attached to the sides of the T fitting coming off of the HAC valve are vent lines. All you need to do is buy a...

What needs to be done with the other ( 4 ) 3/16 lines on the carbs. Arn't they the ones that need to be plugged? Don't they change the vacuum in the carbuertors that causes a leaner mixture? I guess I'm confused. If anybody has a link to doing this it sure would help me out. Thanks again

Thanks for the info. I forgot to mention that we do all of riding at 10,000 on the Grand Mesa in Colorado. If I plug the 1/4 port then which port is the vent?

I have been reading the posts on removing the hac valve and jetting for altitude. I tried to adjust the hac valve as suggested on one of the posts. Measuring from the end of the tube at the end of the hac to the actuating pin. 3 to 7 mm. Mine was 9mm. Set it to 4.5 and the machine still didn't...