Altitude questions
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Road Master
Joined: Feb 2007
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From: Iowa
Altitude questions
Part of my reason for joining the forum was to learn by asking questions. I am in Iowa now and our average elevation is 1,000ft. Am planing a trip to Colorado and New Mexico this late Spring. Average elevation where are going it 7,000 ft plus. Should I rejet for approx 5,000ft of elevation before I head west and hope for the best? Or should I pay the Harley shop in Pueblo $125-150 to rejet once there? Another option is installing the S&S Super E carb with the Thunderjet option. Trips like these will be once a year, and the majority of my time will be at the 1000 ft elevation otherwise. So Im looking for opinions... I know everyone has them. hehe Thanks in advance... this forum looks like what I was looking for... LOTS of reading!! Thanks in advance.
Bob
Bob
Road Master
Joined: Jul 2005
Posts: 916
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From: Mauldin, SC
RE: Altitude questions
Unless you're super rich now, I doubt you'll have major problems. You can adjust your idle mixture screw when you get there and even change jets in a few minutes if you take some with you. Changing the needle would be maybe 30 minutes, but could also be done when you get there if you think it's really necessary. You'll probably be riding between 5,000 and 12,000 feet in Colorado, so there's no way you can be ideal all the time.
You didn't say what's been done to your bike or what carburetor you have, but my Dyna with the CV runs fine from 1,000 feet at home to over 6,000 feet on the Blue Ridge Parkway.
What would you do to "rejet for approx 5,000ft of elevation"? $125-150 for a dealer to rejet a carburetor sounds a little extreme to me.
You didn't say what's been done to your bike or what carburetor you have, but my Dyna with the CV runs fine from 1,000 feet at home to over 6,000 feet on the Blue Ridge Parkway.
What would you do to "rejet for approx 5,000ft of elevation"? $125-150 for a dealer to rejet a carburetor sounds a little extreme to me.
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Road Master
Joined: Feb 2007
Posts: 1,209
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From: Iowa
RE: Altitude questions
I did just (in the last 2 weeks) change exhaust from V&H Short Shots to Thunderheader and havent put the bike on a Dyno to see if I need to rejet. The bike was rejetted then the V&H were installed. Its been too cold to get it the 50 miles to the Harley shop for that so far. I did plan on getting that done in late March before riding season starts. And this is exactly what Im looking for.. positive input as to even if I need to make any changes. Thanks for the replies so far!!
Bob
Bob
Road Warrior
Joined: Dec 2005
Posts: 1,950
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From: Colorado Springs, CO
RE: Altitude questions
As you go up in altitude, you get less air. Therefore, you need less fuel. If you're a little rich now, you'll be very rich at 10K'.
The stock CV carb is very good at adjusting for altitude. Much better than most aftermarket carbs like S&S. I think changing to a differant carb would make it worse. Except for the Edlebrock, which is also a CV type carb.
Do you need to rejet? Maybe.The carb can compensate for 5-6K' without any trouble. You're talking about a change of 10K' at the high passes. The carb probably can't compensate for that much of a change.
I think if you jetted it for Pueblo (4,900'), then you'de be good in CO and at home.
The stock CV carb is very good at adjusting for altitude. Much better than most aftermarket carbs like S&S. I think changing to a differant carb would make it worse. Except for the Edlebrock, which is also a CV type carb.
Do you need to rejet? Maybe.The carb can compensate for 5-6K' without any trouble. You're talking about a change of 10K' at the high passes. The carb probably can't compensate for that much of a change.
I think if you jetted it for Pueblo (4,900'), then you'de be good in CO and at home.
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