Altitude

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Mar 9, 2021 | 05:27 PM

TedMan

Thread Starter

Road Warrior

Joined: Aug 2005

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Altitude

So I know our constant velocity carbs handle elevation change, but how high up can I go? I'm looking at trail ridge in Rocky mountain national Park, which peaks at over 11,000 feet.

Mar 9, 2021 | 06:18 PM

Mattbastard

Grand HDF Member

Joined: Nov 2009

Posts: 4,315

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From: Tampa

You'll be fine. The CV carb compensates for air density by just opening less for each intake stroke.

Your idle will drop tho, and you'll be down on power.

Mar 9, 2021 | 06:54 PM

TedMan

Thread Starter

Road Warrior

Joined: Aug 2005

Posts: 1,957

Likes: 288

Quote:

Originally Posted by Mattbastard

You'll be fine. The CV carb compensates for air density by just opening less for each intake stroke.

Your idle will drop tho, and you'll be down on power.

Great, thanks. The previous owner put a thunderslide kit on. Would that affect the ability to compensate?

Mar 9, 2021 | 08:01 PM

rizzo

Seasoned HDF Member

Joined: Dec 2006

Posts: 8,249

Likes: 6,194

From: Black Hills

Mine was tuned for 1000' above sea level and I went up Pikes Peak without a change. It wasn't running it's best but was adequate for that trip. It runs well here @ 5000' without a retune. You'll be fine.

Mar 9, 2021 | 08:07 PM

TedMan

Thread Starter

Road Warrior

Joined: Aug 2005

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Thanks both for advice. Going there right after 4th of July to spread my sister's ashes and didn't want to run into difficulty. Appreciate it.

Mar 9, 2021 | 08:31 PM

Y2K

Grand HDF Member

Joined: Jun 2005

Posts: 3,711

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From: SW WA.

Quote:

Originally Posted by Mattbastard

You'll be fine. The CV carb compensates for air density by just opening less for each intake stroke.

Your idle will drop tho, and you'll be down on power.

Yup,I've done that road with a carbed bike a few times and with different carbs.
The CV did fine,Mikuni 42 I had ran okay but dripped gas out the breather.
Both times bike was tuned at just 300 ft in Portland,Oregon.

Mar 9, 2021 | 08:38 PM

TwiZted Biker

Club Member

Joined: Mar 2009

Posts: 66,145

Likes: 51,486

From: Niles Canyon Ca.

It'll get you there and back but don't expect to running any races doing it. Over 6000' every starts to drop in performance, had the shovel on several roads in Co. at 12'000 + with an S&S on it, you'll do fine