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TOPIC: Alltitude Riding
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Alltitude Riding 2 Years, 11 Months ago
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On a 1600, carb engine, would going from about 900ft. elevation about 5500ft. really affect it much?? |
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Re:Alltitude Riding 2 Years, 11 Months ago
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Fuel/air starvation issues. Others in this situation will have more info.
GP
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Re:Alltitude Riding 2 Years, 11 Months ago
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In answer to your question, the altitude change will affect how you star runs, especially and altitude change that drastic. The higher you go, the thinner the air gets which in turn will cause your scoot to run richer which if ran for prolonged periods in rich condition could cause plug fouling as well as carbon fouling on the valves. I have done a ride several times where my altitude changed from 4200' to just over 5280' and the bike begins running sluggish until I drop back down closer to the altitude the carb was jetted for.
Of course I believe my star may have been jetted just a little leaner than it needed to be so that may have also contributed to the symptoms I encountered.  |
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There are OLD BIKERS and there are BOLD BIKERS, but there are NO OLD BOLD BIKERS!
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Agpilot (User)
Gold Boarder
Posts: 948
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Re:Alltitude Riding 2 Years, 11 Months ago
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GOOSE915 wrote:
In answer to your question, the altitude change will affect how you star runs, especially and altitude change that drastic. The higher you go, the thinner the air gets which in turn will cause your scoot to run richer which if ran for prolonged periods in rich condition could cause plug fouling as well as carbon fouling on the valves. I have done a ride several times where my altitude changed from 4200' to just over 5280' and the bike begins running sluggish until I drop back down closer to the altitude the carb was jetted for.
Of course I believe my star may have been jetted just a little leaner than it needed to be so that may have also contributed to the symptoms I encountered.
Wrong, you will not run richer.. the Mikuni is a constant velocity carb. it will automatically lean for altitude.. You will have a leaner running bike with less power due to atmospheric pressure.. Manifold pressure is limited to the barometric pressure (unless you are supercharged) the higher the altitude the less pressure equals less HP>>> You will get better mileage at altitude... Do some research regarding Constant Velocity Carb..
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vegasdave (User)
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Posts: 1209
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Re:Alltitude Riding 2 Years, 11 Months ago
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Agpilot wrote:
GOOSE915 wrote:
In answer to your question, the altitude change will affect how you star runs, especially and altitude change that drastic. The higher you go, the thinner the air gets which in turn will cause your scoot to run richer which if ran for prolonged periods in rich condition could cause plug fouling as well as carbon fouling on the valves. I have done a ride several times where my altitude changed from 4200' to just over 5280' and the bike begins running sluggish until I drop back down closer to the altitude the carb was jetted for.
Of course I believe my star may have been jetted just a little leaner than it needed to be so that may have also contributed to the symptoms I encountered.
Wrong, you will not run richer.. the Mikuni is a constant velocity carb. it will automatically lean for altitude.. You will have a leaner running bike with less power due to atmospheric pressure.. Manifold pressure is limited to the barometric pressure (unless you are supercharged) the higher the altitude the less pressure equals less HP>>> You will get better mileage at altitude... Do some research regarding Constant Velocity Carb..
And i always thought i was only gettn better milage up at BrianHead UT.(7-10,000 ft.) because we were doin 40 to 50 mph must of the time. 
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If Your Not Moving Forwards,Your Moving Backwards
Live To Ride,Ride To Live 06 Road Star Candy Red
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Re:Alltitude Riding 2 Years, 11 Months ago
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You're gonna like the MPG that your rodaie gets up there. My ran like a champ, I got 20-30 miles more on a tank of gas.
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Erbman02 (User)
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Posts: 5279
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Re:Alltitude Riding 2 Years, 11 Months ago
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AgPilot is right, as I have learned from him, as well as doing searches on CV carbs and learning more about them too. Now in my case, my carb will run rich, since it is not a CV carb, my throttle controls the slide only. |
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Re:Alltitude Riding 2 Years, 11 Months ago
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A couple of years ago I rode from Ft. Lauderdale Florida 9 feet to Tennessee and on the Cherahola Skyway, I have a picture of me on Huckleberry Knob 5280 feet. The scoot ran strong and I really never noticed a loss of power. I have ridden quite a bit on carb'd motorcycles at altitude and sometimes you can really tell, but usually not until you are over the 8000 foot level where air starts to get thin. I rejetted an old 350/4 Honda at the top of Loveland pass in Colorado once at just under 12,000 feet. The poor bike would barely run. My 750/4 Honda ran fine although noticeably less powerful. |
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Agpilot (User)
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Re:Alltitude Riding 2 Years, 11 Months ago
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Yea, at higher altitude you will have a loss of power.. that is just the law of physics.. the only way to change that is to force feed air into your air induction, (supercharger, or turbo charger.) But you guys need to quit worrying about the jetting on the Mikuni if you change altitude...It will take care of you... Unless like erbman your are using a flat side Carb.. instead of a Venturi style such as your Mikuni!! |
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Re:Alltitude Riding 2 Years, 11 Months ago
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workharddieproud wrote:
On a 1600, carb engine, would going from about 900ft. elevation about 5500ft. really affect it much??
I won't argue the technical side of this but I will speak from experiance. I live in the low desert of Arizona and my bike is jetted for 300'. I have taken off and riden through colorado,wyoming,montana,utah,south dakota etc and have been as high as 10,000' above sea level. My 2000 R* never missed a beat on any of my trips. Other then I might notice a mileage difference on the trip meter I never experianced my bike runing any differently. So I'm going to say No there is no affect!!
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