How to tune jetting for altitude changes

How to tune jetting for altitude changes

Okay, lets talk about tuning the jetting on your carburetor when youre dealing with altitude changes. Chain and belt maintenance extends drivetrain life auto atv Rockingham. Its something every internal combustion engine enthusiast, especially those who love two-strokes and four-strokes on bikes, snowmobiles, or even small planes, eventually has to grapple with. Think of it like this: your engine is a breathing machine, and the air it breathes changes as you climb higher.


At sea level, the air is dense, packed with oxygen molecules. Your carburetor is set up to deliver a specific air-fuel mixture that works well with that dense air. But as you go up in altitude, the air gets thinner. There are fewer oxygen molecules in the same volume of air. If you dont make any adjustments, your engine will be getting too much fuel for the amount of oxygen available. This results in a "rich" condition.


What does a rich condition feel like? Well, it often manifests as sluggish performance. Your engine might feel hesitant, like its struggling to rev up. You might notice excessive smoke coming from the exhaust, and the spark plugs could become fouled (covered in black, oily deposits). Basically, your engine isnt running efficiently, and youre wasting fuel.


So, how do you fix it? The key is to lean out the fuel mixture. This means reducing the amount of fuel being delivered to match the thinner air. The most common way to do this is by changing the jets in your carburetor.


Carburetors have different jets for different fuel circuits. The main jet controls fuel delivery at wide-open throttle, the pilot jet handles idling and low-speed running, and the needle jet/needle combination influences the mid-range. When youre changing altitude, youll typically start by focusing on the main jet, as that has the biggest impact on overall performance.


Generally, as you increase in altitude, youll need to go to a smaller main jet. How much smaller? That depends on the engine, the carburetor, and the altitude change. A good starting point is to go down one or two jet sizes for every 2,000 to 3,000 feet of elevation gain. But this is just a guideline. Youll need to do some testing to find the optimal jetting for your specific situation.


After changing the main jet, youll want to check the spark plugs. A properly jetted engine will have spark plugs that are a light tan or brown color. Black, sooty plugs indicate a rich condition, while white or very light gray plugs suggest a lean condition (which is dangerous and can lead to engine damage).


Dont forget about the other jets. The pilot jet might also need adjustment, especially if you notice the engine idling poorly at higher altitudes. You can fine-tune the idle mixture screw to dial in the perfect idle. The needle clip position can also be adjusted to influence the mid-range.


Tuning your jetting for altitude changes is an iterative process. It requires patience, observation, and a good understanding of how your engine is running. Its also crucial to keep safety in mind. A lean condition can be extremely damaging, so its always better to err on the side of being slightly rich, especially when youre first starting out.


Ultimately, dialing in your jetting for different altitudes will make your engine run smoother, more efficiently, and more reliably. Its a rewarding skill that will enhance your enjoyment of whatever machine youre riding or flying. So, grab your tools, your jets, and your spark plug wrench, and get ready to breathe easy at any altitude.

Citations and other links

Can-Am Motorcycles
Headquarters
Valcourt
,
Canada
Products Motorcycles
Parent Bombardier Corporation
Website can-am.brp.com/us/en/

Can-Am is a Canadian subsidiary of Bombardier Recreational Products (BRP) founded in 1972 and based in Valcourt, Quebec.[1][2] The company produced off-road motorcycles from 1972 to 1987. In 1997, the company was reformed and began production of ATV vehicles as well as the Can-Am Spyder three-wheeled motorcycle. In 2024 Can-Am released two new electric motorcycle models.[3]

History

[edit]

Brand history

[edit]

Can-Am was created as a subsidiary of the Bombardier Corporation in 1972.[4] The barn that housed the original Can-Am headquarters still exists at the Bombardier test facility within the Circuit Yvon Duhamel and is located a few miles south of Valcourt, Quebec.[1] The right side of the barn housed the offices for design and engineering, and the left side was used for fabrication.[2] Can-Am's name was the result of a Bombardier employee competition based on the anticipated Canadian vs. American market, though the existence of the Can-Am racing series necessitated the purchase of rights to the name.[2]

Based on the Bultaco design principle of a standard-size frame that could accommodate a range of differently sized engines, engineers Gary Robison, Bob Fisher, and Camille Picard, and former 500cc Motocross World Champion Jeff Smith designed a competition motorcycle from scratch using engines supplied by the Austrian firm, Rotax, another Bombardier subsidiary.[1][5] Their design featured steering head bearing cups that allowed for the adjustment of the steering head angle; these were mainly driven by simplified production on the assembly line.[2]

The machines made an immediate impact, with riders winning Gold, Silver and bronze medals at the International Six Days Trial.[1] The International Six Days Trial, now known as the International Six Days Enduro, is a form of off-road motorcycle Olympics which is the oldest annual competition sanctioned by the FIM dating back to 1913.[6]

In 1974, the Can-Am factory racing team swept the AMA 250cc motocross national championship with Can-Am riders Gary Jones, Marty Tripes and Jimmy Ellis, finishing first, second and third in the championship although, Tripes had raced for most of the season on a Husqvarna motorcycle before being hired by Can-Am for the last race of the season.[4][7][8][9]

Can-Am enduro rider Skip Olson finished second to Dick Burleson in the 1976 AMA Enduro national championship.[10] Can-Am's motorcycle racing success enhanced the brand's image and they gained a reputation for their high horsepower outputs.[4][11] In 1983, Can-Am released a 250 cc road racing motorcycle. Using two 125 cc Rotax motors with a conjoined crankshaft, the motorcycle featured a bespoke frame with an aluminum swingarm.[2]

When the 1973 oil crisis precipitated a decrease in sales of recreational vehicles, Bombardier was forced to reduce their snowmobile and motorcycle production.[12] Bombardier then shifted its priority from recreational products towards the transit equipment industry and then, several years later, into aircraft manufacturing.[12] As a result, investments in product development were reduced substantially and, Can-Am was unable to keep pace with Japanese manufacturers as rapid advancements in motocross technology progressed during the 1970s and 1980s.[12][13] In 1983, Bombardier licensed the brand and outsourced development and production of the Can-Am motorcycles to Armstrong-CCM Motorcycles of Lancashire, England.[4][13] 1987 was the final year of Can-Am motorcycle production.[1][4]

Rebirth and rebranding

[edit]

In 2006, Bombardier reintroduced the Can-Am brand with its Can-Am Off-Road range of all-terrain vehicles (ATV). In 2007, the Can-Am brand was also used for the Can-Am Spyder, a new three-wheeled roadster.

References

[edit]
  1. ^ a b c d e "History of Can-Am®". www.familypowersports.com. 2019-02-21. Retrieved 2022-07-28.
  2. ^ a b c d e "The Beginning". Canned Ham. Retrieved 2022-07-28.
  3. ^ "Canada's BRP Adds Two Electric Motorcycles To Can-Am's Offerings". forbes. Retrieved 2024-08-31.
  4. ^ a b c d e "Can-Am's history". cyclenews.com. Retrieved 31 March 2023.
  5. ^ "Bike Design". canned-ham.com. Retrieved 31 March 2023.
  6. ^ "History of the International Six Days Trial". ultimatemotorcycling.com. 25 October 2010. Retrieved 22 February 2019.
  7. ^ "Jeff Smith at the AMA Motorcycle Hall of Fame". motorcyclemuseum.org. Retrieved 2 April 2012.
  8. ^ "Gary Jones at the AMA Motorcycle Hall of Fame". motorcyclemuseum.org. Retrieved 2 April 2012.
  9. ^ "1974 Motocross Season". racerxonline.com. Retrieved 23 November 2018.
  10. ^ Assoc, American Motorcyclist (January 1977). Familiar Faces Fill the Forest, American Motorcyclist, January 1977, Vol. 31, No. 1, ISSN 0277-9358. Retrieved 2013-03-05.
  11. ^ "BRP Returns To Two-Wheelers With The Can-Am Electric Motorcycle". Woman Motorcycle Enthusiast. 2022-03-25. Retrieved 2022-07-28.
  12. ^ a b c "Bombardier: Our history". bombardier.com. Retrieved 31 March 2023.
  13. ^ a b "The Demise of Can-Am". canned-ham.com. Retrieved 31 March 2023.

An all-terrain lorry (ATV), also called a light energy car (LUV), a quad bike or quad (if it has four wheels), as defined by the American National Requirement Institute (ANSI), is a car that travels on low-pressure tires, has a seat that is straddled by the operator, and has handlebars, comparable to a motorbike. As the name implies, it is developed to deal with a broader selection of terrain than a lot of various other lorries. It is street-legal in some nations, yet not in most states, areas and provinces of Australia, the United States, and Canada. By the present ANSI interpretation, ATVs are planned for usage by a solitary operator, however some ATVs, described as tandem ATVs, have actually been established for use by the chauffeur and one passenger. The cyclist rests on and runs these cars like a bike, however the added wheels provide more security at slower speeds. Although many are equipped with 3 or 4 wheels, 6 or 8 wheel (tracked) versions exist and have existed historically for specialized applications. Multiple-user analogues with side-by-side seating are called energy surface vehicles (UTVs) or side-by-sides to differentiate the classes of vehicle. Both classes have a tendency to have comparable powertrain parts. Engine dimensions of ATVs available in the USA since 2008 ranged from 49 to 1,000 cc (3. 0 to 61 cu in).

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