Bandit Alley
GENERAL MOTORCYCLE FORUMS => GENERAL MECHANICAL & TECHNICAL => Topic started by: DjVas on February 26, 2007, 04:14:49 PM
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New to the bike scene here and don't know much about this. What exactly is a jet kit?? Any site where I can find info on what it is and what it does? THanks in advance!
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http://www.ivansperformanceproducts.com/bandit1200.htm
http://www.ivansperformanceproducts.com/bandit600.htm
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Jets are metered orifaces in the carburators that determine how much fuel the engine gets. In most cases, jets can be removed and replaced with ones of different size to alter what the factory set. Since the advent of emissions regulations, factory settings are usually lean. A jet kit will richen things up from stock and is advisable anytime you make any other alterations to the amount of air the engine moves - such as an improved exhaust system and/or air filter. They may include some or all of the following: new jets, shims, needles, air filter(s), timing advancer, special instructions for carb and/or air box modifications. What you get will vary depending on the bike and what the kit maker feels is the best combination for the level of tune they're selling.
Visit the various kit makers to see what they're offering and read some of the posts in here on what tohers with your bike have done.
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Jets are metered orifaces in the carburators that determine how much fuel the engine gets. In most cases, jets can be removed and replaced with ones of different size to alter what the factory set. Since the advent of emissions regulations, factory settings are usually lean. A jet kit will richen things up from stock and is advisable anytime you make any other alterations to the amount of air the engine moves - such as an improved exhaust system and/or air filter. They may include some or all of the following: new jets, shims, needles, air filter(s), timing advancer, special instructions for carb and/or air box modifications. What you get will vary depending on the bike and what the kit maker feels is the best combination for the level of tune they're selling.
Visit the various kit makers to see what they're offering and read some of the posts in here on what tohers with your bike have done.
Info taken From 'PaulAPedia'
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I C ! thanks guys! :thanks: :thanks:
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I hate to be Ned Nitpicker but jets don't always meter fuel mixtures. Sometimes they can meter air also. Depending on what effect you're looking to achieve will dictate what kind of jets to replace.
The most basic upgrade to bikes you'll likely hear is getting it "jetted and piped." You basically richen the mixture by putting larger jets in and then put on aftermarket exhaust kits to allow a better flow of air and exhaust through the engine. A full header and pipe kit does wonders for your set up. My bike has a slip on exhaust but I didn't bother to tweak the engine. The slip on uses the stock exhaust manifold but an aftermarket muffler. I have a micron.
The sky is the limit really, you can jet it, pipe it, do ignition advancing and chips and all that stuff.
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Jet kits never contain air jets. The two air jets used are the pilot air jet and main air jet. The pilot air jet is located on the edge of the intake venturi as is the main air jet unless they are located under the slide diaphragm lid. The purpose of the pilot air jet is to provide air to the pilot (idle) circuit and the main air jet provides air when the slide is closed. Both work in conjunction with the slide cut out which also allows some airflow when the slide is closed.
As has been noted, most jet kits contain jet needles and main jets. I think the intend to richen the mid-range and open throttle areas of operation. Most jet kits do not contain pilot jets. I have noticed that in stock form, the Bandit 1200S doesn't like to start without choke and warms fairly slowly. I suspect it would do well with the idle mixture richened just a tad. This may or may not be possible by adjusting the mixture screws. It may be that going up one size pilot jets would make the bike more friendly at start up.
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I hate to be Ned Nitpicker but jets don't always meter fuel mixtures. Sometimes they can meter air also. Depending on what effect you're looking to achieve will dictate what kind of jets to replace.
OK, Ned, let me pick the fly dung from the pepper then. :wink:
Jets are metered orifaces in the carburators that determine how much fuel the engine gets.
Nowhere in my statement does it say jets always deliver fuel. It just says they determine how much fuel the engine gets. If you only increased an air jet, the mixture would be leaner, which is less fuel - in a ratio perspective.
Perhaps it would be better if I said:
Jets are metered orifaces in the carburators that determine the fuel mixture the engine gets.