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Old 01-23-2014, 09:50 PM
kartnewbie27e kartnewbie27e is offline
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Default good deal on this kart?

Browsing craigslist and came across this kart. Gonna see if I can get it for $350. What do you guys think?
Does it have 2 chains on it, or am I just seeing things?



http://macon.craigslist.org/sno/4286646686.html
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Old 01-23-2014, 09:52 PM
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Browsing craigslist and came across this kart. Gonna see if I can get it for $350. What do you guys think?
Does it have 2 chains on it, or am I just seeing things?


http://macon.craigslist.org/sno/4286646686.html
no your not seeing things it has a jackshaft setup on it. nice kart for $350 but i would try to talk hem down to about $300 at $350 that's a little pricey for me.
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Old 01-23-2014, 10:04 PM
kartnewbie27e kartnewbie27e is offline
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Jackshaft? I've got some learning to do.
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Old 01-23-2014, 10:11 PM
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Jackshaft? I've got some learning to do.
A jackshaft, also called a countershaft, is a common mechanical design component used to transfer or synchronize rotational force in a machine. A jackshaft is often just a short stub with supporting bearings on the ends and two pulleys, gears, or cranks attached to it. In general, a jackshaft is any shaft that is used as an intermediary transmitting power from a driving shaft to a driven shaft.
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Old 01-23-2014, 10:17 PM
kartnewbie27e kartnewbie27e is offline
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Sooo, it's like a torque converter?
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Old 01-23-2014, 11:01 PM
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Sooo, it's like a torque converter?
Not at all. All a jackshaft does is allow for compound gear reduction.

Think of it this way. If you want a 10:1 gear ratio, and you just use a clutch and axle sprocket, you are going to have to have a combination something like a 10T clutch and 100T axle sprocket. A 100T sprocket is unrealistic and will probably drag through the dirt cos it is so big. So what do you do?? You use a jackshaft. With this, you can use smaller sprockets all around, and still get the 10:1 gear ratio without scraping your a$$ through the dirt.

You could have a combination like 10T on the clutch going to a 25T on the JS In side (this will give you a ratio of 2.5:1). You can then have a 14T sprocket on the JS OUT side going to a 54T on the axle (this gives you 3.85:1). If you multiply these ratios, you will get a 9.625:1 ratio. You can use all sorts of sprocket combinations to get whatever ratio you like, and the sprockets can be a lot smaller that if you just had a clutch and axle sprocket

Some pics of my minibike jackshaft below, but it is the same concept for a kart
Attached Thumbnails
10102011639.jpg   26062011488.jpg  

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