new kart! (tn)

[bubbagump]

i got this kart for a steal its got a 9 hp honda gx270 eninge and brand new racing slicks and alll i paid was $400

i need a racing buddie i live in middle tennessee so let me know if u wanna race or go somewhere

 

[exenos]

WOW, nice kart. Have you tried taking it for spin with the plastic still on the wheels? Also, do you know if the engine has been modified in any way? Or is it all stock?

 

[bubbagump]

it is only modified by the exhaust it has a pipe welded and it shoots out to the left side. When i picked it up had the plastic off it can go about 40 (give or take) id say im only 140lbs but is there anything i can do to make it faster and not harm the life of the engine.

ps i am not really a engine guy i know how to use a wrench and can follow instructions

 

[OzFab]

is there anything i can do to make it faster and not harm the life of the engine.

Being that it's a racing kart I would think there wouldn't be much that hasn't already been done to make it as quick as possible. What is the drive system/gear ratio?

 

[Nodroz]

I have exact the same engine on my kart. Although my kart is pretty heavy, I still can go around 50km/h. I'm very happy with the engine, it gots some power!

Nice found, goodluck and stay safe!

 

[bubbagump]

yeah the kart itself is kinda heavy but i meant around 40 mils per hour
@fabroman i do not know is there a way i can tell?

 

[OzFab]

@fabroman i do not know is there a way i can tell?

Does it have a clutch or cvt?

If it has a clutch, count the teeth on it & the axle sprocket (& on the jackshaft if it has one).

Oh, & show us a pic of the drive (from the engine to the axle)

 

[bubbagump]

mine does not have a chain it is a belt.. i do not know what a cvt is or a jackshaft

 

[SCK]

Nice kart man!

 

[exenos]

Would you be able to count the number of teeth/grooves on the pulley on the main axle and the number on the clutch/ pulley on the engine?

CVT- Continuously Variable Transmission, also called a torque converter. It functions like a automatic transmission by changing the sizes of the two pulleys that the belt runs on. (A picture or video can give a much better idea of how it works)

http://www.youtube.com/embed/pptnRGTH_XA

A jack shaft is just a secondary axle that is used to mount sprockets/pulleys on. It is generally used to increase the reduction from the engine to the wheels without having to have a massive sprocket on the main axle. Ie. a 10 tooth on the clutch to a 20 tooth on the jack shaft that has another 10 tooth on it that goes to a 30 tooth on the axle gives a 6:1 ratio, just like having a 10 tooth clutch and a 60 tooth on the axle.
Jack shaft examples

This one shows both a CVT and a jack shaft.

 

[Doc Sprocket]

With a cogged belt, the same type of calculation still apply. You can either count the "teeth" on both pulleys, or measure them for diameter.

 

[bubbagump]

http://www.youtube.com/watch?v=o0w9efIOjyo
i tried my best for a quick video i measured the main axle to be 7.5in and the clutch to be 3.5in both in diameter

 

[exenos]

How did the kart feel when you took it for a run? Did it feel snappy or did it feel kind of slow to get up and go? I'm asking this because with those sizes you should have a 2:1 gear ratio and if those are 11" tires you should be going 60Mph. The ratio might be too steep.

 

[B man]

I think you have one of those High dollar concession race karts. Mainly cause thats the only time you usually see that style clutch and belt. but im betting the engine is stock.

Im in TN too. what town you in?

 

[bubbagump]

it is a lil slow to get going but it does go id like a little more "off the line speed" and yes it used to be a commercial kart
i live in murrfreesboro

 

[OzFab]

it is a lil slow to get going but it does go id like a little more "off the line speed"

To achieve that you either need a smaller drive pulley (on the engine) or a larger driven (axle pulley).

Note: In doing so you will lose a bit of top end speed

 

[landuse]

I don't know if any of you noticed, but he has a gear reduction unit on his kart which has a wet clutch inside. If you look at the pic you will see where I circled it. I have also added a pic or two of what they look like inside

These boxes have different gear reductions, but the most common is a 2:1 reduction ratio. This means that when you are calculating your gearin, you need to divide the "clutch/reduction box" sprocket by 2 to give you the correct gearing. As an example, if you have a 20T sprocket on the box, and a 60T on the axle, your gearing will be (20/2)/60 = 6:1. You see how I divided the 20 by 2?

 

[exenos]

Hey, thanks for pointing that out land use. a 4:1 ratio makes much more sense than a 2:1 ratio.

 

[Doc Sprocket]

7.5 / 3.5 * 2 = 4.29:1

That's assuming the redux box is at 2:1. Anderkart would know if that ratio is in the ballpark. I suspect it is.

 

[bubbagump]

so is there anything i can do to the reduction box to make it a little faster also do you think a new spark plug will do much of a difference