small sprocket

[schmanman]

I am having problems with the gearing and the speed I am getting out of my minibike.What is the smallest sprocket I can get. links to the website where they are available would be of huge help. right now ,I have a 72 tooth sprocket on there.Does anyone know where I can get a sprocket with between 30 and 45 teeth (or anywhere in the 30-40 tooth range) .Thank you so much for your help the bolt pattern has 4 bolts,about 3 inches apart . the sise of the center does not matter at the moment.It can be enlarged on a lathe or mill . anyway,help and links to the websites would be greatly appreciated.

[saladtossser]

these are aluminum blanks, all sizes
http://www.jackssmallengines.com/index_ ... prktb.html

[Andrew52]

well i wouldnt go as low as 30 or 40 maybe like a 55ish 60 itherwise you would have little or no toruque

[saladtossser]

http://www.sadik.net/gokart/calc.htm

oh and i dont know about you, but i wouldn't go faster than the neibourhood speed limit, i planned mine to be 30 kph and the limit is 40 kph, so i use 12 teeth on the input, and 60 on the output

[schmanman]

I want to go 40-45 mph full throttle. I think for torque and speed,I will buy a torque converter. but not right away.It wil probobly be later this summer.

[jrrdw]

A smaller sproket on the axle will give you more take off power but the engine will wind out fast and your top speed will be slower, a bigger sproket on the axle will give you a slower take off but a slower wind out and a fast over all speed. T hats wht on motorcycles if you go smaller on the axle you go bigger on the engine and vice versa, you will still get the speed change but the effect on the engine will not be as severe. Do you know what i'm trying to say?

[schmanman]

yes,I understand. thanks for the advice. I'm ordering a torque converter from www.gokartsupply.com tommorow. It will be well worth it.

[Andrew52]

no if your rear sprocket is small u have a fast top speed slow take of and big sprocket fast take off slow top speed

[saladtossser]

http://www.bmikarts.com/shop/index.php? ... from=thumb
cheaper

[jrrdw]

Andrew52, think about it like this, it takes longer to turn a bigger sproket all the way around then it does a smaller one, there for, at top engine speed the bigger sproket will be makeing more revolitions, there for more top speed.

[schmanman]

the torque converter on www.gokartsupply.com has a cast,sturdy backplate,and fits number 41 chain.It is only $40 more. thanks for the link. that seems to be a good site to buy parts from