newbe needs help

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fng kart guy

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I got a go kart from a friend. Im familiar with engine workings. I rebuilt engine and carb. Got it up and running. Soon noticed the clutch was bad. Did a quick internet search for a centrifugal clutch for the engine i have, and ordered. Put it on. Took it for a spin. Immediately heard noises coming from clutch. Soon it would not even move kart. Yes, I know, Im an idiot! Either I got a defective clutch or the wrong kind.
I would like some help. Please! The engine is a Predator 212cc. The old clutch was a ten sprocket. I would appreciate some in sight on quality clutches and a suggestion of model. Engines specs say idle rpm is 1800+500. Top Rpm is 3600. 6.5 hp. Thanks for the Help.
 
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fng kart guy

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Thanks for responding. I will get info. Dont know the weight. Can get picts. Im about 200 lbs. But if I put my foot in front of back tire and hit gas. I can hear and see clutch is slipping. Make a metal on metal slipping sound. I can hold kart back with foot, and no weight is on kart.

---------- Post added at 04:47 PM ---------- Previous post was at 04:20 PM ----------

Sorry dont know how to post picks. The back tires diameter is 11.5 inches by 8 inches wide. The flywheel Diameter is 10 inches, with 60 sprockets. The clutch has 10 sprockets. With a diameter of 1.75 inches sprocket to sprocket. I can lift the kart into truck. Best guess is 100 lbs.
Really appreciate the help.
 
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Did you oil the clutch after you installed it??
Needs oil from the start, just a few drops every 2hr of use...


Justa a few things on terminology...
The clutch has a sprocket, that has teeth to engage the chain......
The flywheel... is inside the cover of the motor...

Typically with toothed sprockets, the gearing or gear ratio, is determined by tooth count of both, or a combined amount of many sprockets(like on a jackshaft) in the drivetrain.

Edit:Sid... he doesnt say anything about a TC being used???
 
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fng kart guy

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I did not oil clutch. After I heard the noise and it would not move. I investigated about adjusting and oiling clutch. None of them talked about the type I have. They all warned about getting oil on to the clutch contacts. Or about an oil hole. Which the clutch does not have. No adjustment screw or oil hole.

mckutzy said:
Did you oil the clutch after you installed it??
Needs oil from the start, just a few drops every 2hr of use...


Justa a few things on terminology...
The clutch has a sprocket, that has teeth to engage the chain......
The flywheel... is inside the cover of the motor...

Typically with toothed sprockets, the gearing or gear ratio, is determined by tooth count of both, or a combined amount of many sprockets(like on a jackshaft) in the drivetrain.

Edit:Sid... he doesnt say anything about a TC being used???
Click to expand...
 
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If you can, we are going to need some pics. What type of clutch was it? How did you install it? Is the pitch of the clutch sprocket the same as your axle sprocket?
 
Nosandwich

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You guys are better at this than me. Can we show him WHERE to oil the clutch?

Maybe talk about chain tightness?

Or how to post pics?
 
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mckutzy

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On pics...
http://www.diygokarts.com/vb/showthread.php?t=737'

And oil( a standard clutch however)...

 
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fng kart guy

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Here are some picts. Will get up close picts of clutch tonight.
The Clutch is a Ktaxon CVT Centrifugal Clutch
 

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mckutzy

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That appears to be a live axle...

What you have on your kart is a Centrifugal clutch....Not a TC(or AKA Torque Converter)

This is a TC...

 
bob58o

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Gearing and tire size seem fine.
Unless the driver is much over 200 lbs, it should be ok???
The whole kart with driver can't be much over 325lbs?

If the clutch engages at 1800, set idle at like 1600 RPM.
Shouldn't have a problem idling at 1600 RPM (I don't think).
Honda's say they idle at like 1400 RPM IIRC.

---------- Post added at 03:11 PM ---------- Previous post was at 02:49 PM ----------

Well if at 350lbs total weight, the formula I made up (without testing) says you should be ok at 6.1:1. Which means I think it should be ok, but have no evidence to support it. I never even used a CC on any of my toys.

If the kart, engine, wheels, driver is around 400 lbs, you might want to use a 7:1 gear ratio instead of the 6:1 you have now. If you drive on hills, a 7:1 or 8:1 would help bit too. If you do a lot of stop and go, again 7 or 8:1 would be better. Just remember if you increase the rear sprocket size to help the low end and increase clutch life, you will decrease max speed.

For what it's worth...

For 5-7HP Engines Using C Clutches...
GR = Gear Ratio
D = Tire Diameter in Inches
T = Peak Engine Torque in Lb-Ft
W = Total Weight (Vehicle plus Passengers) in Lbs

GR = 0.01179 * W * D / T
 
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