I have a simple single wheel drive go kart that needs a new clutch but before i go and buy one i want to get some opinions on which one to get. The bad clutch that is on it now is a 10tooth centrifigul clutch and the sprocket is a 54 tooth. The one on it now is a hillard clutch but i do not care what brand new one is. The engine is a 6.5hp blue harbor freight engine. Any suggestions?
what clutch?
- Thread starter bpred69
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Doc Sprocket
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Before you go clutch shopping, it would help to know why you need a new one. If there is a problem that led to clutch failure, now would be the time to diagnose it.
Russ2251
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A drop of oil can make all the difference.Well whenever i take the choke off of the engine when the motor has been running the clutch engages and the go kart starts driving away. Plus the clutch has a ton of play in it and the hole clutch wobbles around the shaft that goes over the drive shaft. Is that sort of wobble normal?
Well, clutches are specifically designed to engage when engine RPMs increase. It sounds to me like simply lowering your idle speed will make it work properly again.
For a harbor freight 6.5, stand behind the engine at look at the carburetor... near the top of the carb (not air box) you should see a little black plastic flap (the throttle butterfly) that can pivot, and has a wire on it coming from the throttle assembly... there should also be a plastic screw on your side of that butterfly that the throttle butterfly sits against when it's not being pulled open, so it stays open a bit to idle. Mine had a round cover that I had to pop off with a knife to expose a phillips socket on the head... barely took any force, knife was just to dig in a bit and get a grip. Back this screw out (counterclockwise) to lower the idle speed.
For a harbor freight 6.5, stand behind the engine at look at the carburetor... near the top of the carb (not air box) you should see a little black plastic flap (the throttle butterfly) that can pivot, and has a wire on it coming from the throttle assembly... there should also be a plastic screw on your side of that butterfly that the throttle butterfly sits against when it's not being pulled open, so it stays open a bit to idle. Mine had a round cover that I had to pop off with a knife to expose a phillips socket on the head... barely took any force, knife was just to dig in a bit and get a grip. Back this screw out (counterclockwise) to lower the idle speed.
Jmiller_usmc@yahoo.com
New member
the wobble is from the brass or bronze bushing is bad you can get a new one at tsc
So I loosened up the screw on the throttle butterfly but the butterfly takes a while to get back to the position that makes the engine idle so when im riding my go kart I have to hold the breaks in super hard every time i want to even slow down. It seems really dangerous. im thinking of running a spring from the butterfly so that the spring forced the butterly back to idle when i let go of the throttle. what are some thoughts?
Is the clutch engaging properly now?
Check to make sure your throttle arm is returning properly... if it's not, check the locknut that holds it to the engine to make sure it's not too tight. Make sure the throttle arm and the cable are properly lubed if required. Also, you may want to invest the dollar to get yourself a stronger return spring.
If the throttle arm is returning but the butterfly is not, make sure the butterfly can move freely and easily on its own. If it can, you may have a damaged linkage or stretched spring. Oiling it very lightly, with a light oil may help if it doesn't move very freely.
Adjusting the idle speed should not cause that problem.
Check to make sure your throttle arm is returning properly... if it's not, check the locknut that holds it to the engine to make sure it's not too tight. Make sure the throttle arm and the cable are properly lubed if required. Also, you may want to invest the dollar to get yourself a stronger return spring.
If the throttle arm is returning but the butterfly is not, make sure the butterfly can move freely and easily on its own. If it can, you may have a damaged linkage or stretched spring. Oiling it very lightly, with a light oil may help if it doesn't move very freely.
Adjusting the idle speed should not cause that problem.
So it turns out that my throttle cable was interfearing with the idle spring and not letting it go back to idle so i moved my throttle out of the way and everything worked great. I was riding it around and my chain flew apart which was no surprise to me because the chain was so old. But now I really need to order the new clutch that I have been wanting and a chain. The old chain was a 41 I believe but it didnt seem to fit my 54 tooth sprocket all that well. What clutch and chain combo should I get?
Doc Sprocket
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The clutch is just crappy. It is missing the bushing that keeps it from wobbling, its missing the set srew so i had to fab my own, its been sitting outside for years without oil, I just have decided to replace it. I got the frame and everything but the motor for free so i dont mind spending a little to get a new clutch. It would cost about as much to buy and pay for shipping on the parts needed for it. It will make a good spare. So im thinking of getting a 12 tooth with the correct bore and then some 40 chain. Do i measure the inside of the clutch i have to determine the new clutch or do i measure the outside of the axle?
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