Clutches!?!?!?

[JDELPH88]

Hello Every One I Have My Barstool Together And It Runs Fine And Its Rather Quick With Just A Honda 5.5 Hp And The Stock Centrifrial Clutch. But I Want Some More.. But A Tav Will Not Fit Unless I Do Alot More Work And Fabricating And Really No Time To Do This. Well Anyways I'm Wanting To Know What If Any Other Options Are Availale?? Thanx Joe

[CritterBuddy]

Can you be a little more specific about what you want more of?

[JDELPH88]

Im Looking For More Torque, But I Dont Know Any Other Way To Do This Other Then A Tav Which Dont Fit.. So Really What Im Looking For Is Clutch Options.. Thanx Joe

[taintnpaint]

do u know where i can get a 20 mm clutch. Its for my Kymco 200cc engine. I guess its metric. Standard measurement is 0.78. Any ideas where to find this size?

[CritterBuddy]

In my mind when you say you want more torque I'm thinking you want a quicker start from a stand still. I believe there are 4 ways you can accomplish this.

1) A TAV2 will help you in this area as it will adjust itself to give you the best performace based on all the paramaters of your BSR (hp, gear ratio, load, etc.). Since a standard TAV2 will not fit under your stool you might consider using a separate driver and driven unit which basicly is the same as a TAV2 except you'll also have to run a jackshaft as the largest bore for the driven unit is 3/4" so it won't fit on your rear axle. Total cost would probably be around $225-$250.

2) A racing clutch will engage more solidly and has springs which can be changed out to raise the rpm at which it actually engages. This would eliminate most of the slipping you're probably experiencing with a standard centrifigul clutch but changing out the springs will also jerk the heck out of you at take off. Total cost would be around $100-$250 depending on the clutch you select.

3) A gearing change could be in order. Most centrificul clutches come with different size gears on them. In this case you'd want to go smaller on your clutch which would increase your gear ratio. Total cost around $35. Another option is to get a larger axle gear if you have enough ground clearance to also raise your gear ratio. Total cost around $20-$30.

4) And finally a tire change could be in order. Going to a smaller tire would increase your gear ratio. Sorry, can't predicte cost as I don't know what you're already running.

Food for thought.....

[Cosmikdebris]

I found this on Smokin Joe's website, a good piece of info.


Most racers know about gear ratio and gear ratio charts are listed in numerous places. Gear ratios are figured using rear gear divided by clutch gear. For example if you were running a 15t clutch gear and a 60t rear gear it would be 60 / 15=4. Simply put this means 1 revolution of the axle to 4 revolutions of the crank.
But in order to get a true picture of gear ratio one must use tire circumference in equation. If you run the same gears as someone else but you have 34" rear tire circuference and someone else has 36", the true ratios are not equal. To figure the true ratio you will want to use IPR(inches per revolution) which simply means the number of inches a kart will travel per each revolution of engine.
To figure IPR use this equation: Rear Tire Circumference(T) x clutch gear(C) divided by rear gear(R) = IPR. For example if one racer(Racer A) was running a 15t clutch gear with a 60t rear gear and their tires were 34" the equation would be 34 x 15 / 60 = 8.5. This means the kart would travel 8.5 inches per revolution of engine. If another racer(Racer B) had the same gears but had 36" tires look what happens. 36 x 15 / 60 = 9.0.
Even though both these racers were using the same gears they were not running an equal set-up. Racer A would be faster coming off the corners and Racer B would be faster down the straight. So what if Racer B wanted to run the same IPR as Racer A but still use the same tires? To figure that we can replace Racer B's 60 with Racer A's IPR. 36 x 15 / 8.5 = 63.52. This means that for things to be equal, Racer B would need to change their rear gear to a 63t or 64t.
So remember, if you ask someone what gears they are using and you don't also ask what size their tires are, you are wasting your time. Think IPR, not gear ratio. Here's a couple of links to use if you need a go kart racing clutch or rear sprockets. 4-Cycle Go Kart Clutches (http://stores.ebay.com/Smokin-Joe-Racing_4-Cycle-Go-Kart-Clutches_W0QQfsubZ16) Sprockets, Go Kart Chains (http://stores.ebay.com/Smokin-Joe-Racing_Sprockets-Go-Kart-Chains_W0QQfsubZ6)
http://www.feedburner.com/fb/images/pub/feed-icon32x32.png (http://feeds.feedburner.com/SmokinJoeRacing)