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This clutch has a 3.7" v-belt pulley. Like NEW! It has less than 5 minutes of use. I bought it for a home project on a dirt bike but had no idea about gear ratios and wound up buying another Hilliard clutch but one that has a small chain sprocket to get my gear ratio higher. It's in excellent...

You're using 3" for the clutch size but it's 4".

Guess what? Because of you guys...I have finally learned how to figure out gear ratios! Thank you!!! I really appreciate your time explaining it all. But if I go from the 5" JS in pulley to a 6"....my gear ratio will be 6:1 That will still not get that bike moving. With the ratio I have now at...

I'm not trying to challenge your experience but now there is a 5" pulley and I can't imagine going to just a 6" pulley would make barely any difference. The bike won't even move with me not on it. I don't need speed on this bike....it needs torque to run on the inclines on my property. Thanks.

I really appreciate your reply. You were doing good until the "overall ratio." This is where I can't get a grip on. How did you go from 1.25....4....and get 5:1??? Or should it be 5.25:1....so you always add the first and second ratios to get the final gear ratio?? Yeah....you're right about the...

So this is a worthless post huh! Why the **** do you think people post questions??? It's because they don't know the answers and don't have the experience as you know it alls. I started a new thread because I changed pulley sizes and added a jackshaft. I don't know how to do the math for gear...

*Clutch working but bike won't move.* In another thread I mentioned putting a 5hp Briggs in a dirt bike frame. I added a jackshaft. It's all pulleys...no sprockets. Engine strains...won't rev all the way up....and the Hilliard Heavy Duty centrifugal clutch tries to work but the bike won't move...

Good info. Thank you very much!!!!!!!

On a pulley that takes an A or B belt.....which belt really works better. The 1/2" A belt that sits down in from the top of the pulley....or the 5/8" B belt that sits flush with the upper edge of the pulley. Which belt grabs the pulley the best? Thanks.

Pulley on rear wheel....dirt bike. http://www.diygokarts.com/vb/attachment.php?attachmentid=62071&stc=1&d=14392http://www.diygokarts.com/vb/attachment.php?attachmentid=62072&stc=1&d=143924252142521

What I do is drill holes in the pulley where the original sprocket was bolted, then put original bolts back in and bolt it to the wheel hub. ok...tomorrow I will take a few pics.

I'll change that 4" pulley to a 3"....and change the rear wheel pulley to a 12", and looks like it might get the ratio up to 8-1. My property has some hills so I'll need that higher ratio. Now I have to construct a mount for the jackshaft. Thanks guys....I appreciate your input!

The website for the calculations only works with sprockets with teeth....not belt pulleys. After measuring...I can only add pulleys in this order.....3-6-4-9 inches. I have no idea how to figure out this gear ratio with 4 numbers. Two numbers I can do. And then if I still need more.....I will...

Thanks for the info! Smoke is coming out of my ears.

The rear tire is an 18". I found a place that has very short belts. Just talked to my friend and he said go from 3" engine clutch pulley to a 9" pulley on jackshaft, then from there go from a 3" pulley to the 9" pulley on rear wheel. I don't know how to figure out what the final gear ratio...

I put a 5hp briggs in a 250 rm dirt bike frame. I have a hilliard 3" (v-belt) centrifugal clutch on the engine shaft, and attached a 9" v-belt pulley on the rear wheel. Bike won't even move....gear ratio is way off. Guess I have to make a jackshaft. What size v-belt pulleys would I put on the...

It would be for riding off road. I am going to see if I can get a centrifugal clutch and add my own sprocket to it so it will match up to the big 520 chain. I would get the original front sprocket(11 teeth I think) that's for a 250 engine and could bolt or weld it to the centrifugal clutch. So...

I already have the 5hp briggs, plus I like the challenge. Makes sense about the size of the chain. Good point. But can someone answer my original question about what "centrifugal clutch" is recommended and of good quality? Thanks.

I'm going to fit a 5 hp Briggs engine on a 98 250 rm Suzuki dirt bike. Good luck right! What kind of centrifugal clutch would you guys recommend. Rear sprocket has 50 teeth. An adult will be riding this. No interest at this time to fabricate a jack shaft with torque converter. I appreciate your...