CVT Drive Sprockets....

[Youngbird]

Without implying any indications of disrespect or disappointment with the good folks at Thats Dax....I am wondering who else is selling a drive sprocket like DAX's 10 tooth, 6 sline sprocket. They seem to be tough to come by. Any suggestions?

[spad4me]

You have to make your own if you want to use bicycle chain, or buy dax's
I make my own by welding a thin thats dax happytime driven ten tooth sprocket to a well ground down cvt sprocket.


Or just use scooter size chain and components a scooter rear sprocket a Number 8 chain and the stock scooter cvt drive sprocket.
If you could buy the dax transmission output sprocket ( he is still sold out )It would fit with only a small amount of trimming.
If you try the flat universal sprocket try to trim it carefully.

[Youngbird]

The flat universal sprocket....is that the one that is really soft? Needs to be heated and quenched to harden? Thats an option....but Id prefer to have the other one....seems to be harder and more applicable to this cause.

Im considerinf the size 8 components, but I need to be able to get a rear sprocket to fit a S/A 3sp. internal hub. Im waiting to hear from Andy now.

Its all an adventure from where I sit.*

Ive got the rear wheel sprocket figured. MonsterScooter had a 54 tooth with the proper diameter hub hole and the S/A 22 tooth has slots in it so I can drill the 54 tooth to bolt up to the S/A. So far Im only finding a 20 drive sprocket for the CVT. Still gotta work on the gear ratio. Maybe a larger rear wheel sprocket.

[Youngbird]

I got my CVT yesterday via FedEx. The lovely Linda @FancyScooters shipped as promised and it traveled the 150 miles from Pennsauken,NJ to Longneck, DE in about 2 days. Im impressed.

Im also impressed with the size of the unit....its really quite small. Sturdy feeling though. I also verified it to be about a 6.5:1 ratio turning the cluth bell by hand.

Next step is to see DAX about a Titan and its off to the races.*

*Another issue....If Im right I need a total overall reduction of about 18.5-20:1 to make this all work right. With 6.5:1 in the CVT then it seems I nees about 3:1 between the CVT drive sprocket and the rear wheel sprocket. Can anyone verify this for me before I jump off and buy parts?

[Nuttsy]

Youngbird,
Don't go by the 7:1 or your 6.5:1 ratio in figuring your gearing. That is what the ratio is when the clutch 1st engages and the belt starts to turn. Once the RPM's come up, the ratio starts to go toward the 3:1 or if you're lucky, 2.5:1. That is the number you should use to figure your final, top speed gearing.
Also, your final ratio will depend on how much RPMs your engine will develop and how the CVT interacts with those RPMs. Then you can get into tuning and such and that's just trial and error.
My experience was to go with 4.5 to 5:1 final gearing.
Good luck...enjoy!
WC

[Youngbird]

So, if Im reading this right here....I need the 5:1 between the CVT output sprocket and the final(rearwheel) drive....ie: 10 tooth on the CVT and48-54 on the rear wheel, correct?

[loquin]

Exactly. With the one I'm designing, I want a freewheel, so I'm adding a jackshaft and a freewheel as the output sprocket on the jackshaft.

[stude13]

how about with a 24" wheel and an 18 tooth on my belt drive cvt? my motor pulls 11,000+ and i only want 25mph. is that enough info or too much? thanks mitch

[Youngbird]

Wow....what motor do you have that kicks 11,000 rpm?

[stude13]

49cc polini and the reason for the speed, it going on a tipsy trike.