CVT Full Suspension CVT

[kerf]

Having finished my latest incarnation of the Snake Eater and having put about 60 miles on it, I can absolutely say I no longer have an MB. This thing has crossed the line to moped or motorcycle or something. Never in all my builds, have I ever had this combination of hill climbing ability and super cruise. Guess I may get booted off the forum for good.

For this build, I wanted speed, power, quite and a smooth vibration free ride. To that end, I used the CVT rubber mounts and added rubber isolators at all other mounting points. The power is routed from the CVT through a 14 tooth sprocket, down to a 72 tooth freewheel sprocket on the wheel. The chain is 8MM, which seemed to be the easiest way to go. I bought a scooter muffler but wasn't happy with the chain saw sound. I gutted the muffler, added about 4" of length to the housing and created a straight through glass pack, with a spiral baffle inside the the core tube. Since I had been running a Staton chain drive, my Staton rear hub had a 16 tooth left hand freewheel. I just pulled down the bottom bracket and swapped the pedal chain to the left side. A quick idler roller and it works like factory, single speed of course.

I'm still playing with gear ratios, to find the optimum and I ordered an 11 tooth trans. sprocket this morning. The story of gear ratios goes like this, my old Staton box was geared at 18.75:1 and my chain drive was 1:1, giving me a final drive ratio of 18.75:1 and it let the R460 breathe real good. Before the build I checked the CVT and found the gear box was 3.71:1 and the belt was 1.89:1 in low range, giving me a 7.0:1 total in low range. I could only estimate the belt in high range and I thought 1:1 looked pretty close, giving me a total of 3.71:1 in high range. I just clocked the bike at 35 MPH and it was turning 6550 RPM, so backing into the numbers, the belt looks to be closer to .775:1 in high. That makes a huge difference.

Here are the final ratios available to me:

Trans. high range 2.875:1 - chain 14/72 = 14.79:1 final. (running that now)

The 11 tooth trans. sprocket will make this available.

Trans. high range 2.875:1 - chain 11/72 = 18.82:1 final.

Trans. high range 2.875:1 - chain 11/63 = 16.47:1 final.

Man, what a rush!

 

[professor]

You sure do nice work Kerf. Looks factory.

 

[kerf]

Thanks professor. This thing has been in my head for more than three years. I even bought a transmission several years ago and finally returned it because of technical issues. It was TREEWK that put me on the right track with his build.

http://www.motoredbikes.com/showthread.php?t=18548&page=9
Post #86


About 4 months ago, I bought another trans. and began accumulating materials and parts. Finally I had the time and just decided to take the plunge. Had to ride the wife's bike for a couple of weeks but it all worked out.

 

[eastwoodo4]

nice job.would love to take it for a ride.

 

[Turtle Tedd]

...Outstanding......

 

[GearNut]

Very well done indeed! I like your attention to detail, and the bass ackwards pedal system.
What is the oil filter looking device attached to the air box for?

 

[kerf]

Very well done indeed! I like your attention to detail, and the bass ackwards pedal system.
What is the oil filter looking device attached to the air box for?

Air filter, the original one that came with the engine.

 

[Alaskavan]

Nice work Kerf. That would probly be a good reliable commuter.

 

[loquin]

Very nice, Kerf...

 

[ibdennyak]

Nah, we won't boot you for building a .......moped. Some of us have one too. Sides, it's automatic....still fits the description.

Couple questions......I'm curious about your muffler. Always interested in the quest for quiet. Also, where did you get your CVT. I have an idea kicking around for a full suspension stretch, and looking for an alternative to a Nu Vinci. I used to have a scooter site that carried them, but they don't anymore.

Nice job by the way......I like it.