We do not have any sprockets for #25 chain that fit the Dirt Quad's motor except for the original 25 tooth sprocket.
However we do have a 9 tooth sprocket that will fit the Dirt Quad motor that is for 1/2" x 1/8" bicycle chain. We also have a 36 tooth sprocket for 1/2" x 1/8" bicycle chain which along with the 9 tooth motor sprocket would provide the right gear ratio for a 4 MPH top speed. The 36 tooth bicycle chain sprocket would not bolt onto the Dirt Quad's axle hub that the original 44 tooth sprocket bolts onto though, so it would need to be bolted onto the side of the original 44 tooth sprocket, or machined to fit the axle hub.
Here are part numbers and links to these parts:
9 tooth item # CTE-24364 and 36 tooth item # SPR-B36 bicycle chain sprockets: http://www.electricscooterparts.com/bicyclesprockets.html
1/2" x 1/8" bicycle chain and master links: http://www.electricscooterparts.com/bicyclechain.html
Please let me know if you have any questions.
Hello, I am looking to do this conversion also. I am wanting to set this up to haul a fishing Kayak. The Kayak is 14ft long with a trolling motor set up. Fully rigged I am looking at roughly 160 lbs. I would also be doing the conversion mentioned above to increase the torque and reduce top speed. Do you think this setup would be capable of hauling a Kayak of this length and weight through the sand? Are you using the stock tires or did you change them out to a balloon style tire. Steering is going to be an issue if I move forward with this due to the length of my Kayak, not sure how to set that up yet. I did see a remote control conversion kit that seemed like it would work well but I have to do some more research on that idea. Any advice would be greatly appreciated.