Crosshair_84
Member
- Local time
- 10:03 PM
- Joined
- Sep 22, 2011
- Messages
- 38
My bike had been put together with a rear wheel 7/8" Staton friction drive with a Tanaka 32cc Engine. I can get about 21-22 mph out of it. I upgraded to a used 40cc and I put in the 1 1/8" that I have for a project I have not gotten to. However, the speed decreased to about 18-19 mph. I then swapped back to the 7/8" roller and I can get up to about 20-21 mph. However, my acceleration has picked up substantially. I don't really need to pedal once I get going.
I am a big guy and weigh about 270 pounds, but it's very flat where I live.
I checked the power curves and think that I have found the problem. The 32cc doesn't have good torque figures vs the 40cc, but it puts out max power right where I need it to get top speed, around 8500 RPM, while the 40cc puts out max power about 2,000 rpms sooner, 6500 rpm.
http://www.tanakapowerequipment.com/pdf/PF_3300_Info.pdf
http://www.tanakapowerequipment.com/pdf/PF_4000_Info.pdf
At first I was disappointed with not getting any higher speed, but after riding it a bit, the extra acceleration certainly does come in handy, especially in areas with lots of stop signs where I need to get going back up to speed.
So it looks like I still don't have enough power to swing the 1 1/8" roller and I've traded about one mph of top speed in exchange for better acceleration.
Is this about the performance I should be seeing or is there perhaps something wrong with my setup or the engine? The 40cc was broken in when I bought it.
/Thanks everyone.
I am a big guy and weigh about 270 pounds, but it's very flat where I live.
I checked the power curves and think that I have found the problem. The 32cc doesn't have good torque figures vs the 40cc, but it puts out max power right where I need it to get top speed, around 8500 RPM, while the 40cc puts out max power about 2,000 rpms sooner, 6500 rpm.
http://www.tanakapowerequipment.com/pdf/PF_3300_Info.pdf
http://www.tanakapowerequipment.com/pdf/PF_4000_Info.pdf
At first I was disappointed with not getting any higher speed, but after riding it a bit, the extra acceleration certainly does come in handy, especially in areas with lots of stop signs where I need to get going back up to speed.
So it looks like I still don't have enough power to swing the 1 1/8" roller and I've traded about one mph of top speed in exchange for better acceleration.
Is this about the performance I should be seeing or is there perhaps something wrong with my setup or the engine? The 40cc was broken in when I bought it.
/Thanks everyone.