gear ratio for non-pedaling start

[5-7HEAVEN]

If. A 10 tooth sprocket on the motor with a 36 tooth sprocket on the wheel gives. About 35 mph with a gerar ratio of .278 and a 50 tooth sprocket on the wheel gives more hill climbing with a gear ratio of .20 what ratio do you think would allow standing starts with no pedaling for ur avg chinese 2-cycle?

Gear ratios calculate like this:

Engine has 83t/20t = 4.15:1 internal gears

36t/10t = 3.6:1

3.6 X 4.15 = 14.94:1

50t/10t = 5:1

5 X 4.15 = 20.75:1

Just so you know.

 

[Chalo]

well, one one of my bikes i have been taking off like that since last august (2009) when i first built it. i have about 150 miles on it, and the clutch is fine.

150 miles? Like an average of less than half a mile per day? Or do you mean 1500 miles?

Either way, I don't think you can characterize your setup as proven.

Chalo

 

[motorpsycho]

150 miles? Like an average of less than half a mile per day? Or do you mean 1500 miles?

Either way, I don't think you can characterize your setup as proven.

Chalo

yes...approx 150 miles, maybe 200 at the most.
I only ride my bikes for fun and i don't rely on them for every day transportation. I'll buzz them around my neighborhood,(maybe 1-2 miles at a time) or take them to a car or motorcycle show on occasion..that's about it.
i have 3 cars and 2 motorcycles, and there is no way that i would depend on a m.b. for every day transportation.
all i can say is that it works for me, and i will keep doing it the way i want.

 

[blckwlfny1]

Um..so what gear ratio do you think will produce a. StAnding start?

 

[Schwinn-Locura]

Um..so what gear ratio do you think will produce a. StAnding start?

It didn't work for me and I have the original 44t sprocket. I could start by pushing off with my foot a bit si it was close.

 

[motorpsycho]

It didn't work for me and I have the original 44t sprocket. I could start by pushing off with my foot a bit si it was close.

you have a 44 tooth sprocket with a 26" wheel, and that makes it a taller gear ratio (more for top speed). trying to take off from a stop with just the clutch on your bike is probably like trying to take off from a stop in 3rd gear with a car that has a manual 4 speed.
I am running a 41 tooth sprocket on a 20" wheel, which makes it a lower gear ratio. Maybe this is why it works so well for me...because i have 20" wheels, which makes the gear ratio lower.

 

[Schwinn-Locura]

you have a 44 tooth sprocket with a 26" wheel, and that makes it a taller gear ratio (more for top speed). trying to take off from a stop with just the clutch on your bike is probably like trying to take off from a stop in 3rd gear with a car that has a manual 4 speed.
I am running a 41 tooth sprocket on a 20" wheel, which makes it a lower gear ratio. Maybe this is why it works so well for me...because i have 20" wheels, which makes the gear ratio lower.

Yes, I plan on getting a 36 tooth sprocket. I will also be adding some horse power.

 

[5-7HEAVEN]

Ya Can't Have It Both...unless...

You want a gear ratio for non-pedaling start. You have a 44t sprocket, which does not work for you. Instead of lowering your gear ratio(higher decimal fraction), you're raising it(lower decimal fraction) with the intention of increasing horsepower.

You will NOT have a gear ratio for non-pedaling start.

What do you really want? Non-pedalling start, more hp and higher speed?

You want an SBP shift kit.

 

[Schwinn-Locura]

You want a gear ratio for non-pedaling start. You have a 44t sprocket, which does not work for you. Instead of lowering your gear ratio(higher decimal fraction), you're raising it(lower decimal fraction) with the intention of increasing horsepower.

You will NOT have a gear ratio for non-pedaling start.

What do you really want? Non-pedalling start, more hp and higher speed?

You want an SBP shift kit.

I wasn't looking for a non-pedling start. A little excersize will never kill yeah.

I'm all about speed, and already spent enough money. I will probley get something to shift in the future though.

 

[blckwlfny1]

Gear ratios calculate like this:

Engine has 83t/20t = 4.15:1 internal gears

36t/10t = 3.6:1

3.6 X 4.15 = 14.94:1

50t/10t = 5:1

5 X 4.15 = 20.75:1

Just so you know.

thank you.
assuing all internal gearing of the motor to be constant and the 10-tooth sprocket in the driveshaft to be a constant as well, the only variable in the gearing would be the wheel sprocket. it may not work for numeric hp and torque calculations off of the drive spline itself, but, any constant on both ends of a relative equasion can be cancelled out to simplfy the mathematics. ...And beleive me i can use all of the help i can get.
i wasnt so much interested in the numbers. just an opinion of what might push my but down the road .
Im trying to fabricate a mid-drive transmission (to preserve the coaster brake as well as the vintage left-hand-chain drive) and i will be trying to shoehorn sprockets into some tight spaces so i have to design it baed upon the size of the components. Soooo...I'd rather not base its low end upon some arbitrary number which i may have to change. Does anyone think the gearing equivalent of a 60 tooth sprocket (1:6) ratio) would do it ?