Speed vs Torque

[FrizzleFried]

I am currently running a 40 tooth sprocket on the rear. Being a larger guy (280lbsish), I figured that might be the smallest sprocket I'd want to go on the rear.

As I am toying with my motor, it's obvious that I'm not going to push it much beyond her max speed at this point... which is 33.4mph. Sure... I bet I could hit 34mph... and I MIGHT be able to push it to 35mph, but that's all she's got..

I assume that if I went to a 36 tooth sprocket... I could add 10% to the top end speed... 37mphish... but at what cost to the low end? Am I going to see/feel a noticeable difference in torque going from a 40 to 36 tooth? To be honest... at this point, I think I'm there... I'm not sure if any gain going forward is going to be worth the cost/effort.

One thing this little hobby has gotten me involved in is looking for a tiny street-legal enduro to play around with. I've set my budget for $750... if I can pick up a project enduro for under $750 I'm gunna pull the trigger.

I was VERY close to picking up an old 1976 Honda 200 enduro the other day... it's just a little rich for what I have to play with right now at $1000...

EDIT: Now this is interesting... but maybe a little bit more than I wanna chew. This 1969 Suzuki is available about an hour from me for $400. Non-working but they do have all the parts.

 

[darwin]

Zooki is going to be hard to find parts for, Hondog will have better parts available.

 

[Wrench]

That's a $100 bike

You can find those old Jap small 2 strokes from the early 70s running for $200

If ya got $1K to play with go buy a used 250cc Honda Rebel or a 250cc Yamaha Virago Star, Those bike will run forever

 

[motoredjosh]

thats a motorcycle what cc is the engine? it might just die from a dead stop

 

[Wrench]

1969 Suzuki 120cc
That bike is missing more parts than it's worth

 

[Chainlube]

1969 Suzuki 120cc
That bike is missing more parts than it's worth

I could make something out of it, but now for $400, maybe 100.

 

[Chainlube]

1969 Suzuki 120cc
That bike is missing more parts than it's worth

Ha ha, I bought a GY6 150 quad for 50.

 

[Sidewinder Jerry]

I am currently running a 40 tooth sprocket on the rear. Being a larger guy (280lbsish), I figured that might be the smallest sprocket I'd want to go on the rear.

As I am toying with my motor, it's obvious that I'm not going to push it much beyond her max speed at this point... which is 33.4mph. Sure... I bet I could hit 34mph... and I MIGHT be able to push it to 35mph, but that's all she's got..

I assume that if I went to a 36 tooth sprocket... I could add 10% to the top end speed... 37mphish... but at what cost to the low end? Am I going to see/feel a noticeable difference in torque going from a 40 to 36 tooth? To be honest... at this point, I think I'm there... I'm not sure if any gain going forward is going to be worth the cost/effort.

One thing this little hobby has gotten me involved in is looking for a tiny street-legal enduro to play around with. I've set my budget for $750... if I can pick up a project enduro for under $750 I'm gunna pull the trigger.

I was VERY close to picking up an old 1976 Honda 200 enduro the other day... it's just a little rich for what I have to play with right now at $1000...

EDIT: Now this is interesting... but maybe a little bit more than I wanna chew. This 1969 Suzuki is available about an hour from me for $400. Non-working but they do have all the parts.

Here's how ratios often work. I have a shifter bike and can shift 9 sequential non-redundant ratios. If I'm on level ground at WOT doing 7000 rpm and shift to a higher gear ratio I won't go any faster. What'll happen is my speed stays the same but the rpm drops due to engine strain.

 

[Deleted Member 4613]

Never buy anything that doesn't run!!

 

[noah9988]

You can find those old Jap small 2 strokes from the early 70s running for $200

What? They're worth more than that in parts. I haven't seen a running one for less than 900 where I am.