Coleman CT100 79cc engine in a Schwinn Stingray Chopper?

[michael whiteman]

I'm not sure how the pedals will work with the 142F but I do feel you'll have the same issues I did with my Predator. (explained in my thread) I've shared this speed calculator many times and recommend copying it to your document folder for future use. Insert these numbers and see if you like the mph results. 20 - 100 - 10 - 44 - 22.38" tire circumferance. BTW: there is a 80T belt pulley available along with some sprockets larger than 10T.

Motor and Gear Ratio Guide and Calculator for Vehicles with a Jackshaft - ElectricScooterParts.com

Electric scooter with jackshaft motor and gear ratio guide with gear ratio calculator.

electricscooterparts.com

 

[MuayThaiJJ]

@michael whiteman I am thinking of a 79cc or 98cc still. My rear wheel has a 415 sprocket and chain. I see that these pedator 79cc and Titan 98cc engines use centrifugal clutches with sprockets to turn the chain. The smallest I can find is a clutch for 420. Can I use (my existing) 415 or (new) 420 chain on this setup? thanks

 

[michael whiteman]

Here is a chain chart that you might want to copy and save also.

 

[michael whiteman]

In post #11 I was assuming that your 142f came in a kit which had a belt drive trany and a chain to the wheel sprocket. If this is not the case you're going to have to design the complete drive system like I did. You will not find a clutch that fits the 15mm straight shaft on that HauShang engine. There is a sleeve that slides on it which will allow you to use a 5/8" bore clutch.

Like I've stated many times in other threads: most wheel sprockets are intended for #415 chains. Therefore the drive sprocket must match. Stanton Inc. is the only place to buy these. As the chart above shows, a #41 chain will work on the large wheel sprocket but has a little sideways slop. A #40 chain will too, but it's really sloppy. I tell you this so you can have some other choices on the drive sprocket.

I think the aluminum jack shaft plate I used will bolt onto the HauShang but then I'm not sure how far the shaft will stick out. You will need to know if it's far enough to support the clutch you want.

 

[michael whiteman]

@michael whiteman I am thinking of a 79cc or 98cc still. My rear wheel has a 415 sprocket and chain. I see that these pedator 79cc and Titan 98cc engines use centrifugal clutches with sprockets to turn the chain. The smallest I can find is a clutch for 420. Can I use (my existing) 415 or (new) 420 chain on this setup? thanks

I guess we're back considering the Predator. I can only assume the 98cc has the same shaft as the 79cc. If you use this engine you will need a jackshaft or a CVT trany.

I want to stop you right here because we seem to be going around in circles. I really want to help you because you sound just like me when I first contemplated this same build. You need to make-- and tell me-- some hard decisions so we can head down the right path. I need to know what are your desires for this bike. How fast do you want to ride at a steady speed? How fast at wide open throttle? I think you're gonna stay on the street and not go trail riding, correct? Will you be encountering any hills, and if so, how steep and long are they? I can not process this info until you make up your mind on which engine you will ultimately use. When I know all this I can direct you more precisely.

 

[MuayThaiJJ]

Yes, just the road and some moderately steep hills

 

[michael whiteman]

You need to answer ALL my questions, not just two, or we're gonna waste a lot of time back and forth. They are all necessary for me to give you correct answers.

 

[MuayThaiJJ]

Sorry Michael, was in a morning rush.
- roads only
- some steep hills
- I'd like to keep pedaling intact, wondering if both an extended crank shaft and angled crank arms would do it.
- speed isn't a huge deal, I am fine with 20-25mph, just would like some uphill help.

So far I have purchased a 142F and I am not happy with how long the output shaft sprocket is. I also have a 144F coming to me to compare, the picture shows the sprocket location is in a nicer location to align with the rear wheel sprocket. I came across a crazy deal for a new 98cc Titan TX100 for $60. I think all it needs is a centrifugal clutch. Specs say it is identical in size to the Predator 79cc, I am considering getting it just cuz it's so cheap. Once I have all 3 engines in front of me, I guess I can decide what can fit the easiest.

Addendum: I ended up ordering this 100cc 4-stroke kit too just to see how it would possibly work. I will return the 2 engine kits I decide to not use.

 

[Gordy]

Sorry Michael, was in a morning rush.
- roads only
- some steep hills
- I'd like to keep pedaling intact, wondering if both an extended crank shaft and angled crank arms would do it.
- speed isn't a huge deal, I am fine with 20-25mph, just would like some uphill help.

So far I have purchased a 142F and I am not happy with how far the output shaft sprocket is. I also have a 144F coming to me to compare, the picture shows the sprocket location is in a nicer space. I came across a crazy deal for a new 98cc Titan TX100 for $60. I think all it needs is a centrifugal clutch. Specs say it is identical in size to the Predator 79cc, I am considering getting it just cuz it's so cheap. Once I have all 3 engines in front of me, I guess I can decide what can fit the easiest.

The pedal sprocket it the major issue. It won't clear the engine case

 

[MuayThaiJJ]

The pedal sprocket it the major issue. It won't clear the engine case

Would it work if the sprocket is extended out with the longer crank shaft?