Another Harbor Freight Attempt
- Thread starter MaxPower
- Start date
Ok I found the product I have been looking for and you may be able to use it to help with your reduction. One way sprocket clutch
With the 15t one way sprocket and the 176t timing belt pulley your top speed would be 48mph.
With the 15t one way sprocket and the 176t timing belt pulley your top speed would be 48mph.
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that is a really cool find. Do you mean to mount the 15t sprocket on the engine shaft? Is it a clutch that will engage at a certain RPM? It would be awsome if they could make a custom one way 176t pulley. that way when i pedal it wouldn't turn the clutch bell.
This is what I'm using on the pedal side of my bike. Motorized Bicycles Detail Page first you put on a 3 prong sprocket then screw on a freewheel. It's slick.
If anyone has a lead on large timing belts let me know. I've emailed pfeifer industries for a price but haven't received a reply. I might just give them a call. Custom=$$$
the smallest I can go is 18t due to the chain stay interference. even that's cutting it close. I'm also having second thoughts about the strength of the chain with the torque of the greyhound. It does fine with the 2 stroke.
I just got off the phone with Jim Donovan Jr of Pfeifer Industries and he suggested that a belt would not work well for this project. He said that the distance would be too great and a tensioner would not be effective. In addition, he quoted me $85 for a 176t timing belt pulley. Thats out of my budget. He suggested using a chain and I agreed. I can cut a chain to any length and it seems like a simpler task.
I want to use a standard bicycle chain from the clutch to the jackshaft input. I think a 415 chain is just too heavy duty. the weakest link is the 7-speed chain driving the wheel so if the drive system breaks then it will be there. a 415 chain is overkill.
I now have to find a clutch that has a 1 /2” pitch and is 1/8” wide. I know Max-torque makes one for a #40 chain but it’s too wide for a standard bike chain. I may have to get a machinist to mill it down. I think I’ll have to do the same for the large sprocket. Tips accepted.
I want to use a standard bicycle chain from the clutch to the jackshaft input. I think a 415 chain is just too heavy duty. the weakest link is the 7-speed chain driving the wheel so if the drive system breaks then it will be there. a 415 chain is overkill.
I now have to find a clutch that has a 1 /2” pitch and is 1/8” wide. I know Max-torque makes one for a #40 chain but it’s too wide for a standard bike chain. I may have to get a machinist to mill it down. I think I’ll have to do the same for the large sprocket. Tips accepted.
You should check what chain manufacturers say about those chain sizes.
for example The Complete Guide to Chain
for example The Complete Guide to Chain
Are you talkin to me or him? If you are talking to me I think I need the idiots guide to chains because thats a little over my head. 
Then again it could be because its past my bed time. I will try and read it tomorrow. If I don't get anything out of it then maybe you can tell me what I am missing. lol
Ok so for some reason when I was reading earlier I got down around chapter 4 and couldn't get out. This is some great reading thanks.
Then again it could be because its past my bed time. I will try and read it tomorrow. If I don't get anything out of it then maybe you can tell me what I am missing. lolOk so for some reason when I was reading earlier I got down around chapter 4 and couldn't get out. This is some great reading thanks.
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I just got a rain check for a greyhound. on sale for 89.99 plus a 20% coupon brings a grand total of 62 dollars. I think the engine will be the cheapest part of this project. lol. I expected to pay the retail of 109.99 but I guess I lucked out. The manager said that they would get them in next week. The only thing is that I have to drive an hour and half to pick it up in Tucson. I'll make a day of it. Maybe do some motoring on my POS mountain bike. anyone want to meet at harbor freight for a ride?
on sale for 89.99 plus a 20% coupon brings a grand total of 62 dollars. I think the engine will be the cheapest part of this project. lol. I expected to pay the retail of 109.99 but I guess I lucked out. The manager said that they would get them in next week. The only thing is that I have to drive an hour and half to pick it up in Tucson. I'll make a day of it. Maybe do some motoring on my POS mountain bike. anyone want to meet at harbor freight for a ride?
Going up to the Harbor Freight in Tucson tommarrow to pick up the motor. yay. I'm going to do some cruising up there on my bike too. It's going to be a good weekend.
tyrslider: do you have any clutches for sale? Did you get yours special order from max-torque? I'm thinking about this one Centrifugal Clutch for Go Kart and Mini Bike Old School Yerf-Dog Taco Rupp Manco any objections? It engages at 2000 RPM
tyrslider: do you have any clutches for sale? Did you get yours special order from max-torque? I'm thinking about this one Centrifugal Clutch for Go Kart and Mini Bike Old School Yerf-Dog Taco Rupp Manco any objections? It engages at 2000 RPM
Which HF are you going to be at Max? And around what time?I just got a rain check for a greyhound.
5570 East 22nd Street. I'll be there at 11:00. I just called them and they have 4 left.
Hi Maxpower,
Please consider the following.........
The HF motor normally idles around 900 RPMs [800 to 1000], the clutch you are considering engages at approx 2000 RPMs. The motor normally operates between 800 and 3600 RPMs, meaning you will need to rev from 900 [approx] to 2000 RPMs before the clutch engages. The span from idle to engagement is over 1000 RPMs [a lot!], and is almost 1/3rd of the entire range. The clutch you referenced is also chain drive [#35] output.
We had MaxTorque design a special clutch for us to engage within a few hundred RPMs off idle after we divided the motor output to our clutch, therefore a stock "over the counter" unit just won't work correctly.
If you use the clutch referenced and use the chain drive from the motor to the wheel without a drive system in the center the needed rear sprocket would have to have at least 66 teeth to end up with an 6 X 1 ratio [I doubt you will climb many, if any hills, or pull a heavy rider at that ratio].
Keep us posted on your progress.
Have fun,
Please consider the following.........
The HF motor normally idles around 900 RPMs [800 to 1000], the clutch you are considering engages at approx 2000 RPMs. The motor normally operates between 800 and 3600 RPMs, meaning you will need to rev from 900 [approx] to 2000 RPMs before the clutch engages. The span from idle to engagement is over 1000 RPMs [a lot!], and is almost 1/3rd of the entire range. The clutch you referenced is also chain drive [#35] output.
We had MaxTorque design a special clutch for us to engage within a few hundred RPMs off idle after we divided the motor output to our clutch, therefore a stock "over the counter" unit just won't work correctly.
If you use the clutch referenced and use the chain drive from the motor to the wheel without a drive system in the center the needed rear sprocket would have to have at least 66 teeth to end up with an 6 X 1 ratio [I doubt you will climb many, if any hills, or pull a heavy rider at that ratio].
Keep us posted on your progress.
Have fun,
Do you sell the special clutch? If I ask max-torque for one will they know what I'm talking about?
I made an excel spredsheet of various gear ratios I need. check out the screen shot. I think I've narrowed it down to a 80 tooth sprocket. I even found a place that sells the sprocket. Sprockets for Go Karts Mini Bikes : Sprocket Kart Bike Gocart Gokart Gocarts Gokarts
Their supplier is a place called Azusa. I'm going to call Azusa and see if i can buy it direct.
Sprockets for Go Karts Mini Bikes : Sprocket Kart Bike Gocart Gokart Gocarts GokartsTheir supplier is a place called Azusa. I'm going to call Azusa and see if i can buy it direct.
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Max, awesome link TY. Wait until you see the GH engine, really cool.
Looking forward to seeing her done!
Looking forward to seeing her done!
Max,
Investigate this clutch. Many options for chain size and engagement speed.
Tyreslider,
Thanks for that chain reference (link) on the last page. Awesome info there.
WC
http://www.mfgsupply.com/m/c/H5841.html?id=ieWVxUA8
Investigate this clutch. Many options for chain size and engagement speed.
Tyreslider,
Thanks for that chain reference (link) on the last page. Awesome info there.
WC
http://www.mfgsupply.com/m/c/H5841.html?id=ieWVxUA8
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Max I have a couple brand new max torque #35 11t clutches I'd be happy to sell cheap. They sell a 1450 rpm engagement spring for I think $6. It works perfectly as both my greyhounds idle at around 1200 rpms. Also Hilliard sells clutchtes that'll work and they have 1000 rpm springs. Evan FBC.
Don't Believe Everything You Think!
Don't Believe Everything You Think!