It doesnt have to be 410, exactly. I reduced the rear wheel size, and I use a
16 tooth bmx freewheel.
10 inch rear scooter tire, and I get 42 mph.
here's my calc.
http://www.thebitstream.com/scoot/
Snake Eater CVT
- Thread starter kerf
- Start date
It doesnt have to be 410, exactly. I reduced the rear wheel size, and I use a
16 tooth bmx freewheel.
10 inch rear scooter tire, and I get 42 mph.
here's my calc.
http://www.thebitstream.com/scoot/
This should explan what is going on with globle warming. Sickning
AWESOME what you are doing. I am going to print all this so when I get ready to use mine I will make all the mods before I put it on..........Thanks.....Curt
YouTube - URGENT UPDATE 21st DEC - DEATH OF THE GULF STREAM - EUROPE TO GO INTO A MINI ICE AGE??
AWESOME what you are doing. I am going to print all this so when I get ready to use mine I will make all the mods before I put it on..........Thanks.....Curt
YouTube - URGENT UPDATE 21st DEC - DEATH OF THE GULF STREAM - EUROPE TO GO INTO A MINI ICE AGE??
kerf
New Member
As long as I'm discussing modifications to the pocket bike CVT, I need to mention one other modification I've made. These tranny's are designed to run in a horizontal position, as the gearbox has a vent plug that should be directed up. In my application, the tranny is mounted in a vertical orientation, placing the vent plug down and that won't work. Our own Neat Times as well as the guys at GoPed Nation solved this issue by replacing the vent plug with a solid bolt and while their solution has worked, I felt it should be vented.
My first go at venting involved sweating a piece of brass tube into the hole in the vent plug and attaching a piece of clear tubing via a rubber elbow. This formed a oil reservoir for the oil to expand into and a way to check on the oil level. While it worked, I could never get the clear tube sealed to the rubber elbow and it leaked. My next try involved sweating a 1/8" pipe x 1/8" hose fitting into the vent plug and using an 1/8" pipe elbow and a 5" x 1/8" pipe nipple to act as the reservoir. This didn't leak but required a dipstick to check the oil level. I soldered a piece of brazing rod into a vented brass cap to make the cap / dipstick.
Filling the gear box needs to be done before mounting, with the tranny in a horizontal position. The fill plug on the low side of the gear box is removed and oil is forced in until it comes out of the reservoir on the high side. Any trapped air will be "whipped" into the oil which is forced into the reservoir when the tranny heats up. The air will separate from the oil and be vented away. After several of these heat / cooling cycles, all the air will be expelled, leaving a gearbox completely oil filled.
This project has taken a lot of work by trial and error but the results, IMO, are worth the effort. I would pretty much put my bike up against a factory moped and I feel I could hold my own.
My first go at venting involved sweating a piece of brass tube into the hole in the vent plug and attaching a piece of clear tubing via a rubber elbow. This formed a oil reservoir for the oil to expand into and a way to check on the oil level. While it worked, I could never get the clear tube sealed to the rubber elbow and it leaked. My next try involved sweating a 1/8" pipe x 1/8" hose fitting into the vent plug and using an 1/8" pipe elbow and a 5" x 1/8" pipe nipple to act as the reservoir. This didn't leak but required a dipstick to check the oil level. I soldered a piece of brazing rod into a vented brass cap to make the cap / dipstick.
Filling the gear box needs to be done before mounting, with the tranny in a horizontal position. The fill plug on the low side of the gear box is removed and oil is forced in until it comes out of the reservoir on the high side. Any trapped air will be "whipped" into the oil which is forced into the reservoir when the tranny heats up. The air will separate from the oil and be vented away. After several of these heat / cooling cycles, all the air will be expelled, leaving a gearbox completely oil filled.
This project has taken a lot of work by trial and error but the results, IMO, are worth the effort. I would pretty much put my bike up against a factory moped and I feel I could hold my own.
Attachments
wayne z
Active Member
Thanks Kerf and others, I learned a LOTof good tips and tecniques following your thread.
You have definatly changed that cvt from a stone to a jewel.
When my Hoot chainbox gives out, I'm gonna try one of those on my HS.
Just have to mount engine with pullstart on left side and move pedal chaining to that side too.
You have definatly changed that cvt from a stone to a jewel.
When my Hoot chainbox gives out, I'm gonna try one of those on my HS.
Just have to mount engine with pullstart on left side and move pedal chaining to that side too.
NEAT TIMES
New Member
Wayne z
my original plan was to also move pedal chain to left side. Then i came up with the double freewheel on the right side. It has worked out very well. Much easier. Thinking it is `cvt rack mount` thread.
Good luck, ron .
my original plan was to also move pedal chain to left side. Then i came up with the double freewheel on the right side. It has worked out very well. Much easier. Thinking it is `cvt rack mount` thread.
Good luck, ron .
kerf
New Member
The link to Neat Times thread is located in post #1 of this thread. His solution, putting both drives on the right side, was a stroke of genius. If I hadn't already had an expensive Staton wheel, I would have used his setup.
wayne z
Active Member
Ok, i found the post. What is a Bb kit? Who sells them?
This should be esaier to do on my bike,using a single speed pedal chaining.
Thanks, Wayne
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NEAT TIMES
New Member
Wayne
bb is for bottom bracket = where the pedals are mounted. All the info should be in the thread. The part # , price and seller. The bb kit is a set of bearings and the threaded cups. The cup with the right hand external threads is used to join the freewheel bearings together.
If you study the post`s in the thread you should be able to understand. The rear derailer is just used as a chain tensenior as you only have one rear sprocket for the pedal chain. When you purchase the rear pedal sprocket get a 3/16" wide teeth sprocket or go to a bmx chain for the 1/8" wide teeth sprocket.
Also, if you mount the large motor driven sprocket on the inside of freewheel flange (spoke side) you should be able to omit the spacer between the free wheel bearings. The free wheel hub`s are hardened steel and tuff.
Ron .
bb is for bottom bracket = where the pedals are mounted. All the info should be in the thread. The part # , price and seller. The bb kit is a set of bearings and the threaded cups. The cup with the right hand external threads is used to join the freewheel bearings together.
If you study the post`s in the thread you should be able to understand. The rear derailer is just used as a chain tensenior as you only have one rear sprocket for the pedal chain. When you purchase the rear pedal sprocket get a 3/16" wide teeth sprocket or go to a bmx chain for the 1/8" wide teeth sprocket.
Also, if you mount the large motor driven sprocket on the inside of freewheel flange (spoke side) you should be able to omit the spacer between the free wheel bearings. The free wheel hub`s are hardened steel and tuff.
Ron .
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kerf
New Member
Where did you see "Bb kit", are you referring to a "Big Bore Kit"?
kerf
New Member
I've managed a few test rides since completing my modifications and I've been itching for a twenty miler. The weather has been bad, with all the ice but it's gotten above freezing a couple of days and it's been melting. I am all fueled and charged up for a 5AM run to the Norfolk Southern train yard at Irondale, NWS said the low would be 33, sounded like a go. Got up and my thermometer read 30 degrees, lots of water out there from melting ice, I chickened out. Figured if I hit one patch of black ice, my day will go down hill quick.
Don't know if I've become smarter with age or just a coward.
PS
Some pictures from last weeks ice storm.
http://motorbicycling.com/f28/welcome-deep-south-26514.html
Don't know if I've become smarter with age or just a coward.
PS
Some pictures from last weeks ice storm.
http://motorbicycling.com/f28/welcome-deep-south-26514.html
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kerf
New Member
It's been three weeks since my last ride and subsequent modifications. The weather has been pretty uncooperative but today things were better. At 5:00 AM the temp was a balmy 48 degrees and it was dry, sure beets the 28-30 degrees last time. Even with the warmer temps, I still managed to screw up and go under dressed, wearing a sweat shirt instead of my coat. About froze my bum off!
I may have been uncomfortable but the bike was at the top of its game. A good hard 20 mile run, with plenty of hills and she worked just like any factory moped. Other than running over a center divider while making a left hand turn, the ride was uneventful with never a pedal turned. My modifications seem to be a success. One thing I have noticed about the CVT is my mileage has gone way down. I guess the drag in the belt drive may be responsible but it is a small trade off for a fully automatic transmission.
Kerf happy!!!!
I may have been uncomfortable but the bike was at the top of its game. A good hard 20 mile run, with plenty of hills and she worked just like any factory moped. Other than running over a center divider while making a left hand turn, the ride was uneventful with never a pedal turned. My modifications seem to be a success. One thing I have noticed about the CVT is my mileage has gone way down. I guess the drag in the belt drive may be responsible but it is a small trade off for a fully automatic transmission.
Kerf happy!!!!
kerf
New Member
I just got back from a 20 mile run to the train yard, saw a west bound intermodal and another freight leaving Norris Yard. It was 59 deg. when I left, still in thermals, jacket and gloves but comfortable.
The CVT, even with the issues, I'm afraid has ruined me forever. The bike handles just like a factory moped, pulls off from a start, even up hill w/o pedaling. I cruise at 30 with no strain, when you hit a hill, the bike slows down to about 20 but the engine doesn't bog and there's no shifting. Think I'm going to pull the belt cover today, just to check things out and make every thing is like I left them.
You mean its working like it supose to? Keep us posted I have two and will redo them before I use them. I was very disapointed when I took mine apart and seen the shafts and clutch drum wable. But will redrill and put the new threads on.
I know the Comet ones work great and are used on Jr.dragsters and all and don't see why they can't be made to work the same.
Its just a shame that one has to go through all that work.........Curt
I know the Comet ones work great and are used on Jr.dragsters and all and don't see why they can't be made to work the same.
Its just a shame that one has to go through all that work.........Curt
kerf
New Member
Since my CVT overhaul, the first week of January, I guess I've only ridden about 120 - 140 miles with the weather as it has been. After my 20 mile ride this morning, I did a little exploratory surgery to see how everything was holding up. I pulled the belt cover and removed the nut and washers from the variator shaft, here's what I found:
Outer variator sheave was still tight on the shaft with no signs of shaft wallowing.
There was very little if any belt dust in the cover, belt looked good.
There were no signs of gear oil leakage anywhere.
The engine was 4 stroking in the low to midrange, plug was black so I'm going to lean out the low speed circuit.
I took two coils off the spring on my chain tensioner to tighten the drive chain a little.
That's about it, no drama, no fuss, no mess.
Outer variator sheave was still tight on the shaft with no signs of shaft wallowing.
There was very little if any belt dust in the cover, belt looked good.
There were no signs of gear oil leakage anywhere.
The engine was 4 stroking in the low to midrange, plug was black so I'm going to lean out the low speed circuit.
I took two coils off the spring on my chain tensioner to tighten the drive chain a little.
That's about it, no drama, no fuss, no mess.
kerf
New Member
Just thought I would update the CVT project. After I destroyed and patched up my first tranny, I decided it was time to go again and do it right this time. The areas of concern with the original CVT were the clutch shaft bearings, the variator back plate stop, the outer variator plate reinforcement and the gear box seals.
I bought a new tranny and began to replace and rework parts before going into service this time. After the mods, we're back on the road again and things are much better. With the new tranny the gas mileage has increased, a 30 mph cruise speed is almost too easy (6750 rpm out of an 11,000 red line) and the pull off from a dead start is as good as any moped on the market. I got to quit riding this thing with the engine running because I don't pedal anymore and I'm getting out of shape bad.
Signed,
Happy But Fat
I bought a new tranny and began to replace and rework parts before going into service this time. After the mods, we're back on the road again and things are much better. With the new tranny the gas mileage has increased, a 30 mph cruise speed is almost too easy (6750 rpm out of an 11,000 red line) and the pull off from a dead start is as good as any moped on the market. I got to quit riding this thing with the engine running because I don't pedal anymore and I'm getting out of shape bad.
Signed,
Happy But Fat