Torque converter

Mini Bike & Go-Kart Parts

#1
IMG_20201125_124657069.jpg IMG_20201121_123727162_HDR.jpg IMG_20201125_124657069.jpg IMG_20201121_123727162_HDR.jpg I have an MTD Columbia I am restoring. It has a fairbanks morse driven pulley. In the box of parts that were with the bike I have a driver pulley. It does not look like the fairbanks morse driven I have seen in other photos, no name numbers or any other identification. Does anyone know the brand and if it will work with the original driven? Thank you
 

cfh

Well-Known Member
#5
series20 drivens pull inward. series30 drivens pull outward. on that MTD it's a series20. it also is probably a 5/8" wide belt. all the new drive units will be set up for a 3/4" belt. you have some thinking and/or work to do here to make it all jive together... Most of the TC drive units off say ebay are series30. that won't work with the original series20 driven on that MTD. also all torque converters sold today (drive and driven) will be 3/4 belt. and that won't work with your (probably) 5/8" belt driven. But the good news is you can convert that new drive unit to a series20 with about $25 in parts. and you can convert it to 5/8" belt too. it's some work but you can do it.
 
Last edited:
#6
series20 drivens pull inward. series30 drivens pull outward. on that MTD it's a series20. it also is probably a 5/8" wide belt. all the new drive units will be set up for a 3/4" belt. you have some thinking and/or work to do here to make it all jive together...
Can you tell in my picture what one that is? The is no markings at all
 
#12
What would you suggest I do?
You need to have a matching driver and driven. I am not sure which is the better series to run on a MTD... either get a 30 series driven to match your driver or get 20 series complete set up. You need to search it out a little further to see what other people have done. I am unsure which series.
 

mustangfrank

Well-Known Member
#15
View attachment 271669 View attachment 271670 View attachment 271669 View attachment 271670 I have an MTD Columbia I am restoring. It has a fairbanks morse driven pulley. In the box of parts that were with the bike I have a driver pulley. It does not look like the fairbanks morse driven I have seen in other photos, no name numbers or any other identification. Does anyone know the brand and if it will work with the original driven? Thank you
Back it up a second, let's hear about that serious piece of smoking machinery in the background...hobby or business?
 

cfh

Well-Known Member
#17
another thing you could do is buy a series20 inside sheave and it would basically convert that series30 drive to a series20.
https://www.OldMiniBikes.com/20-series-stationary-sheave-3-4-bore.html
as for the belt difference 3/4 versus 5/8, you can do some lathe work to the drive to make it 5/8". or some spacing to the driven to make it 3/4". or you can just buy the right stuff. that would probably be the easy thing to do...
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=361207391979
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=331761235325
 
#20
another thing you could do is buy a series20 inside sheave and it would basically convert that series30 drive to a series20.
https://www.OldMiniBikes.com/20-series-stationary-sheave-3-4-bore.html
as for the belt difference 3/4 versus 5/8, you can do some lathe work to the drive to make it 5/8". or some spacing to the driven to make it 3/4". or you can just buy the right stuff. that would probably be the easy thing to do...
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=361207391979
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=331761235325
another thing you could do is buy a series20 inside sheave and it would basically convert that series30 drive to a series20.
https://www.OldMiniBikes.com/20-series-stationary-sheave-3-4-bore.html
as for the belt difference 3/4 versus 5/8, you can do some lathe work to the drive to make it 5/8". or some spacing to the driven to make it 3/4". or you can just buy the right stuff. that would probably be the easy thing to do...
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=361207391979
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=331761235325
So is it as simple as replacing the driven pulley?
 

Top