Go Back   DIY Go Kart Forum > Building Plans And Advice > Engines & Clutches

Notices

Reply
 
Thread Tools Display Modes
  #1  
Old 03-30-2020, 12:06 PM
sagegervais sagegervais is offline
Junior Member
 
Join Date: Mar 2020
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default Newbie - Torque Converter Question

Hello everyone,

I recently purchased a Yerf Dog GoKart for my son and I, with a Predator 212cc engine. While we were out yesterday, the belt snapped (in half - didnít shred). It appeared to be pretty old, however, after looking at the TC, the pulleys donít line up. Is this from an improper install? Or is it possibly the wrong TC? It drives ok but it definitely feels like the TC doesnít always want to release when stopping. Also - is there a simple way to make the brakes better? I adjusted the cables and that helped but Iím thinking theyíre just old and tired? Any advice would be greatly appreciated.

Thank you
Attached Thumbnails
0D277F39-1D94-403B-9FBC-9B1E9FB64550.jpeg   76887DD7-A926-455D-B563-B4A2AE50DD83.jpeg  

FE4A7FFD-146C-40D6-9CDC-E92E8053B28B.jpeg  
Reply With Quote
  #2  
Old 03-30-2020, 01:08 PM
J.S.@SMS's Avatar
J.S.@SMS J.S.@SMS is offline
Road Hazard
 
Join Date: Sep 2018
Location: Weeki Wachee Fl.
Posts: 867
Thanks: 72
Thanked 150 Times in 134 Posts
Default

Oh yeah, that's got to be the worst alignment I've ever seen. You'll probably have to cut down the spacer behind the driven pulley (the one on the jackshaft). Could you get a pic looking at the pulley and jackshaft from behind the engine (looking forward) so we can see how much the pulley can be moved over?

And could you get a pic of the brakes? You might be able to clean up the pads/band with some sandpaper, I use 80 grit and it works pretty well. That should help with the brakes a bit, but if the cables are worn out they'll stretch, and you won't get as much braking power as you should. And at that point they'll have to be replaced. But it would help to know if it has disk or band brakes.
__________________
For his personal safety, keep this one away from bicycles.
Reply With Quote
  #3  
Old 03-30-2020, 01:23 PM
sagegervais sagegervais is offline
Junior Member
 
Join Date: Mar 2020
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Thank you for the quick reply. It is definitely band brakes. I was thinking about converting to disc, but I will try out the sandpaper first.

The pulley area definitely looks tight
Attached Thumbnails
902936D5-4AA0-4E46-9C56-C21548D1CFFE.jpeg   C971FE04-436A-404A-B5C8-A4BD3FA101F1.jpeg  

E8B4759F-5C38-401F-96DF-7EDA399A0A93.jpeg  
Reply With Quote
  #4  
Old 03-30-2020, 06:03 PM
sagegervais sagegervais is offline
Junior Member
 
Join Date: Mar 2020
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I think I may have found the fix. The bolt for the driver pulley is only 1.5” long rather than 2”. I think if I add a spacer and install a 2” bolt it should be good... if I’m missing something, please let me know.
Reply With Quote
  #5  
Old 03-30-2020, 06:22 PM
Brianator's Avatar
Brianator Brianator is offline
Gettin' er done!
 
Join Date: Feb 2020
Location: Barrie, Ontario, Canada
Posts: 471
Thanks: 98
Thanked 114 Times in 102 Posts
Default

Sounds like you're on the right track! You want the flat sides (closest to the motor) as lined up with each other as possible. It wouldn't hurt to clean the rust off the pulley inner faces and smooth them out best you can, it aids in belt grip and helps prevent premature belt wear. If I'm remembering correctly I think I used a 2-1/4" long 5/16 x 24tpi plus a washer for my driver as I wanted as much thread engagement as I could get. Dont forget the (blue) threadlocker!
__________________
"Black is the fastest color"
Reply With Quote
  #6  
Old 03-31-2020, 01:07 PM
Jhoppe Jhoppe is offline
Member
 
Join Date: Mar 2019
Location: Indiana (IN)
Posts: 92
Thanks: 13
Thanked 9 Times in 9 Posts
Default

Another thing I have seen on here is taking the drive sprocket from behind the driven pulley to the outside. I am going to try it on my yard, but I haven't had the time. Kartfab has a picture of it. But you pull off the driven and sprocket, then reinstall the driven with the sprocket on the outside and that helps with alignment
Reply With Quote
  #7  
Old 03-31-2020, 05:49 PM
sagegervais sagegervais is offline
Junior Member
 
Join Date: Mar 2020
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I thought about doing that actually. My only concern would be the exposure of the chain. With my little one driving it, I wouldnít feel too safe with the chain being on the outside. If it was just me, I would just send it haha.
Reply With Quote
  #8  
Old 03-31-2020, 06:52 PM
Brianator's Avatar
Brianator Brianator is offline
Gettin' er done!
 
Join Date: Feb 2020
Location: Barrie, Ontario, Canada
Posts: 471
Thanks: 98
Thanked 114 Times in 102 Posts
Default

What I did to space my driver clutch outward on my Champion 6.5hp (which is a Honda GX200 clone) to match the driven is I first installed a 3/4" shaft collar. It didn't QUITE get it perfect so I added a very thin shim washer I got at home depot (see picture). It only left about a 1/4" of shaft for the hub to go on after the inner pulley was on but according to everything I read that's fairly normal and I haven't had an issue as of yet. I did make a spacer from the end of another crankshaft which I learned wasn't required but it does help I'm sure. Make sure your bolt is long enough, use blue threadlocker and you should be good! Another option you MAY have is to move the motor over to get better alignment. Keep at it, many others have faced and overcome the same issue
Attached Thumbnails
20200113_135641.jpg  
__________________
"Black is the fastest color"
Reply With Quote
  #9  
Old 03-31-2020, 08:06 PM
Jhoppe Jhoppe is offline
Member
 
Join Date: Mar 2019
Location: Indiana (IN)
Posts: 92
Thanks: 13
Thanked 9 Times in 9 Posts
Default

This is what I was taking about. (Credit to Kartfab, it is his kart and picture) adding a piece of angle iron as a chain guard wouldn't be very hard to protect little one. Mine is way behind the seats so it isn't an issue.
Attached Images
 
Reply With Quote
  #10  
Old 03-31-2020, 08:17 PM
sagegervais sagegervais is offline
Junior Member
 
Join Date: Mar 2020
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Thatís interesting. Did he flip the sprocket on the axle?
Reply With Quote
  #11  
Old 04-01-2020, 05:53 AM
Jhoppe Jhoppe is offline
Member
 
Join Date: Mar 2019
Location: Indiana (IN)
Posts: 92
Thanks: 13
Thanked 9 Times in 9 Posts
Default

I believe the sprocket will slide that far if you loosen it. You MIGHT have to extend the key way a bit, but I dont think so. I dont remember.
Reply With Quote
  #12  
Old 04-02-2020, 07:48 PM
sagegervais sagegervais is offline
Junior Member
 
Join Date: Mar 2020
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Well if anyone was interested.... I was trying to copy that sprocket setup. The sprocket is completely seized. I’ve torched it, used lube, you name it. So I’m just buying a new axle lol.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 05:11 AM.