780 Torque Converter Shifting Issues

[In0v8er]

Hello, I'm having a problem with my 780 Torque Converter. The secondary pulley shifts too early at low speed, opening all the way, causing the belt to slip and create a lot of heat. I put an extra twist in the spring preload to put more force on the pulley, but it still slips. Usually when I first start it up in the morning when it is cooler it pulls great and shifts great. I ride it for 15 min and it doesn't pull at all. I'm running a stage 4 kit on a Honda clone 440cc engine with 28 hp. My gear ratio is roughly 7:1 on a 450lb off-road cart for a little more speed. Would I need to invest in another type of torque converter or get a custom spring in the secondary pulley? I was sure that the 780 would be strong enough.!!!

 

[Denny]

Is there a heavier spring available? Are you using a high quality belt like a Genuine Comet? Might want to start there. Heat buildup is kinda normal. There is some slippage, you can’t stop it all.

 

[madprofessor]

I can only envision a cheap belt, either worn narrower, or its sides just unable to grip the smooth steel sides of that pulley once warm.
Comet. or maybe a Comet. or you could try a Comet. No tails on a Comet. Get a Comet.

 

[In0v8er]

I'm pretty sure it is a genuine Comet from gopowersports.com, (780 Tav kit with backplate). Anyway so I found the problem and the pre load on the spring was still not strong enough. I twisted it an extra turn, pressed it back in, now it pulls harder than its ever pulled. I'll say this, it keeps up with my honda 400ex sport quad even up to the middle of 4th gear lol. I'm gonna try to get a top speed but I don't wont to blow the engine.