Which replacement garter spring should I get for a go kart with a Briggs and Stratton 133432 engine?

[carlruthig04]

I have a Red Fox LXT 213cc one-seater go kart with a Briggs and Stratton 133432 engine, and a Comet 30 series torque converter. Recently the garter spring in the driver unit for the torque converter broke, and I‘m wondering which new spring to get, as the original doesn’t have any color that I can see. I tried the fluorescent yellow spring from Comet which engages at 4200 RPMs with aluminum die cast weights, but they were too strong, and my go kart had a pretty hard time moving. Does anyone know the spring that would work best for this engine, or at how many RPMs the engine reaches peak torque? I would like the go kart to have a fairly smooth takeoff, but still be able to start pretty easily on hills. Thanks in advance for your replies.

 

[Denny]

I think the GoKart Supply website has a list in the parts section with for CVT’s with engagement rpm and colors.

 

[carlruthig04]

I think the GoKart Supply website has a list in the parts section with for CVT’s with engagement rpm and colors.

But I don’t know what the the engagement RPMs are for this engine. That’s what I’m asking.

 

[karl]

2200-2300 is what ya need. So you can keep the die cast aluminum weights , and run the orange springs.

 

[Rat]

Stock Comet30 weights LOOK like aluminum, they are in fact zinc.
Just don't go crazy and get the yellow spring for the driven like I did unless you enjoy the smell of burning rubber and the hellish clatter of a belt coming apart slapping everything.

I ended up adding an extra hole looser in the driven hub to make it work without stretching belts till they come apart.
I'll be getting a green spring and adding an extra hole tighter for it... the stock red spring is the softest spring, and I've ate belts with sheave rivets using it

 

[carlruthig04]

2200-2300 is what ya need. So you can keep the die cast aluminum weights , and run the orange springs.

Actually, I just realized that I have zinc weights, not aluminum. So would I need the blue springs instead?

 

[Rat]

Actually, I just realized that I have zinc weights, not aluminum. So would I need the blue springs instead?

Nobody can answer that without engine specifics such as HP peak, and max torque range because the springs depict the range in which the sheave engages the belt. There's a chart somewhere that lists the spring and weight combinations to achieve what RPM engagement speed.

Comet 011190A White Garter Spring - Set of 2

OMB Warehouse - Go Kart Parts and Mini Bike Parts. OEM and Aftermarket supplier of Outdoor Power Equipment Parts, Arborist and Landscape Supplies.

www.ombwarehouse.com

[Disregard "white" and scroll down the page to complete listings]

 

[Rat]

You were suggested Orange springs on the assumption of cast aluminum flyweights giving a 2300rpm engagement, so yes it would seem that blue on zinc is an adequate trade off based on Karl's advice.

The 100 rpm earlier engagement should be negligible to performance. Comparitively pink would be low enough engagement to risk stalling, and white is going to be nearly at the top of the common 3500 rpm peak output for bone stock engines.

As for driven springs: the Red that comes preloaded on most is generally sufficient for 5hp and lower, green seems to be best for 5hp to 10hp, Yellow is best for 10+ which is above the backing plate recommendation. I find the recommendation a bit laughable since the Comet 30 and 40 clones use the same backing plate, and the 40 is intended for 10hp and up.