Double Sprocket on Reverse Gearbox Problem

[Silentwitness33]

Hey folks,

Hoping someone can offer some insight. I purchased this unfinished go kart and ran into an issue with the reverse gearbox. I'm new to this world so please forgive my terminology.

The external reverse gearbox has a double sprocket (16T) paired with a double sprocket on the axel. I've read that double sprocket reverse gearboxes aren't that uncommon when paired with the GY6 engine and a long output shaft. However, on my setup there is barely enough thread to keep the gearbox on. In fact, the first time I fired up the engine, the nut spun off almost immediately. The only think I can think of is removing the double sprocket and replacing it with a single sprocket to gain myself 3/4 of an inch or so. But I haven't found a supplier who offers a replacement for this gearbox. The second alternative is to buy a new reverse gearbox with a single sprocket but I'm hoping to avoid that.

I've attached some pictures to show my setup. It's a Hammerhead style go kart with a GY6 engine with long output shaft installed. I would appreciate some ideas.

 

[Karttekk]

I would talk to these people, they may be able to help you.

Hammerhead Performance

Hammerhead Performance Home Page, Go Kart Parts

hammerheadperformance.com

 

[Karttekk]

Or these people. Polaris owns Hammerhead.

Product Support - Hammerhead Off-Road

Hammerhead Off-Road® has been distributing off-road vehicles since 2003. Check out our Youth Go Kart & Go-karts for kids, Off-Road Buggy, & Affordable UTV. Product Support

www.hammerheadoffroad.com

Scroll to page 31 https://www.hammerheadoffroad.com/w.../12/GTS-150-Parts-Book-2010-2011-f-r-only.pdf

 

[Karttekk]

Provide a picture of the whole kart, that could help identify what brand & model.

 

[Silentwitness33]

Thanks for the response. I reached out to the Hammerhead Performance website you referred to. Less than helpful. They appear to have a part which looks like it might work but they are refusing to provide me with measurements citing the trouble they get into if they are inaccurate. Here's the link for reference anyway:

Hammerhead Sprocket 16T, Drive Sprocket for Reverse Assembly - 8.010.123 replaces 12.027.004

8.010.123, DRIVE SPROCKET

hammerheadperformance.com

I was hoping they would provide me diameter of the inner flange to see if it will marry up against my reverse gearbox.

I've attached some pictures of the kart.

 

[ezcome-ezgo]

Is it plausible the axle has shifted to the right? Can you adjust the axle position left to right?

 

[Karttekk]

Try these vendors

https://store.maximumparts.com/catalogsearch/result/?q=Reverse+Sprocket

PARTS - PARTS BY SUPPLIER - TRAILMASTER PARTS - Page 1 - txpowersports.com

Discover durable, high-quality TrailMaster parts for UTVs and ATVs. Explore essential upgrades, replacements, and more for reliable performance off-road.

txpowersports.com

TrailMaster 150 Drive Sprocket

Drive Sprocket for TrailMaster go kart 150 XRS / XRX and TrailMaster UTV 150 / 150-X.

www.trailmasterbuggyparts.com

 

[DHeapster]

Good day.
I have ran into this issue as well. The reverse drive is totally messed up. I am trying to find a new replacement but they only seem to have a single sprocket. Where mine is a double sprocket. Where you able to find a replacement one