Predator 79cc

[Choochoo_nesby]

I'm about to start building another bike, is there anything I'll need for the 79cc engine? I have the mount and transmission, I've watched a couple of videos and read the posts here. I think I'm going to leave the engine as is, no governor remover or carb upgrade. Do I really need an adapter for the exhaust, that will be the one thing that will most likely change.

 

[5-7HEAVEN]

Idk about the exhaust.

Just be sure that you have the correct gear ratio.

 

[MotoMagz]

Exhaust with Muffler for: Predator 3HP 79cc from Harbor Freight Tool, Mini Bike. | eBay

This muffler is a little more Loud than the factory. -This exhaust will change color due to the high heat generated by the engine. Type of material: mild steel, Uncoated Steel. Exhaust with Muffler!

www.ebay.com

 

[Choochoo_nesby]

Idk about the exhaust.

Just be sure that you have the correct gear ratio.

I've been looking at that, not sure where mine will be, using https://affordablegokarts.com/pages/gear-ratio-calculator It is saying 8.889, which seems low.

 

[curtisfox]

Somewhere on this forum is a ratio chart in the sticky's that includes tire diameter, that is close but is designed for Go-karts..........Curt

 

[MotoMagz]

Here is a Jack shaft calculator https://electricscooterparts.com/motor-jackshaft-wheel-gear-ratio.html

 

[curtisfox]

Here is a Jack shaft calculator https://electricscooterparts.com/motor-jackshaft-wheel-gear-ratio.html

Thanks Moto, I was looking, but no find, I don't think his ratio is far off ...........Curt

 

[MotoMagz]

Thanks Moto, I was looking, but no find, I don't think his ratio is far off ...........Curt

You bet budddy!

 

[Choochoo_nesby]

Here is a Jack shaft calculator https://electricscooterparts.com/motor-jackshaft-wheel-gear-ratio.html

Thanks for that, I remember seeing that or a similar one before. As long as it can get up to 30, i should be fine with it. i imagine this engine will run smoother than the 49cc I currently use. This will also most likely go on my Seattle SS I have, just need to make sure I can get the sprocket on the rear wheel properly.