Firmstrong 4 Stroke Predator 79cc Monster 80 Motorized Bike Bicycle 

I got mine up to 40 mph with no governor , 18ft/lbs valve springs and a comet tav2 cvt

Bradley Chardenet Is the comet the one I see on the 212s? Doesn’t that rob a ton of power?

@@bradleychardenet9453 How fast with the governor on? How about hill climbing?

@@zoologicalmilitia2241 I got rid of it because I kept getting issues with it. I was tired of dumping money into it. But mostly downhill. I now have a mini bike that I built a 20hp Honda gx200 on it

​@@st.paulmn9159 if you replace the default 2000rpm red spring that comes with the cvt with a 1000rpm green spring it doesnt rob much power

Yeah, the front has caliper/side pull brakes, but the back has a double reinforced Nexxus coaster brake. Nothing beats hydraulic disk brakes though!!! Lol

@@SouthernCustomCC I'm assembling one of those new aluminum built-in gas tank frames just got myself some $50 hydraulic brakes for the bike unfortunately with these brakes the brake lines are a little bit short for that frame so be aware of that if you should buy . But it's very easy to change these lines and also inexpensive RU-vid as a couple of videos highly recommended. Good luck with future builds and enjoy yourself.

If you do a 212cc swap you will need wider cranks but if you keep it with this engine its normal bicycle pedals

Yep u need the torque converter

Thanks for watching. This was a gasbike.net engine kit. Best of luck!

That was a stock 2-stroke exhaust about $12.00, but what's wrong with a stock predator exhaust. Did you get your boat going?

You probably need to buy a new chain and cut it, either 415-420-440 or 40 D for the big chains you need buy a chain breaker from Harbor Freight you can cut big chains but the push pin is too big for the 415 stock need the Walmart breaker.

senorboardhead : The Nexus shifter is used just as it would normally be used when biking. It has no effect on the motor or speed of the bike. Yet, because the hub is larger @ 1.85”, you will need to set up your spricket accordingly to that size. Thanks for watching.

Southern Custom CC OK, so the three speed Nexus is only used when pedaling the bike ? The hub just freewheels when the motor is driving ?

senorboardhead: Yes, sir. If you want to use the normal gears a bike has with the motor to have actual ’gears’, then you would install a jack shaft. Without one, the gears are just normal bile gears when pedaling. Enjoy!

Southern Custom CC Hey thanks ! Makes perfect sense. Smart of you to start with a bike that you could probably pedal a ways if you had to - even with a dead engine on board. Thanks again.

Thanks for watching. It came with the predator kit on gasbike.net back in the day. I am sure they still sell just the mount. Best of luck

Yes

If you build yourself, your looking at about $250-$315 for motor set up, then $200 for bike, $35 for adaptor. The CNC adapter is a very user friendly, safe setup that easily installed with m10 allan bolts. Worth the money and the adapter assures an accurate, aligned sprocket. Just bypass the governor when setting up to get most power from the engine. Happy building and thanks for watching!

Damn, just heard you say 1.85. I already ordered a 1.5, not knowing.

Sorry, man. Your going to love this ride though! Happy building.

@@SouthernCustomCC cool thanks! I ordered a new one... listed as 1.8, I figured that’s the one? Ha I hope so. I figure I’ll use the other one eventually, I want to get into this. Also, in doing so, I went from having just a 44 tooth, to also having a 36 now. I’ve heard about the pros and cons of both. I’d like to maybe do some long distance rides, so less teeth the better.

@@SouthernCustomCC Thanks again man. This bike just looks awesome and durable. Has a cool look with the whitewall tires, and the classic beach cruiser look. Seems like there are several options of directions to go with this one.

Christian Campbell: yes, I had to install the 3 piece wide pedal crank.

I didn't max it yet. I was still breaking it in, but hit 30 and there was still a lot more the engine could have given.

@@SouthernCustomCC so you didnt remove governor and got 30

person : No, the governor has been bypassed. You can do it yourself on the cheap; otherwise gasbike.net sells the bypass kit for like $8. That will allow you the full potential of the engine.

@@SouthernCustomCC if i remove the governor, would it make the engine less reliable. I am not planning to use it for racing. i plan on using it for transportation. would i be better off getting the 49cc 4 stroke rather than a governed 79cc

Alex Ayala : Removing the governor will not effect it's reliability in my experience. All it does is remove a restriction on engine potential. Gas bike.net sells a governor removal kit if you don't want to make a set up yourself. It's up to you... There is definitely power differences...i personally like the 79cc but they are not accepted as much legally as the 49cc in most places. Either way, be safe and have fun!

You can get them at gasbike.com

This is a Firmstrong. Good bikes to build on are Firmstrong and Micargi. Hope this info helps! Happy building.

@@SouthernCustomCC also i put mine together and gas is pouring out of the carb any tips how to fix this issue?

death the kid : The easiest way to avoid this is to use a CNC rear sprocket adapter and push it close to all the way out so that the inner ring of the CNC in near flush to the inside of the hub wall. The second easiest is to set up the rubber gromets so that the fatter/wider rubber gromet is used in between the sprocket and spokes while the thinner rubber gromet is used on the inside of the job and set up. The next option you have is to order a smaller width rear tire and replace the one your have, but that would be close to as much money as the CNC sprocket. What ever you do... Don't buy and use a thinner chain...theu are weak and snap much more easily. Hope this helps! Thanks for watching.