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4 Stroke Bicycle Engines & Kits 4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine

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  #11  
Old 12-04-2016, 09:39 AM
curtisfox curtisfox is offline
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Default Re: 79cc vs 212cc Predator

This is really looking good, got to watch it closer. .............Curt
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  #12  
Old 12-10-2016, 07:01 AM
ajoh ajoh is offline
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Default Re: 79cc vs 212cc Predator

ultralight find threads by guys like "scotto" who've built 212's an get tips an tricks from their builds eg, from memory this is the rear hub scotto uses (only from another dealer)
http://www.bikeberry.com/engine-kit-...-axle-kit.html

then he uses a jackshaft disc brake, he cuts the disc down to detune it so it's not so sensitive

pretty sure he swears by frames built by felt too, for there strength ? (honestly can't remember whether i correct with that or not as it's been a while lol)

just be safe an have fun..........oh an good luck...........
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  #13  
Old 12-10-2016, 05:26 PM
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MotoMagz MotoMagz is offline
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Default Re: 79cc vs 212cc Predator

Yes it is big but like mentioned above you can shrink it a little. I did do a lot of stuff internally and externally on my motor so I can not comment on a stock motor. If you remove govoner you want a billet fly wheel For sure. I chose a ultalite with 6 degree advance timing built right in. Nexts 18 lb springs and then a long intake with a Real Mikuni Vm22 carb.Which let me to a header pipe with. Rlv free flow muffler. It's drive is a cut to a WHIZZER rear sheave all belt drive. It is unbelievable how much torque it has. If you can do it go with the 212cc if not start of with a kit like 7g. 212 is not a bolt and go it's more of a project with some small welds in most cases...good luck
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  #14  
Old 12-13-2016, 12:10 AM
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ultralight01 ultralight01 is offline
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Default Re: 79cc vs 212cc Predator

Motomags, if you do not have a billet Conrod, prepare to lose your balls (Not really, it's mounted vertically. Haha)
I had a lightly modified clone that exploded with a billet flywheel but a stock Conrod.
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  #15  
Old 12-13-2016, 01:39 AM
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Tony01 Tony01 is offline
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Default Re: 79cc vs 212cc Predator

You don't need billet parts unless you plan on turning high rpms. Stock 212 gov removed predator single speed runs good with a gear ratio of 6.5 to 8.2. I'm running a 7:1 right now and my buddy runs an 8:1. His revs out more but our top speeds are still about the same at 55ish. Gear it for the rpms so you don't overrev it.
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  #16  
Old 12-14-2016, 10:17 AM
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MotoMagz MotoMagz is offline
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Default Re: 79cc vs 212cc Predator

Ya I'm cool with the cvt I don't push high revs....cuz
I like my balls
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  #17  
Old 12-25-2016, 08:34 PM
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donphantasmo donphantasmo is offline
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Default Re: 79cc vs 212cc Predator

My buddy has a mini bike and we just went from a 79cc to the 212... I'll tell you there is a HUUUGGGEEEE difference.

I can't believe I'm about to say this, but the 79cc was plenty. The 212 is too much for a bicycle. Don't forget that the bike's bearings and brakes were meant for pedaling. So, if you upgrade it to a 79cc, you're pushing it's limits. If you go with the 212, you better make sure it's a damn good bike, and it can handle the power.

Let's just put it this way... I have (and sold many) classic Vespas. these things are 90cc, 125cc and 150cc. The newest one (the PX150) has about 7-8 HP and goes about 55-57MPH. A Vespa weighs a lot more than a bicycle with a motor. And it doesn't have the HP the predator 212 has... So, be careful, or you'll break most speed limits, and most bones..

Like I said, honestly the 79cc was PLENTY of power for me.

Best of luck either way.
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  #18  
Old 01-14-2017, 03:25 PM
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ultralight01 ultralight01 is offline
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Default Re: 79cc vs 212cc Predator

If you guys have been keeping up with my other thread, I bought a 79cc and now I'm modifying it. Governor is gone, new exhaust and 3D printed air intake adapter. I, saving my 212 for a diy surf winch. Why buy one for $2000 when I could build one for a few hundred bucks and some work/welding?
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  #19  
Old 01-16-2017, 01:24 AM
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Scott.D.Lang Scott.D.Lang is offline
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Default Re: 79cc vs 212cc Predator

Not that my 2 cents matter but since you have 212 stuff Id go with the 212 but from someone that has built a few 79ccs they have enough power to go 50 plus stock with governor removal. and easly quicker then any 2 stroke build not as fast top end but quicker.
I am starting on a 212 build now but the only reason Im running a 212 is because I wanted to use a 3d clutch.
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  #20  
Old 01-16-2017, 03:01 AM
TheNecromancer13 TheNecromancer13 is offline
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Default Re: 79cc vs 212cc Predator

Quote:
Originally Posted by Scott.D.Lang View Post
Not that my 2 cents matter but since you have 212 stuff Id go with the 212 but from someone that has built a few 79ccs they have enough power to go 50 plus stock with governor removal. and easly quicker then any 2 stroke build not as fast top end but quicker.
I am starting on a 212 build now but the only reason Im running a 212 is because I wanted to use a 3d clutch.
If you geared a 79 to go 50 mph it would have crap acceleration power.
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