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High Performance Bicycle Engine Tips and Motorized Race Bicycles We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. Also check out some of our racing members builds

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  #1  
Old 11-28-2015, 03:45 PM
Amarion1 Amarion1 is offline
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Join Date: Sep 2012
Location: Bellingham WA
Posts: 83
Default 212 predator build

So it was a toss up between the 79 and the 212 and I figured they're so close in physical size that I'd go with more power. Don't need to use it but its there if its needed. I want my bike to do 50MPH without hesitation and have good acceleration off the line but I don't plan on taking it over 40 =-)

This is going to be a slow build and I'm hoping to get it done for the summer and my funding is coming from donating plasma which is $200 a month

I have a frame but its a tad bit small and I can't afford a new frame so I will lengthen it where I need it to fit this engine with a little room to remove the valve cover (good idea came from scotto's build)

I bought the engine and removed the governor and oil sensor. Need to order a billet flywheel and piston connecting rod

Is it reccomended to upgrade the cam and springs as well? Any advice is greatly appreciated

Still need:

Front suspension fork
Front hydrolic moped disc brake set up
Either rear vbrakes or disc on a jackshaft or both?! ��
Transmission system of some sort
Jackshaft
11 guage spokes
HD rear hub
Front disc hub
Wide pedal crank set up
Engine mounting set up
Throttle set up
22mm mikuni carb and filter
Fuel tank
Tach/hour meter

First i'm building the engine and working the frame to fit it. Then I will work on the wheels followed by a new fork and hook up the brakes. Last will be the transmission system / jackshaft. I'm ordering parts mostly in that order. And maybe the small extras when I get extra money

I'm all about safe stopping and a strong frame!

So I'm super stupid when it comes to numbers and gearing and all that good stuff. I just don't get it... I try but it doesn't click ��

So my biggest problem (besides engine internals) is a transmission set up. I can build my mounting plate to the motor and a jackshaft but I don't understand the gearing for what I want to do. Like a drive sprocket to centrifugal clutch to sprocket to jackshaft sprocket to rear sprocket....

Or I could buy the gasbike trans that they sell for this engine and adapt that to my jackshaft to the rear sprocket but I still don't know the right size gears to use on my jackshaft and rear wheel sprocket

I wanted a qmatic tranny but not 100% sure it will fit the 3/4" drive shaft. And then again there's the jackshaft to rear gearing I need help with

I like the small size of the qmatic to keep the entire set up thinner than wider

Again. I'm looking for good acceleration with little or no pedaling and a top speed of 50 so I can cruise nice at 35-40

I need help! Please and thank you! I will post pics along the way as I go but its gonna be a long ride before the first ride!

I love critisism and feedback and ideas of all kind!

Thanks all!
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Last edited by Amarion1; 11-28-2015 at 03:57 PM. Reason: Typo
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  #2  
Old 11-28-2015, 03:53 PM
Amarion1 Amarion1 is offline
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Join Date: Sep 2012
Location: Bellingham WA
Posts: 83
Default Re: 212 predator build

Oh!

What kind of HP will this engine put out with these mods?

No governor
Billet flywheel
Billet piston connecting rod
Cam and 18# springs (or are heavier springs better?)
22mm mikuni carb
Open but longish exhaust

Thank you =-)
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  #3  
Old 11-28-2015, 06:59 PM
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MotoMagz MotoMagz is offline
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Join Date: Aug 2010
Location: Michigan
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Default Re: 212 predator build

10 -13hp is what I've read. I just did flywheel timing ,carb. and govner . Not doing anything internal besides govner. I think I would rather have the valves float than break a rod. But lots of people replace spring and not rod with good results . There are guys on here with way more knowledge on the 212 then me just throwing on my 2 cents.....good luck
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  #4  
Old 12-01-2015, 01:21 PM
Amarion1 Amarion1 is offline
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Join Date: Sep 2012
Location: Bellingham WA
Posts: 83
Default Re: 212 predator build

Thanks for the info!

Still researching and planning! Ordered a Huffy Millennial 29er last night. Checked it out in store and the steel is the same gauge as my current bike that would have needed chopped forward and taller. Will most likely put a few extra welds on it and I've got a solid steel rod that's going inside the seat tube for added strength

I don't know whether to run the 29er wheels or go with 26's. Any recommendations? Either way I need to spoke it heavier and change axles. I loved my last 29er build and my 700c was wonderful but 26's have better tire selection.. otherwise I will wait and build my jackshaft and see how each size wheel/tire fit with it.
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Old 12-12-2015, 01:12 AM
Amarion1 Amarion1 is offline
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Default Re: 212 predator build

A couple updates although nothing exciting

Received Huffy Millennial 29er bike! Comes stock with 10 gauge spokes too! Don't know if I can use them with the Grubee HD hub I just ordered but I'll find out here soonish! Also received 2 pillow block bearings for the jackshaft. Aaannnndddd I just ordered a keyed shaft, throttle handle/cable, 24 tooth sprocket and adaptor for JS, and another adapter for JS disc brake. Also received the motor mounting plate kit but the brackets wouldn't adjust for the angle I'm mounting at so I ground them to work but its a bit choppy so instead I'm going to buy a couple exhaust clamps to weld to the plate at the proper angle. Slow going but she'll get there
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  #6  
Old 12-13-2015, 02:02 PM
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MotoMagz MotoMagz is offline
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Location: Michigan
Posts: 1,221
Default Re: 212 predator build

Sounds like some good xmas shopping! 10 gauge spokes are 3.05mm ...11 gauge 2.9 mm...12 gauge 2.6 mm most likely they are 12g. That's the largest found on off the shelf bikes. But please measure the diameter of the spokes cuz if there 10g I'm getting some!!!
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Old 12-13-2015, 03:17 PM
Amarion1 Amarion1 is offline
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Default Re: 212 predator build

Awe what a slap in the face 😓. I measured .102 inches and checked the gauge chart at work and got 10 gauge.. These things just look so massive! All my other bikes spokes measure around .080 inches and look like toothpicks compared to these on my new bike



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Last edited by Amarion1; 12-13-2015 at 03:27 PM.
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  #8  
Old 12-13-2015, 03:53 PM
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MotoMagz MotoMagz is offline
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Default Re: 212 predator build

Yep they are 12gauge.. The chart at your work might have been a wire chart which is different . Either way they are nice and beefy... Sorry didn't mean to slap ya they are perfect for a motorbike !
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  #9  
Old 12-15-2015, 06:15 PM
romerider153 romerider153 is offline
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Location: newport ri
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Default Re: 212 predator build

Post pictures of the frame
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  #10  
Old 12-16-2015, 12:09 AM
Amarion1 Amarion1 is offline
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Join Date: Sep 2012
Location: Bellingham WA
Posts: 83
Default Re: 212 predator build

Not much done yet besides getting parts together and figuring out where I want the engine to sit but here she is! Took it to work to do some grinding on the motor mount since my bench grinder isn't mounted

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