79cc predy

What trike base are you going to use because that is a big heavy beast of an engine for a trike, especially if it is mounted in the rear as a one wheel drive, what you will find is when you hit the gas it pops a wheelie and violently spins like a top around that drive wheel.

Been there, done that, and that was with an electric.

OK, cool, so you are center mounting the engine, that is much better than trying to mount it on the back.

I'm building a GT2A-S 4-stroke 3-speed shifter with the 49cc HS and 4G transfer case right now.



If you get yourself a trike axle with a pedal gears you can just drop a 4 or 2-stroke engine and jackshaft kit on it and your set but I am telling you from first hand experience building 3 of these electric shifters that 25 MPH is the max safe speed you can operate them.



A 79cc predator is way WAY too much power and the transfer case alone is over twice what the engine costs.

Just my 2¢ hope it helps.

Re: 79cc predy trike

Scott.D.Lang said:

I want to gear it for no faster then 30 so 25 would be fine. I have road and drove high powered machines all my life so that does not worry me. I may just go with a 49cc kit but would love to try my hand with a predy. I will not know 100% for sure till I get my income tax. so any help and links would be thankfull

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THE most important thing is you are building a trike not a bike, what 2-wheel bike frame to 3-wheel trike bolt on are you going to use (link please)?

I looked at a couple trike conversion kits awhile back but only built factory factory trikes with a right hand drive electrics to a jackshaft type freewheel dual sprocket BB and then out to the trikes rear gears and brake system.

The really crucial part of any trike is where does the power hit the road in lateral relation to your butt and front wheel.

You can't run a straight axle with equal power to both back wheels because you wouldn't be able turn and though there may be bolt on conversion kits with a posi-track type differential to adjust power to the outside wheel on the inside (slower spinning) wheel from maybe Statton, everything I have seen has a split axle where the left wheel always freewheels and the drive and braking is all done with the right back wheel with the brake right where you would want to put a left drive sprocket for an engine.

The 2 wheel preds are a fun and fast direct drive build but that is putting the power under your but not 1.5' to your right...



Ever see a car with a tweaked frame going down the road with the back wheels farther to one side than the front?

It is 10 worse on a trike.

Lets see what you want to bolt on GTA frame and go from there K?

Scott.D.Lang said:

http://www.pistonbikes.com/Motorized-Trike-Conversion-Kit-p/mtck.htm this is the kit I plan on using.

I know all the down falls of trikes I grew up on 3 wheelers my question is simple I just need to know what parts besides engine I need Ill worry about the dangers when I get it together. I ride in the city I dont have curves to worry about much and not looking for speed.

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Yep, that is the 2 to 3 wheel bolt on I have read about.



Figure ~$400 delivered without any rubber but it has the 24" wheels and their own left side motor and pedal drive system, clever.

I think this is the outfit that makes the base and other options.
http://www.choppersus.com/store/category/1/74/Trike-Kits-Parts/

Specifically this base.
http://www.choppersus.com/store/product/740/Trike-Kit-Heavy-Duty-BLACK/

~$200 delivered with no wheels or transfer system but options for a 3-speed system.

If you want to go direct drive gas your choice looks to be the best.
A simple 2-stroke, 24" rear wheels and that gearing you should be able to hit your top speed mark but it'll be sluggish at low speeds.

As for using the GT2-A 2-stoke frame with the gas tank in it your list of 'other parts needed' in short is everything to build a bicycle up from a bare frame, I made a topic here with the specs and parts list this month.
Heck I have $800+ into to my GT2A-S bare frame 4-stroke 3-speed 2-wheel shifter not counting the engine and transfer case!

But considering your needs...

I am mainly building a couple trikes that my wife and I can go shopping ,cursing, and winter riding.

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I suggest you go with an electric shifter kit on an already made 6-speed trike as I mentioned earlier.

No muss, no fuss, no smell, whisper quite, they 'start' with a switch on the throttle and Lithium Ion battery electrics LOVE cold weather.

Sick Bike Parts has everything but the trike and battery for ~$400 here.
http://www.sickbikeparts.com/catalog/index.php?cPath=26&osCsid=7il4bvtko24i4b5j9a8bo0stj2

You just need to pick a voltage (36 or 48V) and the newest LI batteries can bolt right on the bike and get ya 30+ miles before you need to charge them.

I am almost done with my 4th electric electric shifter, this one on a 6-speed Flying Pigeon adult trike with rear band brake for ~$400.
http://www.amazon.com/24-Adult-Tricycle-Speed-Trike/product-reviews/B008TOMXTU

I built a couple on the 7-speed Schwinn Meridian as well but you get the idea, why pay $400+ for just a bolt on kit when you can buy a whole trike for that?

The meridian was the better trike, it came with the frame as one complete trike unit with support struts in a HUGE box but have been discontinued, the Pigeon is their own Chinese design with a 6-speed and lever actuated band brake not a coaster so it's OK your pedals freewheel backward but the rear bolts on like those other kits.

I have pictures of the rear axle bolt on parts somewhere but I can't find them but it would bolt to most any 2-sheel bike as well.

If you want to explore electric trikes you will find this helpful.
http://kcsbikes.com/topic.asp?TOPIC_ID=566
This one even more helpful, my first electric trike build http://kcsbikes.com/topic.asp?TOPIC_ID=497

These two images may help you picture how the motor power is transferred to the drive train easier.





Just food for thought as there are far more mechanical and customizing options with electrics than gas and I look like this when I ride my builds like this...



... especially when I pace 'Joe Spandex' pedaling his A$$ off on his $5,000 bike with a load in my basket sitting up straight and slowly pedaling backwards for effect ;-}