69/80cc kit help

T

thavionhawk

New Member
I'm a noob. I've come here in search of advice on picking out an engine for my bike. All that I've read has told me that a 4 stroke 69/80cc kit is what I should get owing in part to my 6'3" 205lb body and the fact that I'll be dealing with a few hills.

Now if I could get away with a smaller engine I would go for that, but it's got to be 4 stroke in my book. Worth the added money to not have to deal with the 2 Mix.

What I'm getting at is this. What kit(s) would you recommend?

My bike is a Schwinn Beach Cruiser. Single Speed, back peddle breaks. I picked it out because I kept seeing that sort of bike being used for this sort of thing and well, it looks cool and rides well even with fixed gearing.

I know there are good and bad deals out there, I hope you guess can help me out.
 
First things first. 2 Stroke kit motors or, "chinagirls", as they are affectionately called, come in two sizes: 50cc (47,48,49,50), and 66cc (66,68.5,69,70,80). These are all basically a crapshoot. All made in china, they are usually of very similar quality across all brands. The main thing here is to get them from a reputable dealer, so that if it is a bad motor, you can get a replacement or warranty or w/e.

4 stroke kits generally only come in 50cc size. There are larger motors available but you have to do everything custom, not as a kit. The 4 stroke kits generally use a Huasheng 142 motor or the Honda GXH-50. The huasheng is a chinese clone of the honda. It's still pretty good. These kits will come with a number of different gearbox/transmissions. Avoid the ones with a Hoot gearbox, or a Hoot chainbox. I have heard the Skyhawk 4GT kits are pretty good, however that the EZM Qmatic is much better. I would say it's the best. Heres some pics.

Hoot Gearbox: http://img.auctiva.com/imgdata/7/3/0/8/2/8/webimg/123675775_o.jpg
Hoot Chainbox: http://i768.photobucket.com/albums/xx324/damo9999/49cc_engine_kit_03.jpg
Skyhawk 4GT: http://i.ebayimg.com/00/$(KGrHqQOKiYE1fLj12ytBNc3Dj2!-g~~_35.JPG
Qmatic: http://motorbicycling.com/attachments/f23/19744d1265070216-ezm-information-q-matic-q-matic.jpg

As for which motor, the 2 stroke 66cc will have more max power than the 4 stroke 50's, but the 4 stroke will have more low end torque. 4 stroke also sounds better (in my opinion), and generally gets better fuel efficiency.
 
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The low end grunt is what I'd want for hill assist, though I could convert that into higher speed by gearing it up a bit more... Well all I know is I'll build it as it comes then any mods will come down the line.

4 stroke 50cc it is. Thanks for your advice.
 
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