79cc MTB official build thread

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ultralight01

ultralight01

New Member
Oct 30, 2016
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Hood River, Oregon
I swear, it was totally worth it. Besides the rag joint, there's not really any cheaper options if you don't have a rear disc hub. Maybe $40-$50?

Hey, I'm goona have 500-600 in this build when its over, about the price of a moped. But this can go everywhere, without a license or registration. Plus, I get to build it. I want it To LAST, not like my 2 stroke kit bike. And the power of this engine would tear out my spokes with a rag joint.
 
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TheNecromancer13

TheNecromancer13

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Jan 21, 2015
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Portland, Oregon
Potato_In_Exhaust said:
^^ 66 dollars?!! Sixty-SIX DOLLARS?!! Good lawd have mercy on our souls! :(
Click to expand...
That's nothing. I actually went a step further and got custom sprockets made by rebelgears for my last bike because I wanted a 40t 420 chain sprocket with a hard coat that would bolt onto a 5/8" mini hub. Cost me about $80 just for the one sprocket, but it was worth it. Here's a pic of the sprocket:



EDIT: I can't wait till I can start machining my own sprockets.
 
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Tony01

Tony01

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Nov 28, 2012
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sf bay area
Xct forks are the lowest of the low. Worse than rst low ends. If you're set on 1-1/8 swap it for an xcr. Or go with an xcm in 1". Xct < xcm < xcr.
 
ultralight01

ultralight01

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Oct 30, 2016
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Hood River, Oregon
Thanks Curtis! I'll be back home on the 22nd and working on this. Man, I just went cycling for 20 miles, there is definitely some benefits to normal cycling! But that seems not what this forum is about exactly. :D
 
mobike91

mobike91

Member
Sep 14, 2010
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lebanon, oregon
How far have you gotten on your bike since your last post? Iv gotta say, im really impressed with what you've done so far and how custom you are building your bike especially at your age. You must have a good amount of resources at hand and some good teachers to have helped you know how to use so many tools and such. I got into engine kit bicycling when I was 17 cause I lost my license. Now I'm 26 and just play with them for a hobby. I built a 2 stroke recently that was geared down so bad you had to pedal it to 20 then hit the motor lol. It does 50 at about 3/4 the Rpms from max. It's on a 700c style hard frame bike. I like your build so far. I just ordered a 79cc 4 stroke kit to play with next. Found a nice trek disc brake bike to build it on too. Btw I'm in Lebanon Oregon.
 
ultralight01

ultralight01

New Member
Oct 30, 2016
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Hood River, Oregon
Hi will,
I appreciate the post. I've been in Cali for two weeks and I'm on my way back Wednesday.
My father had a lawn business for 10 years and has collected a lot of tools for working on his commercial equipment.

As far as tools go, I taught myself with the help of some forums like this one. I'm a fast learner, and engines were like Legos to me.

As far as resources go, I'm thrifty. But I also made a nice chunk of cash from rebuilding go karts up to about four months ago when I sold my racing kart.

I'm ordering parts for this bike still. I have about $100 in parts to order until it's perfectly finished. I'll update as I add the headset, handlebars, alternator, etc.

I'll be looking forward to your build too. I was inspired by TheNdcromancer13, another Oregonian in Portland that made a trek 79cc.
 
ultralight01

ultralight01

New Member
Oct 30, 2016
337
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Hood River, Oregon
Slowly progressing. Had to machine an adapter for the sprocket adapter. Haha. It was for a 1.5" hub, and mine was like 3/4 of an inch. That took like 5 hours to perfect. Also got the new extra large headset in, by cutting a few slots to make the head tube larger.. I've been pretty busy on other stuff, but I'll get to finishing this soon.

I'm thinking of making fiberglass panels to hide the engine mount and some other messy bolts and such. Maybe a convex headlight shroud on the front to.

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