Hello , all I'm new to the forum. I'm looking to get my chain to clear the rear tire with is 4.0 big. Ive been doing my own research and came up with the BikeBerry Sprocket Adapter as an option . Firstly how do I figure out of I need the 1.0 or the 1.5 hub also will this item work. Or is there any cheaper alternatives. Here are a few pics I'll post more if needed.
My 1st 80cc Fat tire Evo
- Thread starter djat806
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bakaneko
Well-Known Member
He could be just fine and dandy, and don't post much. I've seen these fat tire 2-stroke builds before and they work fine. He just needs to upgrade his brakes or at least the front brake.
Hello Moto!
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Hey KC, is the bike you have pictured a FITO Modena? I've actually come across that bike when I was looking for something better than my roadmaster to put a motor on. You did an excellent job. I really like the front forks on those bikes. It just looks like it was built for a motor lol.
KCvale
In memory of KCvale 1959 - 2019
Yes Moto, this a motorized Fito Modena GT 7-speed.
I have never cared for straight hard triple-tree forks, too stiff and they hit the top bar when you turn, hence their bumpers.
They are pretty cool with a real shock fork though.
It adds ~$100 to the cost but worth every pothole and speed bump you hit and don't feel.
They don't make the silver one anymore, just black now. What a dumb move in my opnion.
I tried to make the top tube a gas tank. Though it can be done it only holds a couple cups of fuel if memory serves, not enough to be useful.
If you want pictures and details about how I did the 'top mount' gas tank they are here.
http://kcsbikes.com/topic.asp?TOPIC_ID=793
The second bike used the 'extended tank bolts' mount. It doesn't look as cool but is much sturdier.
The solution to the top bar not being big enough is a similar frame that has a tank built in.
Hence the new GT2-150 gas tank frame mods for fatter tires and a rear disc brake, my Fito builds spawned the frame changes.
Ya I know, different engine, but the premises is the same.
I just move the Fito's parts to the GT2 gas tank frame.
I suppose I should do a Silver 2-stroke just for comparison to motorizing a Fito but I'm sick of 2-stroke and moving to 4-stroke.
The GT2 frame is longer so it's wouldn't be to scale against a Fito, but the frame has a 2-stroke mount.
The big factor is the added cost vs. benefit.
That is a topic for another day but that is the basics of using the Fito as a base, hope it helps.
KCvale
In memory of KCvale 1959 - 2019
Chances are high you are living.
O
oogaboogaman
Guest
Welcome djat,
Just a note, there is no such thing as an 80cc, it's a 66cc for accurate future reference ;-}
Unfortunately just moving your rear sprocket out won't do it.
That 415 chain has to be in alignment.
Your engine sprocket is inside the tires width mounted to the seat post, ~2.25" tires is all it can get by.
That means either also making an offset 2-stroke engine mount for front and rear, use a different system like a friction drive, or just 'jackshafting' your engine output to the right hand side and using the pedal system to drive the wheel.
SickBikeParts has a 2-stroke JS kit that works well for $200.
http://www.sickbikeparts.com/catalo...ducts_id=86&osCsid=rg0jf2im21ou0prpq2sfsuihc2
You mount the engine to the JS base, then mount the unit to the bike, and then change out your bottom bracket pedal system that will share the pedal drive with the engine and not beats your legs off.
Read the install instructions as it's complicated and may be above your skill/tools level but what I use for everything with over 2.25" tires like this one.
No extra back wheel sprocket, the engine goes to shaft.
Then, you use the pedal side which is already wide enough to clear your fat tire on the right.
Bummer you have no rear wheel gears you could use with it as well, but it's better than trying to go the other way as you want your engine secure to the frame.
I know this thread is pretty old but I'm building a motorized bike and my bicycle has a 2.25" rear tire on it, do ya'll know if the stock sprocket will clear the tire and if not can I put a slimmer tire on the same rim? Maybe a 1.95" or 1.75". Thanks if any replys.
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KCvale
In memory of KCvale 1959 - 2019
2.25" is beach cruiser size and will work but you will need to trim the fender if it has one.
Also note that white walls don't stay white very long with a properly oiled chain however...
Also note that white walls don't stay white very long with a properly oiled chain however...
Last edited:
KCvale
In memory of KCvale 1959 - 2019
You might want to spin your head around so the spark plug points forward.
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