Performance 80cc

NBP MotorSports

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Ok, I have searched and really didn't find what I want to know. Here it goes.
Building a "Motored Bike" more for show and speed.
Has anyone used R/C racing fuel? Is it cool to run it instead of gasoline?has anyone bought parts from http://www.pocketbikesunlimited.com/index.html
I want to build something like a drag bike.

This is what I'm starting with;
 

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well, no...r/c racing fuel is 20% nitromethane and it is closer to diesel fuel than it is to gasoline.
to run nitro, you need a heck of a lot of compression and a major ignition system to fire the nitro. r/c racing fuel is not like the nitro that is used in a top fuel dragster.
r/c nitro has a lot of oil content and an r/c engine fires the nitro on compression, there is no spark plug. (like a diesel) it has a glow plug with is there to heat up the cylinder not so much to ignite the fuel. these little engines don't have a ton of compression, and all you need is 87 octane gas. even if you go with a hig compression head,k the compression still won't be high enough for nitro.


if you want low end torque and decent top speeds, you should consider going with a shift kit, milling the head,(or go with a high compression billit head) putting on a cns type carb, a billit intake, port and polish the intake and exhaust, an expansion chamber, upgrade to an 8 mm spark plug wire with a rubber boot, an ngk spark plug and a high flow air filter. and if you still need a little boost, you could put a nitrous kit on it, but i'm pesonally not sure how well they work.
there are a lot of things that you can do to these little engines to get more power out of them.

you can increase your top speeds by going with a shift kit. a shift kit will give you the best of both worlds...low end for take off, and top speed. i think a shift kit or gearing (for single speed bikes) is one of the simplest ways to get more speed out of one of these engines. but if you just change the rear sprocket to a smaller one, you will lose torque for take off. that's why i mention a shift kit. besides, what can be cooler than banging through the gears on a bicycle with an engine on it?

I like what your thinking tho, and a drag bike would be awesome looking if it's done right.
so, i think you would be able to give the engine some more power to go along with the drag bike looks, but don't expect too much out of it. I have heard claims of bikes being able to go 52 mph with shift kits on them, with stock engines, but i have no idea how true that claim is. you should also consider a major brake upgrade too if you are planning on trying to get into the 50 mph range. disk brakes would be the way to go.
I want to build a drag bike too, but i want to do it with a stretched and lowered 20" frame.

I'm not an authority on this subject, i'm just offering some suggestions based on things i have personally done to one of these engines, and things i have read about.
 
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OK, so the Nitro fuel is out. I have looked at the NOS system, wet and fogger. I hear that the wet system is better for the motor than the fogger. Butt... the wet system is $350-$600, and the fogger is $40.
Now the carburetors I'm looking at start at $69-$290.
I haven't found the tranny for it yet, but that would be something I would like to add.
I'm also looking for a kick start too(if they make it for this type of motor).
I think I'm going to port and polish the head today. Clean it up a little for better airflow.
I'm working on a "tornado" spacer to help atomize the air/fuel mixture better.
 
Woah, always wanted a 125 hp snow blower. :devilish:

it's not saying that it will give you 125 horsepower, it's saying that it can support up to 125 horsepower.
I'm starting to wonder how well this would work on one of the h.t. engines.
or would it be a waste of $$?
it sure would look and sound cool on a bicycle tho.
 
LMAO... It would probably be a waist of money. But I think I might get one to play with. Come on, its a "TURBO"!
 
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yeah it would be fun and it would get you lots of compliments just by it's looks.
sometimes, form wins over function in my book.
but it is expensive, you could buy 2 new complete engines for what it costs.
who knows, maybe it would even add a little bit of power.
any little bit helps with these engines, but would the gain(or possible no gain) justify the price?
 
Yes, I've got a 475 hp snow blower .................... Hard to hold, but does a great job.............!
 
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