For the brave at heart but unexperienced at knowing what makes speed. I would say do the math. Check out the tires are they ready for that kind of load and the wheel rpm for small wheels. Then a small mater of good brakes a scrub brake might throw you on the ground in a flash and to little brakes will lead you to a crash and burn results.
The McCullough 101 go kart engine will produce a ton of what is needed to make this mini bike go that is Horsepower and RPM the weight to power ratio is great and the compact size of the engine will allow it to fit the frame. I say wheels need to be at least 8 inch in diameter and if passable a front brake would be good. A McCullough 101 will work on stock or modified fuels and it is not to hard to get 15+ horsepower and still be able to rope start this engine but most karts use an auxiliary starter to fire the motor.
I have been there and done that when I was let's say young and dumb and I have my share of great stories to tell about all the road rash and miracle escapes from the law. Back in those days a trip to an emergency room was a $100.00
But you go have your fun and take pictures along the way I wish I had some pictures that aren't just in the back of my mind.
Steve
The McCullough 101 go kart engine will produce a ton of what is needed to make this mini bike go that is Horsepower and RPM the weight to power ratio is great and the compact size of the engine will allow it to fit the frame. I say wheels need to be at least 8 inch in diameter and if passable a front brake would be good. A McCullough 101 will work on stock or modified fuels and it is not to hard to get 15+ horsepower and still be able to rope start this engine but most karts use an auxiliary starter to fire the motor.
I have been there and done that when I was let's say young and dumb and I have my share of great stories to tell about all the road rash and miracle escapes from the law. Back in those days a trip to an emergency room was a $100.00
But you go have your fun and take pictures along the way I wish I had some pictures that aren't just in the back of my mind.
Steve
well i plan on goin 60-70 on a 1/4 mile.
nothing fater than that.
i would even be happy doin 55
if worse came to worse.
and i am looin for a good helmet aswell
i plan on running a disc brake.
and most likely even a wheelie bar,i 'm 200 pounds and i'm insured throught kaiser and blue cross.
i was kinda leaning towards a animal motor or maybe even a alcohol 1 if i cand find 1 for a decent price.
whats are some of the mods people have done to a animal motor and how fast did they go?
nothing fater than that.
i would even be happy doin 55
if worse came to worse.
and i am looin for a good helmet aswell
i plan on running a disc brake.
and most likely even a wheelie bar,i 'm 200 pounds and i'm insured throught kaiser and blue cross.
i was kinda leaning towards a animal motor or maybe even a alcohol 1 if i cand find 1 for a decent price.
whats are some of the mods people have done to a animal motor and how fast did they go?
Ok, you have Kaiser, good, and you are shopping for a good helmet.
Well now you can start your design process, Minidragbike is obviously a great resource, those guys are fast and have already built race proven minis in several configurations, race ready minis of that caliber could cost three grand or more I'm sure.
In an effort to keep your costs as managable as possible I would suggest that you start with the biggest engine that you can shoehorn into your frame.
Well now you can start your design process, Minidragbike is obviously a great resource, those guys are fast and have already built race proven minis in several configurations, race ready minis of that caliber could cost three grand or more I'm sure.
In an effort to keep your costs as managable as possible I would suggest that you start with the biggest engine that you can shoehorn into your frame.
That is the exact opposite of what you want to do. Find out what mods need to be done to each engine to meet your goal and pick what is in your price range. Building a high horsepower 390 is not cheap. Everything for bigger engines costs more. An animal or GX200 would probably be best imo if you want to keep the costs down. A good example of this is a GX200 piston is $19 at NR-racing right now. They don't make GX390 flat top pistons, so you need to buy a Honda probably about $25 if I remember then have the dish machined out which will cost you more.
Hydraulic brake setups go from $150-$200 plus all the parts for the live axle, bearings, sprockets. So your looking at about $250-$300 just for a live axle set up, if you want the best.
If you go to a taller than a 6" Kart wheel that will also cost more. You would be looking at a Jr drag wheel and tire, which is probably around $125.
Machine work will all add up, also.
All in all, you need to have a budget in mind. A definite speed, 55-70 is a huge range and can mean a big difference in cash. Are you going to ride it around? If so, alcohol is probably not an option, it is tough to have the engine idle a long period of time running on alcohol and burns much more fuel.
Hydraulic brake setups go from $150-$200 plus all the parts for the live axle, bearings, sprockets. So your looking at about $250-$300 just for a live axle set up, if you want the best.
If you go to a taller than a 6" Kart wheel that will also cost more. You would be looking at a Jr drag wheel and tire, which is probably around $125.
Machine work will all add up, also.
All in all, you need to have a budget in mind. A definite speed, 55-70 is a huge range and can mean a big difference in cash. Are you going to ride it around? If so, alcohol is probably not an option, it is tough to have the engine idle a long period of time running on alcohol and burns much more fuel.
Youll have no problem doing 60 it just depends how fast you want to get off the line. Most minis iv riden just run out of gearing and thats your top speed. If you gear it way up you can easily go much faster. Hp plays a part but not as big a part as youd think. I had high gearing on my chopper bike with a 5hp fun power briggs and it would do 60 how i had it geared but it wasnt that powerful off the line and heated the clutch up too much and going up hills was a bear so i geared it down a bit now it probrobly does about 40 but gets there quick. Your going to want a long wheel base and low center of gravity. Wind resistance is also important so its better if your laying down on the bike
Oops... clarification, as an old school hot rodder, I was making reference to the philosophy that there is no substitute for cubic inches when it comes to producing economical horsepower, sorry Stang, I just meant that it may be cheaper to have a mildly built 390 rather than a full blast 200 to acquire the same results.
I guess that if the requirement is to do 55 or 60 in the quarter mile then my electric E-Rex concept may be a good candidate as it can easily meet that requirement and still be tame enough to be ridden around in the pitts between races by the wife wearing a dress with a fruity drink in her left hand.
I guess that if the requirement is to do 55 or 60 in the quarter mile then my electric E-Rex concept may be a good candidate as it can easily meet that requirement and still be tame enough to be ridden around in the pitts between races by the wife wearing a dress with a fruity drink in her left hand.
NP new age, and thats pretty correct for the most part. It really just depends what he wants to accomplish. I have a 390 myself but I didn't really put a budget on the project and I can tell you, its far from cheap. Where as he could build a fairly decent GX200 hit 60 mph and probably save himself a few bux. If he wants to be the fastest on the block then thats another story.
Larger motors are also alot more difficult to get RPMs out of and that is also your friend when it comes to top speed.
Larger motors are also alot more difficult to get RPMs out of and that is also your friend when it comes to top speed.
The first thing I would say you need is a good foundation to mount your power plant to. Go over your entire frame & make sure every joint is thourghly & completely welded. And every suspect area (wheel mounts, triple tree) is reinforced/braces/gusseted/etc/etc.
Theres nothing pretty about having a frame bust in half or a wheel coming off at high speeds. Once you have done that then you can worry about power. I'm pretty sure a GX 200 with a few bucks in it will get the job done. And you'll still have plenty of low end grunt to get the thing moving. If your looking for price examples I've got right around $600 in my GX200 clone & it should be in the 13-15hp range.
With that kind of power all you really need to do is find the sweet spot with the gearing & you should be all good. Just make sure you can stop that thing. I heard if you lock out your knees with your feet forward & then bring them both to the ground at the same time wearing some military boots works really good for bringing things to a hault???
Theres nothing pretty about having a frame bust in half or a wheel coming off at high speeds. Once you have done that then you can worry about power. I'm pretty sure a GX 200 with a few bucks in it will get the job done. And you'll still have plenty of low end grunt to get the thing moving. If your looking for price examples I've got right around $600 in my GX200 clone & it should be in the 13-15hp range.
With that kind of power all you really need to do is find the sweet spot with the gearing & you should be all good. Just make sure you can stop that thing. I heard if you lock out your knees with your feet forward & then bring them both to the ground at the same time wearing some military boots works really good for bringing things to a hault???
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wow alot of great feedback, could some1 school me on a GX200? maybe a pic and some info on it would be great.i'm not too familiar with that engine.
i had the animal motor in mind, but also thought of running alcohol depending on the cost,since i will most likely only run the bike on sundays, maybe 2 or 3 passes or so through out the day.
i myself like having a good take off comin out the hole, rather that top end. rather than waiting for that moment to kick in.
does any1 know of a good website or a place in the LOS ANGELES area that builds, sells motors or has parts for em.
any info would help.
i had the animal motor in mind, but also thought of running alcohol depending on the cost,since i will most likely only run the bike on sundays, maybe 2 or 3 passes or so through out the day.
i myself like having a good take off comin out the hole, rather that top end. rather than waiting for that moment to kick in.
does any1 know of a good website or a place in the LOS ANGELES area that builds, sells motors or has parts for em.
any info would help.
stretch the frame, preferrably some type of suspension, a GX390 (honda 13hp) with a torq a verter from Northern Tool. The cool thing though about B&S's is you can shave the head and get more compression, use a slide carb and a header, that'll get ya there. But Jeep is right, gearing is everything. I've seen barstools with a torq a verter do 50 with a stock 5hp.