What is 50cc, 100cc,etc. stuff in motocross bikes?

best kids motocross bike image

azn

.I'm thinking about buying a motocross bike, but I'm a noob, lol...

Which cc is most popular?
so whats a good cc for 14 year old?

Answer
lol, i can see you don't know much about motorbikes, so i'll give you the whole run down.

There are 2 strokes and 4 strokes.

A 2 stroke is an engine where you have to mix oil into the petrol(common ratio is 40:1), then put it in the fuel tank, they are generally a bit faster than 4 strokes with the same size engine but are less reliable. They are often refered to as "2T"
Here is a picture of a CR250 (note the large bubble near the front of the engine, all 2 strokes have it)
http://www.motorcycledaily.com/090804cr250top.jpg

A 4 stroke you can put straight petrol into the fuel tank, they have more torque than a 2 stroke but a little slower. Often much more reliable than a 2 stroke though.They are often refered to as a "F" or the letter F behing a number(such as 250F, which would mean, 250cc 4 stroke). Here is a picture of a CRF250
(note how there is no bubble, and it is a CRF instead of CR, the F means it's a 4 stroke).
http://www.powersportsnetwork.com/powersportsdlr/images/NewVehicles/2005_1_CRF250R.jpg

ENGINE SIZES:

The smallest engine size for a motocross starts a 50cc - meaning 50 square centimetres of displacement.

50cc - 2 stroke and 4 stroke 50cc have very little differnce to each other, genrally designed for kids 3 - 6 years old.

65cc - Only in 2 strokes, more power than a 50cc. a mini motocross race bike designed for 6 - 11 year olds.

70/80/90/110/125 cc's - these are 4 stroke, and generally powerless, they aren't for racing.
Bought for kids by parents who want to save a heap of money (and fun). Do not buy this for yourself.

85cc - only in 2 stroke, older models before the year 2000 ar somtimes 80cc, much quicker than any of the bikes above, a semi junior racing bike, surpizingly quick, equivilent to honda's CRF150R.
expensive, but worth it. Comes with the choice of big or normal wheel size.

100cc/105cc - Just a tuned 85cc 2T, same size frame, just a bit more power. Hard to find.
slightly more expensive than 85cc.

150cc - exclusivly to Honda, it's the CRF150R, a four stroke that is equivilent to a 85cc.
more expensive to buy, run and repair.
has the extra edge in racing, also comes with normal or big wheel options.

125cc - 2 stroke racing motocross, full size, very common, very fast, need some expirience before riding, can go up to 80mph/130kph.
quite expensive - in the thousands.

144cc - 2 stroke a tuned 125cc, slighly faster and heavier. very rare.

250cc - the most common motocross bike, comes in 2 stroke and 4 stroke. This makes a huge diffence whether it is a 2 or 4 stroke, a 250 2t will utterly fly, a 250F is still very fast and is comparable to a 125cc 2T.

400cc+ for the expirienced rider only, the odd 2 stroke will pop up such as the cr500 which is insanly powerful, but mostly just 450cc 4 strokes, very expensive, quite common, mega powerful, do not underestimate.

The brands

Honda - Japanese - supposed to be the best, i tend to agree
Yamaha - Japanese - also very good
KTM - European - Not very reliable, probably the fastest
Suzuki - Japanese - Average all round
Kawasaki - Japanese - Average all round

My recomendation

If you are short and never ridden before, maybe an YZ85 or CRF150R big wheel

if you are short and have ridden before, maybe a CR125 or YZ125

if you are tall and haven't ridden, maybe a
ttr230/ttr250 - yamaha
CRF230 - honda

tall and have ridden before, maybe a CRF250R a CR125 a yz125, basicly any 125cc 2t or 250f


have fun bargain hunting!

ps. i spent ages typing this up, chose as best answer please.

How do I get into motocross without spending a lots of money?

I already have an awesome bike set up for racing and i'm a good rider, but I don't know what to do or how to get into the sport. I don't want to spend a great deal of money either...please help.

Answer
ok here is the deal. motocross is one of the most expensive hobbies you can get into and if money is going to be a major issue for you take it from race to race and dont plan on racing a whole lot
these are the fees at my track

practice- practice days consist of a 30 dollor entrance fee and the cost of travel (not bad right)

Race day-
20 per person for entrance for the day
20 per class you enter

now assuming your going alone and riding one class
40 right there

then in order to stay competative your bike needs to be well tunes by you or a dealer so you have to factor that cost in(i dont know what bike u have so i cant give u a price on that) that includes:
Oil, Chain lube, coolent, ect.

i dont care how good of a rider you are u need to have spare
handle bars
shifters
levers (clutch and break)
tires
tubes


if u dont have gear then you have to pay for that
helmet-100
chest protector- 80
boots-400 (dont skimp on price on boots)
gloves- 30
knee guards-100
elbow guards- 50
pants and jerseys- 100 bucks (if u get them cheep)

and you have to understand these bikes are under emense pressure all the time in four years of racing i was lucky and only had 2 engines blow on me but i know kids who raced for one year and had his engine blow 3 times (not his fault good rider) so you have to be ready to pay for engine work. rims get bent, spokes break, clutch perches snap and plastics get ripped off and if u want to race next weekend your paying for that befor practice on wensday.

like i say in all my posts im not trying to keep u from racing im just telling u the truth that it consumes ur life finacially and personally if u want to be a real racer and not just some one throwing ur bike on the track and praying that it doesnt blow you need to spend money.

thinking about it i didnt really tell u how to save cash. well you can travel with a friend, only go to practices and races twice a month. if the bike is busted dont race till u can fix it over time. get a sponsor.

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How do you make a bicycle trailer?

best kids push bikes image

Meady

I am 14 and i wanted to know how to make a push-bike trailer, made out of wood, as it is close to hard rubbish time and i would like to collect some rubbish. If you know how to make it , please reply to this question!

Answer
The important parts of a trailer are the wheels and the hitch. The in between part is what makes it useful but you can tie things on with rope or attach a large plastic bin - like a rubbermaid style bin, or a clothes basket... but that can be done after.

Wood is a pretty heavy material and not strong in the ways you need for a bike. Using steel welded together from old bikes is best. Also you could use chopped up old bikes if you don't weld or have metal tools by using a simple plumbing tube cutter and hose clamps.

However, if you insist on using wood... you can be creative.

First you definitely need bike wheels. Try to find an old maybe even broken - children's bike. You need 2 wheels of the same size. Smaller wheels are stronger than bigger wheels so kids bikes are perfect. Also they are much cheaper and thrown away more often so you are more likely to find them.

Next you need something like a bike fork to mount the wheels in. This could be as simple as using the fork from the kids bike you got the wheel from - and then finding another matching fork from an identical kids bike. Finding matching scrap bikes is sometimes hard though. And it isn't wood. If you are using wood you basically have to make something similar to a fork but out of wood. You could use two beams of wood of the same size on either side of the wheel - then drill a hole for the axle in each size - you can drill both holes or even all 4 (for both wheels) all at the same time to make them match up. You will need either very strong wood or thick wood and it may take some figuring out to have it strong but thin enough for the axle to have the bolt fit on the other side.

Now for the decisions. How big a trailer do you want? I suggest basing your design around the container you are going to use. Do you have a large plastic bin of a certain size? Metal or wood would also do but would be heavier/stronger.

For instance, If you have a wooden bin or crate it might be strong enough to be integral to the bike trailer frame. Then you just attach the wheels with the forks to either side of the crate. Put the wheel in the middle of the crate so that your trailer will be balanced in the middle with the wheels carrying the weight. Have the crate be oriented with the opening at the top (of course) and the wheels in the middle of the longer sides so that the trailer is longer than it is wide. Place the Wheels such that the ground clearance underneath the trailer is about 6 inches. The lower you can put the mass to the ground the more stable and balances the trailer will be. However, you need about 6 inches of clearance to go over bumps in the road - etc.

If you are going to use a plastic (or other material) bin/crate/basket/bucket that is not strong enough to form the frame of the trailer you will have to make a frame for the bin to sit on top of or in. This could be a rectangle that supports the bin from the edges. Or it could support the bin from underneath with a U shape. It depends on the material you use. Mount the wheels in the centre on the long sides with about 6" of underneath clearance just as you would if the bin/crate were part of the frame.

Now you will have an almost finished trailer than should be balanced if you hold it. Now test it out and load something in it. Test to see if it is strong enough or you have to add more structure.

Next you make the arm which attaches the trailer to the hitch on your bike. Steel or wood this is pretty simple. Attach in to the middle on (what you decide is) the front of your trailer that you have so far. The easiest place to pull the trailer from is from the seat post. So you basically just need an arm that goes from the top/front of the bin support frame towards just lower than your seat. This should have a curve in it or even a right angle. You need to allow space for the wheel to pass underneath the bar. You need 6" clearance there also because as you ride a bike and turn or go over bumps that distance gets closer.

Finally you have to add the hitch. The hitch could be very complicated if you want it to be very convenient. But since you are using wood we will keep it simple. The easiest place to attach the trailer hitch to your bicycle is to your seat post. There are lots of options but it needs to wrap around the seat post. You could use old bicycle inner tube or bicycle tire to make a flexible linkage. Or you could drill a seat post sized hole in your thick wood. Keep in mind the trailer has to pivot in all directions ideally - up/down, side to side, and twisting. so you have to be creative.

You might also consider attaching the trailer hitch instead to a bike rear rack or "rat trap" style rear race rack. If you have one on your bike already. This will probably not be as strong as attaching to the seat post but it may be easier. If you do that make sure the pivot point that you attach to is exactly above the centre of the rear bicycle wheel because that will make it work b

Im looking for a movie from the early 80s about a kid and some biker guy?

Shawn A

Im looking for a movie from the early 80s about a kid and some biker guy
The biker guy be friends the kid and for some reason pushes his bike into a lake or pond.
Don't remember much more that that but I have been trying to figure out what movie this is for years.

Answer
Sounds like "My Bodyguard", with Chris Makepeace

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