Dirt Bike FAQ

What kind of bike is it? I'm guessing a CRF100 or XR100? what year is it? Check ebay!

Is there a Queue of people out there waiting to ask the same kin question. when you typed the "what size dirtbike do i need " Y/A automatically tells you we have found similar questions. why don't you read some of them. this question in one form or another is asked every single kin day.
use the Discover tab and find thousands of answers to you question and take your pick.
don't they teach you people to read anymore.

You just did a motor job.
-Double check the valve clearence.
-Make sure the valves aren't leaking. Bring the piston to TDC of the compression stroke (both valves closed). Remove the spark plug. With a blow gun, blow air in the plug hole and listen at the air box and exhaust pipe. Any hissing and you need a valve job.
-Double check the points and timing with a timing light.
-There might be water in the gas. Water floats in gas. If it was in the carb float bowl, when you rev the motor, the water would get sucked into the jets, clog them and drop back into the float bowl.
-Drain the float bowl into a cup and see what comes out. Anything bad, drain the tank and install an inline fuel filter.
-Clean the carb and jets with carb cleaner in a spray can.
-The float level could be to low. Remove the float bowl. Hook up an auxilery fuel supply. Turn on the fuel and lift the float by hand. -The fuel should stop when the float is level with the carb/float bowl mating surface.
-Try adjusting the needle height (on the throttle slide in the carb). Adjust the circlip up or down one notch at a time.
-If you can't get it fixed from all the answers you get here, then it's time to have a mechanic look at it.

Idk, but here are some help:
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http://www.dirtbikefanatic.com/kids-dirt-bike.html
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Turn your fuel petcock to off remove the fuel line from the carb. there will be a little bit of gas that drains out have a rag handy then get a gas tank and point the petcock into the gas can and flip your petcock to reserve it will take 2 min.

Axiom and Wellgo both offer good affordable pedals with replaceable studs.A cromoly axle is best.
The best pedal is one that has an owner with a good pedal nut tool.
I always rebuild my pedals with good bearing grease when new.Filling the bearings with grease will help keep dirt and water out of them.My favorite bicycle grease is Bullshot.[red]
The best bearing grease I have ever used came in a caulking tube and is used by long haul truckers to lubricate their trailer connector contacts where the trailer meets the tractor[truck].[it was red]

Riding boots, you want to keep your feet looking good. I have seen feet crushed, gashed, burnt etc. Be safe first. They are making girls gear more girlie now. Great to see women ride.

Depends on what your style is me personally would get a 250 sice your pretty big and only thirteen you will grow pretty fast. a 125 was made for a 180 or lighter person so you will weigh more than that in the future probably. Also, with racing a 4 stroke is alot more work in the long run. So if you you have someone to service it or if you know how definetly go for the 4 stroke (crf250) If not cr250 or yz250.

Had the same exact problem, i just sold mine in cali to someone without the title who had their own land and i bought a new one. besides it's a good excuse for a new one

What's the difference between a 2-stroke engine and a 4-stroke engine?
Gasoline and diesel engines are both available in either 2-stroke or 4-stroke versions

In a 4-stroke engine the sequence can be written:

Compression Stroke. The piston goes up and compresses a fuel/air mixture (in a gas engine) or just air (in a diesel).
Power Stroke. The fuel is ignited (by a spark in a gas engine, by being injected into high temperature air in a diesel.) The energy released drives the piston down. This provides the momentum necessary to keep the crankshaft turning and make the other three strokes happen.
Exhaust Stroke. The piston goes up and pushes the burned gases out the exhaust valve.
Intake Stroke. The piston goes down and draws in new air, or fuel/air mixture, ready for the next compression stroke.
In a 2-stroke engine, the last three strokes are combined into one.
Compression Stroke. The piston goes up and compresses a fuel/air mixture (in a gas engine) or just air (in a diesel.)
Power Stroke. The fuel is ignited and drives the piston down. As the piston goes down it not only turns the crankshaft but also pressurizes the fuel/air mixture in the crankcase which is about to be admitted to the piston for the next cycle. Near the bottom of the stroke, an outlet opens and the exhaust gases are released. Even nearer the bottom of the stroke, an inlet opens and new fuel/air (which was just pressurized by the piston) rushes in ready for compression.
Because a 2-stroke engine gets a power stroke twice as often as a four-stroke engine, it puts out about twice as much power (and makes twice as much noise) as a four-stroke engine of the same size.

The downside is that, because the 2-stroke engine is sloppier about how it expels exhaust and takes in fuel, doing them almost at the same time, it is more polluting. Also, the 2-stroke engine lets fuel into the crankcase, where the piston can pressurize it prior to intake. In order to keep the crankcase lubricated, you have to add expensive lubricants to the fuel, and even so, 2-stroke engines don't last very long.

So 2-stroke engines are used in chainsaws and lawnmowers, where power/weight is important, but the engine isn't used for long periods so pollution and engine life are less of a concern. The continuously used engines in cars and trucks are 4-stroke engines.