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Motocross
Category about motocross bikes and riders, both past and present. Questions range from general motocross trivia and how-to's to personal opinion questions. There are straight-up answers, as well as answers that provide links.
2,133 Questions
What year Suzuki motor VIN F114-107107?
sorry not a 2007.
the f114 only came in one bike....
1989 suzuki rm125
the 1988 rm125 motor number was f113
How do you fix lost compression on a 1985 suzuki 125 rm?
My 85 suzuki rm 125 is bogging when i ride it it idles like it should but when i give it throttle it boggs i just put a new piston rings in went thru everything i was told that its likely to be the needle valve or something like that is it tru if my bike has been bored out that i nd to change the valve help please i just wanna ride sincerely shealynn
How do you start a dirt bike without the key?
You can start it very easily, Cut the wires leading to the key and if there is only 2 you should be able to recreate the currency of a key and start it up.
How much does a full set of motocross gear cost?
The answer depends on the quality of the gear your looking for, and how much you willing to spend. another factor is the optional protection.
heres some estimates.
helmet: $90-$600
goggles: $25-$60
neckbrace: $100-$400 (optional, but highly reccomended)
chest protector: $75-$100 (also option and highly reccomended)
jearsey: $20-$40
pants: $90-$200
gloves: $15-$50
boots: $100-$500
knee pads: $15-$30
socks: $15-$25
So for top of the line, fanciest gear possible, your looking around $1500-$2000
i normally spend about $500 a year on gear. helmets, boots, neckbraces and chest protectors will last you awhile so you hardly ever will have to pay the $1500 at one time. if you new, start off with the cheap stuff. that way your only spending a couple hundred on gear. guys i race with, that have the gaerne boots, nad shoei helmts(those alone are around $1000) probably spend more than a few thousand a year on gear. if you have the extra money, don't hesitate to buy some spare gear.
like..
3 goggles, 2 jearseys, 2 helmets, 2 pairs of riding socks, 2 pairs kneepads.. etc.. just in case something breaks or gets lost. Hope this helps :D
Ride safe!
What is the fuel mixture needed for a 1991 Kawasaki KDX 250?
i run 40:1 in mine, i have the same bike
What year is KTM bike frame number 550 01219?
There is not information on the year of a bike with the frame number 550 01219.
They have a VIN on the frame but can be hard to find and are not all in the same spot.
Is 5ft 7'' to big for a kx 85 big wheel?
You would fit, but if you're still growing, I'd recommend a bigger bike such as a 125cc. If you're stuck on two stroke bikes (like me) then you should buy a used 85cc because you will grow and need to switch to a 250cc in about a year.
Lyn-z Adams Hawkins..
Google would of answered that for you, just saying..
How do you whip on a dirt bike?
Apply pressure (leverage) to the foot pegs/seat/frame/tank/handlebars in different combinations to vary the severity of the "cross-up". Take off from the jump at a non verticle angle (leaned over). Usually have to apply opposite pressure/sequence to return bike to proper angle for a safe landing.
A whip is when the rider rotates the motorcycle sideways in a "whipping" motion while in the air.
longer gearing needs less teeth on rear sprocket ( more mph if you've the excess power)
Adjusting rear suspension on 2001 Honda XR650L?
This is a good thread on 650L suspension settings with some links on setting sag at the bottom of thread: http://www.thumpertalk.com/forum/archive/index.php/t-694379.html
How tall is a 70cc dirt bike in inches?
It depend on bike different bike have different height. But 36" At Handlebars - 24" At Seat is the approximate height of any bike.
The Ktm would win but not by alot considering its lighter and has more ccs but in motocross it's all about the rider
What does a expansion chamber do for a dirt bike?
it is used to increase the horsepower of the engine (see this page for a photo). This technique only works on two-stroke engines, which is why you see it on a lot of dirt bikes but not on street bikes. Most street bikes use four-stroke engines.
The basic idea behind an expansion chamber is to use the momentum and pressure of the exhaust gases to create a pumpthat squeezes more air and fuel into the cylinder during the intake stroke. It does the same sort of thing that a turbocharger does, but it does it without moving parts.
If you have read How Two-stroke Engines Work, then you know that the exhaust and intake parts of the cycle overlap. As the piston moves down, it uncovers the exhaust port first to let most of the exhaust out. Then it opens the intake port to let fuel/oil/air in. With a correctly-tuned expansion chamber in place, two things happen to help the intake process:
- As the exhaust gases expand into the expansion chamber, they create a vacuum at the exhaust port. This vacuum pulls fuel/oil/air into the cylinder.
- As the shock wave of the exhaust pulse hits the end of the expansion chamber, it echoes back, pushing any fuel/oil/air that got pulled through the exhaust port back into the cylinder. This page has a nice graphic that describes the process.
By pulling extra fuel/oil/air through the cylinder and then pushing it back in, the expansion port has the effect of stuffing more fuel/oil/air into the cylinder on each stroke. This gives the engine extra power in the same way that a turbocharger does.
Here are some interesting links:
- How Two-stroke Engines Work
- How Turbochargers Work
- Building your own racing Expansion Chambers
- Exhaust Pipe "Theory"
- Tuned Pipes
