How Do i start my dirt bike?

Question

I have a 125cc, 4 stroke engine, clutch, kick start dirt bike. I am heav trouble starting it up, what do I do?

Answer 1

It may be that you have flooded the spark plug.  I know that they say this doesn't happen with 4 strokes but it can.  You may have gotten too much fuel inside the spark plug and it will hinder the process of making a spark needed for combustion.  Try taking the spark plug out and drying it with a lighter and air.  Better yet I reccommend you have a new spark plug.  Also drain your gas tank and put new fuel in it.  Once you have new fuel and a good spark plug here is how you crank your motorcycle.

1--Open the choke to "full Choke"  This will allow the carbuerator to inject just the right amount of fuel needed with the correct air mixture to crank a "cold" engine.

2--DO NOT TWIST THE TROTTLE WITH THE CHOKE OPEN---I assume you have been doing this and flooding your motor.   Hands off the throttle when engine is cold.

3--Smooth, solid kicks on the kick starter---Short choppy strokes will not create enough compression to start the motor.

4--Find Top Dead Center--This is the point of your kick start stroke that will allow you to have the longest stroke when you kick.

5--Kick the kick starter until the motor starts  and leave the choke on for 1-3 minutes until the motor begins to run smoothy.

6--Do not operate the Throttle until the motor runs smoothy--you could flood your motor after you start it if you push the choke in too soon.

A 125cc 4-stroke does not have a lot of compression so you should not have much trouble kicking this.   I suspect you are attempting to crank your motor without the choke and you are using the throttle and not letting the choke push the fuel to your motor.

I hope this helps.

OH YEAH!!!   I almost forgot to add.  After you have rode the motorcycle you can most likely crank it with 1-2 good swift kicks with the choke off.   The first start of the day (cold motor) will have to be with the "Choke on" and HANDS OF THE THROTTLE.

Answer 2

Hey Air4

Congrats. on the new bike - I guess you were good all year and Santa was kind.

I hope you've got it started by now, but if you haven't try posting this question in the 'cars and transportation' section under 'motorcycles' as you get more techie types post there (add Merry Christmas Guard rail Jim - and you are bound to get a great answer!)

This section is for racing related questions - so in a few weeks when you are (racing) come on back!!

Have fun.

Answer 3

thats odd.. a new bike should start rite up.. take it back and buy a yamaha or honda   not a bike from kragen.autoparts

Answer 4

replace it with a Honda........ when was the last time it was serviced???? a new plug may be in order....how old is the fuel. have you drained the float bowl . it may have water in it

Answer 5

Gas is on? Choke is on?

Answer 6

you put down the kiker on the right on push bown as hard as u can.

Answer 7

i have a four stroke 150cc  and i turn the gas on give the throttle a few twists, turn the choke up all the way and give it one or two kicks... starts right up but takes a lil to warm up.. hope this helps

Answer 8

pull out the clutch

Answer 9

As Dingo has stated above, this is not a RACING question.

Dont you think you would be better following her advice?

Im sure you would.

Answer 10

take it to a shop and they can fix it for you and not that much.