Introduction: 7 Things to Do When Your Dirt Bike Won't Start

Sometimes when your dirt bike does not get used, it won't start.

Here are some ways to start a "mad motor."

Step 1: Follow These Steps to Get Your "Mad Motor" Running

1. Make sure the gas line is ON.

2. Make sure you have gas in the dirt bike.

3. Make sure the spark plug boot is pushed in.

4. Make sure you have spark. To test for spark, take the spark plug out from the head, but not out of the boot. Put it against some metal on the bike and turn it over while kicking the kick start (or if you have an electric start, use that). You should see spark. If you see no spark, then put a new spark plug in. Make sure to put the right size spark plug in and do not over-tighten the spark plug.

5. Use choke.

6. If the motor has not run in a long time (i.e. more than 1 year), you should put new gas in it.

7. Once you have done all of these steps and it still won't start, then clean the carbs.

8. Clean the air filter.

Comments

author
JohnH664 (author)2016-09-17

look i have a 2003 honda cr85 that wont start I've changed a Magneto change the spark plug to the carburetor rebuild kit and check the reeds I know it needs a new stator I push started it once and got it to crank up but after that it won't do nothing but bog out trys tp start but wont it doesn't seem to be getting gas it had a little bit of nasty milky water in the head I checked the head-to-head seems fun and it seems like it has good compression but I can't get it to crank up even if I push start it again I don't know what to do please help

author
JohnH664 (author)JohnH6642016-09-17

I've even checked the kill switch the one time it started it took off on me but the throttle wouldn't give it gas or slow down it just took off as fast as I can go and I had to hit the kill switch I really don't know what to do i mean the head and the piston looks fine it's got compression I clean the exhaust pipe and change the oil too

author
chantimm04 (author)JohnH6642017-05-17

i think your problem is its idled to high

author
JonH129 (author)2016-09-26

my bike started up and i let it run for a minute and when i went to leave it staled, ive checked the plug and my magneto and it still wont start, if you think you know the issue text me at 810-341-2351 thanks

author
hflorman (author)JonH1292017-05-07

You might wanna try turning UP the idle

author
Wywon1 (author)2017-03-18

I tried all of these things, still won't start it wants to start but it doesn't I have a 1990 kx80 text me to help me out 720-618-5970

author
JohnH664 (author)2016-09-17

if u can think of anything text me 5042566965

author
JanD100 (author)2016-09-16

I did all these steps put a new carb new spark plug for my 125cc sdg mini speed pit bike still wont start sound like backfiring in the engine like a cough

author
DylonW (author)2016-06-02

Hey guys i have a 2001 rm 80 and i took it down the street for a little to long and it shut off i put a new piston in it but still wont start. Ive tried roll starting it and itll run for a sec and then shut right back off. Ive changed out all the oil and not sure else what to do what do you think?

author
hflorman (author)DylonW2016-06-04

Might have been the spark plug or the spark plug boot.

author
hflorman (author)hflorman2016-06-29

True.

author
hflorman (author)DylonW2016-06-04

It might have overheated.

author
JacobA31 (author)2016-03-29

Mine keeped bogging down in first after I cleaned the carb and the air filter and all of the sudden it was hard to start and once I got it started and i had it at full throtal in 3rd gear and it bogged down and died and it wont start and it has plenty of gas and is getting spark. any help?

author
TerrellB3 (author)JacobA312016-06-28

Could use a tune

author
JacobA31 (author)TerrellB32016-06-28

I think there is something wrong with the rings or there is a hole in the piston soon i will take it apart

author
TrevorK18 (author)2016-05-17

What would you guys think the problem is...i went to go ride my bike after riding it a few hours rhat day and then it just souldnt start...its a yz250...i changed the plug and all that...it partially turns over and i smell gas...any thoughts?

author
mykiscool (author)2015-08-09

Easy starting technique (won't fix hardware issues except the kickstarter)

1. Walk to the side of a steep hill

2. Shift into 1st and pull in clutch

3. Push of the side of the hill

4. When you get going fast let the clutch out and give a small ammount of throttle

author
mattydeee93 (author)mykiscool2015-08-17

Personally i find doing it in 2nd gear is more effective as there is more chance of you being able to turn the engine over, i also jump down off the pegs onto the seat just as i let the clutch out

author
mrandle (author)mykiscool2015-08-16

I find second works a bit better depending on the situation. Especially on flat ground.

author
hflorman (author)mykiscool2015-08-10

Always works.

author
DoStuffRight (author)2015-08-06

if it has been sitting with gas for a little bit, the pilot jet is most likely clogged. this could also be the problem if the bike sounds like it isn't getting enough gas.

author
dgodwin3 (author)2015-08-06

Another good trick is to take out the spark plug and put a little gas down the hole to get it fired if it sat all winter.

author
rottnjeep (author)2015-08-06

Good ideas for just about any small engine that people sometimes forget about

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