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How do i alter the air/fuel mix - MX 125 TM Racing Motorcycles

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If your bike has a carbertor theres a screw that you can tern to adgust how much fuel goes into the carb this will make the engine run rich or lean

Posted on Aug 06, 2010


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Engine is running rich, spark plug is black, spark arrestor is black, after only 2 tanks, do they have smaller jets for this carb

you need to alter the fuel mix. there is a fuel mix screw on the side of the carb. screw in for less fuel. then check on ldel loads on spark plug... then test on full load then check spark plug again. dont mix up the idle screw with the mix screw. should have a white film on idle speed and a slight red colour or full load. run for 10min at a time then check.

Jan 08, 2014 | Yamaha Ef2600 Generator/inverter...

1 Answer

Only runs with full choke, I bought the bike last week and the float needle was stuck and I think it had bad gas. so I changed the gas, cleaned the carb, reset the float needle. I also set the main slide...

Hi mate reverse the needle clip position back to factory setting this issue is pilot circuit for sure - If you have cleaned carbi you need to replace or clean the pilot jet and compress air clean the hole where the pilot jet came out of to clear the circuit. Running only with choke on is classic symptom of block pilot circuit...
Also check you fuel air mix screw this may have been altered trying to correct this issue it should be 1.5 - 2.5 turns out from fully closed..
all the change of needle position clip is doing is allowing your bike to run off the main jet (not good)
and reason for running with choke on is it is changes air fuel mix with choke on compensating for lack of fuel from the pilot jet blockage
regards Jamie

Aug 07, 2011 | 2004 Honda CRF 150 F

1 Answer

What is the proper ratio to mix of the oil to gas?

There is a big range of answers to that question but to give you some idea of the answer 32 parts petrol to 1 part oil - right up to 60 parts petrol to 1 part oil is the range of ratio that most commonly would be used . to give some insight in simple terms the more fuel and less oil mixture you will burn hotter and produce more power but sacrifice wear and tare on the motor
realistically the mix you choose depends on what sort of riding you intend to do - if you are racing and want the hole shot then 50 - 60:1 mix with half pump fuel and half race fuel will get you there but you will be rebuilding the top end fairly regularly
For recreational use only then 40:1 mix with standard pump fuel only would be the most common as it is in the middle of the range giving you good power with high level lubrication so ware and tare kept to minimum.
if you make changes to fuel mix then keep the changes small just alter the mix slightly and record the results because you will also find each bike responds a little differently
when I am setting bikes up for events I usually will go out to test area with 3 or 4 bottles each just with 500 ml of different mixtures in them and give each mix a test just for five or ten minutes then once the best mix chosen the I start fine tuning the carbi fuel air mix etc only takes an hour or so and what the hell it's a lot of fun to do any way!

Jun 07, 2011 | 2002 Honda CR 125 R

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Would it be possible for you to let me know what oil /fuel ratio can be made for a CR125cc 2004 HUSQVARNA. well the previous owner had 40:1 yet he may have been trail riding how can i alter my performance...

Yes 40 - 1 mix is a common race mix and if you dont do weekly maintenance and regular rebuilds you would be better at 32-1 33-1 mixes as this is more oil to fuel mix so better lube and lower burn temperature inside the motor.
when changing to higher oil mix make gradual changes to the fuel mix 1 tank at a time and record your ration as your bike will respond to the changes sometimes well sometimes bad but if you do small steps and record the result you will know what mix is best for your area and bike
In short the more oil you can give it and still ride well the better fore engine life (within reason) but you will lose some performance compared to less oil mix like 40 - 1 ratio (race mix)

May 22, 2011 | 2004 Husqvarna CR 125

1 Answer

The light Check engine is ON

Here are some very common causes for the engine light to com on.

1. Low fluids, make sure all of your fluid levels are where they should be, particularly the oil.

2. MAF, ( mass air flow ) sensor. This controls the fuel/air mix ratio to the engine.

3. Oxygen sensor, there are 2, ( front means before the catalytic converter, back means after the catalytic converter ) The front measure fuel/air mix, the back measure the emmisions from the fuel/air mix and tells the computer what adjustments need to be made to the fuel/air mix ratio.

I hope this helps you.

Feb 02, 2011 | 2007 Toyota Corolla

2 Answers

How do you set the timing on a 01 yamaha yz 125 or why else would it be melting the spark plug prob off with a 32:1 fuel mix and the plug that goes in the bike from the factory

melting spark plug is too lean. exhaust gas high temps caused by too much air. your oil to fuel ratio is correct, but your air to fuel ratio is not. adjust your needle clip position to add more fuel to the carb by lowering the C clip. this will raise the needle, giving you more fuel for the same amount of air. also check air filter element for tears.

Nov 22, 2010 | 2003 Yamaha YZ 125

1 Answer

My 30000 btu pro com blue flam has about 35% orange flams

You probably have a plugged orifice. The gas is injected into the burner via a small orifice and, when this plugs, the air / fuel mix is altered, causing the orange flame. Find your owners manual to find out how to replace the orifice or you could take it to a small engine repair facility locally who should be able to fix your problem.
Hope this helps!

Nov 05, 2010 | Procom ML300TBA Heater

2 Answers

Error code says it is running lean. I replaced the air filter and cleaned the sensor. what other possibilities?

Air/Fuel flow mixture screw needs altering as mix is too lean and will keep causing problems.

Jun 22, 2010 | 2003 Jaguar S-Type

1 Answer

I need to alter the fuel/air mixture

plz visit this site it may be of help to you.


Mar 04, 2009 | 1998 Yamaha YZF-R1

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