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96 yz250 As you can see I rode it for a sec and it cuts off. Not only that I keep fouling plugs I run like 40:1 gas. I have no clue why it runs when it's cooler and just doesn't want to stay running. I would also like to kno how to adjust my idol cause I have to keep blipping the throttle to keep it running

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  • Contributor
  • 17 Answers

If it consistently shuts down when it warms up you are probably losing ignition. It sounds like you have a weak ignition coil. There is two or three different adjustments you can make to the carb. Idol speed, low speed mixture screw(pilot) and high speed mixture screw(main jet) If you can get a good vid of the carb I can direct you

Posted on May 02, 2013

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6ya6ya
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Posted on Jan 02, 2017

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  • 9 Answers

SOURCE: MY YZ250 WONT REV PAST 3/8 THROTTLE. I NEED HELP!!

It does sound like an ignition timing problem, but could also be a breathing issue, air flow in or exhaust flow out could be restricted i.e.:dirty air filter, excessive carbon build up in exhaust pipe from burning too much oil or rich fuel mixture.
possibly and more likely some junk got into your fuel system and partially plugged up the main jet in the carb, -or has the needle on the slide been moved? The little circlip at the top of the needle, if it has one.
1.Replace the spark plug, check gap, check spark, it should be bright blue and fat.
2. check the fuel filter, if no filter check the carb for dirt.



Posted on Jan 20, 2009

  • 3567 Answers

SOURCE: Yamaha Riva won't idol

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There may be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Be sure the bolts are tight. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.

Posted on Apr 07, 2009

  • 1 Answer

SOURCE: Ignition Fuse keeps blowing

From another forum,

"You've got an exposed hot wire somewhere in the power circuit that's grounding out and causing resistance in the wire. Not sure how to help on this one, electrical problems are damn near invisible, but I'd start looking for a burn mark or scorched insulation on any of the wiring leading up the relay, starter, or main fuze block in the tail."

Posted on Jun 11, 2009

  • 8 Answers

SOURCE: My 1996 yz250 will run and idle. But not open to full throtal

Change plug

check crank seal (air side)

check correct fuel flow

rings ?

Posted on Jul 15, 2009

DoubleClutch
  • 376 Answers

SOURCE: running rich causing fouled plugs. what to do?

What has been done to the bike resently? If you havent changed anything with the air intake or the exhaust then you my have carb problems.

Posted on Sep 29, 2009

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What number plug should I be running in my 2002 125 rm suzuki


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Hi, Joey assuming it's a 2 stroke the usual suspects are:
1. The first thing to do if your spark plug has been fouled is to check the air filter. If it's really dirty, that makes it difficult for air to get through to the engine, causing a rich condition. Either clean it thoroughly with some Air Filter Cleaner or buy a new filter. Before you put it back in the air-box, treat with a fine mist of some air filter oil or spray. "WARNING" adding too much oil can also clog up the filter, resulting in another fouled plug.
2. While the gas/oil ratio doesn't equate to what the jetting is, you can still foul plugs, or worse, if the mixture is wrong. Depending on your bike, it's best to look at your owner's manual for the correct ratio. For most 2-stroke motocross bikes, a ratio is 32:1 or 40:1, the gas being 32 or 40, and oil being 1. For those that don't it, it means that for every 128 ounces (one gallon) of gas, you add 4 ounces of 2-stroke oil for a 32:1 ration, or just over 3 ounces for a 40:1 ratio.
If you have too much oil in the mixture (such as 12:1), then you will probably end up fouling the plug because it is more difficult to burn that much oil. Don't try to cut corners with the oil though, because it's very important for your dirt bike's engine. 2-stokes need the oil for lubrication on the cylinder walls, so if you don't have enough (or any for that matter) then the cylinder walls will run dry, causing it to overheat and seize the engine very quickly. So it's very important that you put in the right mixture pre-mix to your 2-stroke gas tank.
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3. While this usually isn't the main problem, it could be that your spark plug isn't burning hot enough. Having a hotter spark will ignite the fuel stronger, leaving less residual gas/oil in the cylinder that could cause the plug to foul. This "ISN'T" the best choice, but I'd say it's safe to go one plug hotter than stock. Keep an eye on the plug color you're looking for a light tan color anything whiter and you could burn a hole in your piston. Spark plug manufacturers aren't always the same, so make sure you find out how they rate them.
4. Almost every motocross bike comes rich from the factory (especially Honda 2-Strokes when they were being made). It's usually a pretty simple fix, but many riders are too lazy and would rather continue buying plugs instead of spending a few bucks on jets.
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