Question about 2005 Honda CRF 250 X

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Xr200 New to us, 2002 xr200 fouling plugs, found bike had the wrong plug corrected with ngk recommended, air screw was at 2 1/2 turns, corrected to 1 1/2. still fouling plugs and running rough for 1/2 hour then curse time. Any help would be appreciated!

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It sounds like the previous owner liked to tinker with the carb. I would pull the carb, CLEAN IT and check what size jets are in it. #115 is the stock main jet. #38 was the stock slow speed jet used that year. In the center of the slide, check where the clip is set on the needle. Position the clip mid- range of adjustment. If the bike bogs when you open the throttle, move the clip down one notch. Two notches may be needed but start with one. Be sure the owner has not lost the needle jet holder, part #16 on the parts diagram I am sending you to. Both the air and idle screws start at one & one half turns. Look at the tips of the adjusters. If they have a "ring" mark or depression mark where they were screwed in too tightly, then the screw(s) and jets should be replaced. These are adjusters and not really a screw. Seat them LIGHTLY then come out 1.5 turns.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx Go to the "CARBURETORS" tab to see the assembly. There is a slight chance the OHC may be one tooth out of proper position. We will check that after the carb has been put in order and tested.

I hope you will be able to rate this answer as "Very Helpful". Thanks

Posted on Jun 15, 2009

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1 Answer

My 85 cr250 keeps going through spark plugs quick.


A spark plug should last 20,000 miles or more. When you say goes bad what is happening burnt away electrodes, wet, fouled with metal particles, no spark? Check for the correct plug type in the user manual. Do not use another make. Make sure gap is correct and try bike again. Check plug color it should be light brown/grey, if black you need to check fuel mixture and choke assembly. NGK make Iridium plugs they give better sparks than normal NGK's try these if all else fails. Make sure the iridium[s] are correct for your bike eBay have great deals on plugs.

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1 Answer

Why does my dirt bike keep fouling plugs


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.
Also, 2-strokes have reeds that air and fuel go through into the cylinder, so if they are cracked or broken the bike will not run right. This could cause the plug to foul, so before you go out and buy anything expensive, make sure the reeds are in good condition.
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.
5. Piston rings badly worn or broken.
6. Faulty ignition coil low output.
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Trying to set air / fuel ratio 1977 sportster zenith carb.bike will start run foul plugs black smoke.tried air screw in till die screw out 5 half turns.3 full turns cannt find sweet spot rebuilt zeni


Hi Anonymous, take a ride over to your local dealers service department, I'm sure they will be happy to offer advice and assistance concerning your issue. Have a nice day.

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1 Answer

2005 Honda CR 85 R keeps fouling spark plugs


Hi, William and 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 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.
Also, 2-strokes have reeds that air and fuel go through into the cylinder, so if they are cracked or broken the bike will not run right. This could cause the plug to foul, so before you go out and buy anything expensive, make sure the reeds are still good.
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.
5. Piston rings badly worn or broken.
6. Faulty ignition coil low output.
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1 Answer

I bought a 92 fzr 600 ride it for a month no problem. But now it keeps popping the resistor in the spark plugs. 3 sets of plugs in the last 2 weeks. Last set lasted 2 days. All have been ngk.


NGK plugs dont stop, especially all at once, so there is another problem.
There are some resisters in the plug caps that can fail.
Are the plugs carbon fouling?(dry black) if so make sure the air filter is new, and oil is changed.
Does the enginge blow smoke or use oil?(wet black)oil fouled may mean rings.
Fuel fouled may mean the jettting is wrong or choke stuck open
Its the battery good(new) and charging ,put a multi meter across the terminals 12v stopped, 14v running approx.
it always helps to drain the carb bowls every few weeks
If exhaust is not standard, the jetting may be wrong.
does the fuel tap work correctly? only use the run or res positions never pri
A short in the kill switch or a worn ignition switch can cause a miss or backfire

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2 Answers

My bike is running really rich and keeps fouling out the plugs. Whats the problem with my bike??


Dirty air filter is the most likely cause. Will your bike run leaner with air filter removed? DId you recently move to a different elevation? air fuel ratio needs adjustments in that case. Have you recently installed aftermarket intake or exhaust components? if so the air / fuel ratio adjustment is also required. To check for leaner running with air filter removed, you should buy some new spark plugs so you can see condition of plug correctly on the new plugs. First run the bike at 1/4 throttle for 15 minutes and remove plug and inspect. install new plug and repeat test for 1/2 throttle, 3/4 throttle, and full throttle, replacing the plug prior to each run. The throttle positions can be marked off with white tape and black tick-marks. you will put a white piece of tape on your rotating throttle with a single black tick mark and then you will take a second piece of tape on the stationary part of oyur handle bar and put a mark for 0 and full , then half, 1/4 and 3/4. these marks will help you maintain postion during the tests. The plug conditoin will reveal which fuel circuit you should address for your fouled plugs.

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1 Answer

My yz wont start, changed spark plug it ran for 1/2hr then died


Couple things- 1. If the plug was dirty after 1/2 hour you have either the wrong heat range plug(too cold) or 2. a fuel/carb issue. Buy a hotter NGK plug, ask for help the numbers don't always make sense. Use only full synthetic 2 stroke (I always liked bel-ray) and fresh 93 octane fuel. When you find a plug that works good buy a case of them, 2 stokes will foul plugs period. And some advice with your solution, never head into the woods without a spare plug, they will foul at the absolute worst time.

Don't forget to rate please!

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3 Answers

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When you remove the plug,is it wet with black oily deposits or is the plug dry with a black deposit,also check if the plug has a greyish white appearance,is there deposits between the two electrodes....?If you can give more info maybe I can assist.

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