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Jetting for 2013 YZ250 for 3000 to 4000 ft of elevation with Vforce 3 Rees valve and pro circuit spark arrestor

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Posted on Jan 02, 2017

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SOURCE: Jetting a 2001 YZ426

will a 1989 yz426 motor fit in all years

Posted on Dec 05, 2009

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What should the jetting be for a 1994 yamaha yz 250 at 5000' elevation


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YZ250 Jetting Yamaha 2 Stroke
jetting yz250 for 5000 Yamaha 2 Stroke
Yamaha YZ250 Owner Service Manual
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Yamaha yz250 2015 Owner Manual

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Burner is not kicking in high flame


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1 Answer

Jeting for 4500 foot elevation on 99 cr 250


The jetting needs to leaner (smaller) in higher elevations.Remove the jets from the carb thru the 17mm drain bolt in the bottom of the bowl using a 6mm socket for the main and a #1 flat screwdriver for the pilot jet and identify the sizes stamped on the jets. Get a selection of smaller jets1- 4 sizes down from what you have. Start with the pilot jet-that controls the idle. Once it idles smoothly with the idle air adjustment screw 1-3 turns out it's good. The main jet should be varified by checking the spark plug- a clean plug with proper jetting should be a nice tan color after 5 min. of running 1/2 to full throttle. If it's white, your'e too lean. If it's black, it's too rich. Remember, 2 strokes will run lean very well right up until they burn down so always check the plug.

Jun 07, 2011 | Honda CR 250 R Motorcycles

1 Answer

I have a 98 yz125, i race it but seem to have a lack in power in certain areas, ive changed my jetting a few times but seem to find the power else where and NOT where i need it, as of rite now im running a...


I would first make sure the power valve is decarboned and moves smoothly. Jetting is trial and error as so many things can affect the mix. Temp. humidity, gas quality, oil ratio etc. Tht being said you can make small changes and keeping a log with results. First write down baseline settings. Include main jet and pilot jet numbers found stamped on the jets and needle number. You don't say where it is you are trying to get power. 125s have poor bottom mid power, it is all on top for racing. Don't change and race or you may keep going when you should stop and melt something. Try to test at the altitude where you will race and read the plug often, cleaning or changing the plug between tests. Be alert for the surging feel of lean mix with racing idle do not let this continue. Remember 0 to 1/4 throttle, pilot and needle base width. 1/4 to 1/2 throttle controlled by needle mid taper. 1/2 to 3/4 throttle needle tip and main. 3/4 to full is the main jet. Find out the stock settings and make sure to start near there. I don't know about a spes pipe but pro circuit has charts for jetting and maybe a support line. I really feel you will get more from a clean powervalve, repack the silencer, clean airfilter and maybe v-force reed. Gearing can offer some options. I just read about a James Dean jet kit for cr250 that puts more power in the low mid. I might try that for my bike. Good luck, just remeber " too lean, too long- too bad"

Apr 06, 2011 | Yamaha YZ 125 Motorcycles

1 Answer

I have an 5 HP briggs motor horizontal shaft. Once the motor is running and gets warm and put under any load it stops running . I pulled the head off and found oil on the pistion and the exast valve had...


You may have a spark arrestor on the carburetor bowl that is designed to stop backfires and shut off fuel in the event of a motor fuel fire. It has a temperature sensor like a thermostat. If you see a wire going to the carburetor bowl, that would be the spark arrestor where it screws into the bowl.

When these fail, the motor will shut down each time intermittently after the motor gets good and hot. The fix is to replace the spark arrestor or match the threads and screw a bolt in place of the
spark arrestor. If you use a bolt, the motor may backfire when you shut if off unless you have a "fuel shutoff" valve installed in the fuel line and turn off the fuel each time before turning off the motor.

Feb 10, 2011 | Garden

1 Answer

Just bought a 2001 WR 426. Has an FMF pipe, no air box lid. Main is a #165 and pilot is a #42.these are stock jets according to shop manual. My elevation is 2500-3000 Ft. Any ideas on jetting?


Hard to give accurate info with out seeing the bike with jetting but I would suggest take a reading from the fuel air screw if the bike running better with the fuel air screw in carbi at 2.5 turns out or more then definitely increase pilot jet up 1 or 2 sizes if you get the bike to run well between one - two turns out on the fuel air screw that is where your jetting should be
I wouldn't be concerned with main jet at all - it should be fine for wide open throttle unless you feeling power loss when you open it right up
also if you are getting backfire or popping when de accelleration that also hints toward lean pilot so a size or two change in pilot jet would be worth trying

Jan 20, 2011 | 2001 Yamaha WR 426 F

1 Answer

What should the stock carb jets be for a 94 yz250 with the stock pipe and aftermarket silencer


Stock Jetting for a 1994YZ250 is:

350 main
45 pilot
J8-6EJ33-61 needle

Adjust your jetting down one size for each 1000' of elevation above sea level. Needle clip position on the needle fine tunes the pilot circuit.

Scott

Dec 12, 2009 | 2003 Yamaha YZ 250

1 Answer

Jetting a 2001 YZ426


will a 1989 yz426 motor fit in all years

Mar 20, 2009 | 2001 Yamaha YZ 426 F

1 Answer

Jetting


WHAT MEAN JET? : Carb jetting can be easily understood if we understand the basic principles of carb and engine operation. A carb mixes fuel with air before it goes into the engine. When the mixture is correct the engine runs well. The bottom line is a carb must be adjusted to deliver fuel and air to the engine at a precise ratio. This precise ratio can be affected by a number of outside and inside influences. If you are aware of these influences you can re-jet your carb to compensate for the changes. I'm going to show you some examples of how you can change your jetting for better performance and in some cases increased engine life. As with any engine work be sure you have good tools the correct parts and a good manual before you get your hands dirty! ALTITUDE COMPENSATION: For our first example let's say we find a new riding area WAAY up in the mountains. Our jetting is dialled in for our usual riding area which ranges from sea level to 1500 feet. Our NEW riding area starts at 4000 feet and goes up from there. Going to a higher elevation will require will require a jetting change but which way? Like our fuel density air density can also change. Higher elevations have less air density then lower ones. At high elevations our engines are getting less air so they need less fuel to maintain the proper air/fuel ratio. Generally you would go down 1 main jet size for every 1750 to 2000 feet of elevation you go up (info for Mikuni carbs). If you normally run a 260 main jet at sea level you would drop down to a 240 at 4000 feet. Something else goes down as you go up in elevation is horsepower. You can figure on losing about 3% or your power for every 1000 feet you go up. At 4000 feet your power will be down about 12%-even though you rejetted! For our second example let's say we are still at our new 4000-feet elevation riding area and a storm comes in. We head back to camp and ride it out overnight. The next day there's a foot of snow on the ground the skies are clear and it's COLD!. Aside from getting the campfire going and making some coffee you should be thinking about jetting again! Cold air is dense air and dense air requires bigger jets. If the 240 jet ran good the day before you will need a bigger jet to run properly today. If the temperature is 50 degrees colder,,

Nov 10, 2008 | 2005 Hartford VR 200X

1 Answer

Jetting


WHAT MEAN JET? : Carb jetting can be easily understood if we understand the basic principles of carb and engine operation. A carb mixes fuel with air before it goes into the engine. When the mixture is correct the engine runs well. The bottom line is a carb must be adjusted to deliver fuel and air to the engine at a precise ratio. This precise ratio can be affected by a number of outside and inside influences. If you are aware of these influences you can re-jet your carb to compensate for the changes. I'm going to show you some examples of how you can change your jetting for better performance and in some cases increased engine life. As with any engine work be sure you have good tools the correct parts and a good manual before you get your hands dirty! ALTITUDE COMPENSATION: For our first example let's say we find a new riding area WAAY up in the mountains. Our jetting is dialled in for our usual riding area which ranges from sea level to 1500 feet. Our NEW riding area starts at 4000 feet and goes up from there. Going to a higher elevation will require will require a jetting change but which way? Like our fuel density air density can also change. Higher elevations have less air density then lower ones. At high elevations our engines are getting less air so they need less fuel to maintain the proper air/fuel ratio. Generally you would go down 1 main jet size for every 1750 to 2000 feet of elevation you go up (info for Mikuni carbs). If you normally run a 260 main jet at sea level you would drop down to a 240 at 4000 feet. Something else goes down as you go up in elevation is horsepower. You can figure on losing about 3% or your power for every 1000 feet you go up. At 4000 feet your power will be down about 12%-even though you rejetted! For our second example let's say we are still at our new 4000-feet elevation riding area and a storm comes in. We head back to camp and ride it out overnight. The next day there's a foot of snow on the ground the skies are clear and it's COLD!. Aside from getting the campfire going and making some coffee you should be thinking about jetting again! Cold air is dense air and dense air requires bigger jets. If the 240 jet ran good the day before you will need a bigger jet to run properly today. If the temperature is 50 degrees colder,,

Nov 10, 2008 | 2002 CCM 604 DS Dual Sport

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