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Jetting What is jetting? How does it work?

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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,,

Posted on Nov 10, 2008

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2014 KTM 250 SX plug fouling


air filter dirty can cause it to run rich. Should be cleaned every 10 hours of riding.
Mix should be at 40:1 in winter and 36:1 in summer. Use a ratio right dont guess on the mix.

Finally - get a JD jetting kit and install it! Crucial for all ktm bikes.

Curious what jetting are you currently running>

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HI My KTM 200 2002 model uess way to mutch fuel bout 50km to a tank. Any ideas


Thanks for contacting FixYa with your KTM inquiry.
50 kilometers is equivalent to 31 miles. The tank capacity is 2.9 Gallons indicating you are obtaining a very sub-marginal 10mpg approximately.
A couple things to check would be:
  • Leaks/cracks in the fuel line.
  • Access fuel is going somewhere - is it making OIL/Going out the pipe? Seals or Jets!
  • Excessive smoke out the pipe.
  • Pipe color coming out of the cylinder head (Cherry Red = over fueling)
  • Spark plug color - should be a nice cocoa brown is jetting is correct.
More than likely you have either a stuck float or a jetting problem. Both are very easy to fix. Tap the float bowl with a back side of a screw driver and see if it frees up. Test ride!
For jetting, you can raise the clip on the needle a couple of notches so the needle lowers and this should help conserve fuel in the middle RPM range.
The pilot jet and tower will gobble up fuel like crazy at low RPM's if they are to large a diameter. Refer to your manual and check the stock size for jetting and start with that. Elevation and temp has some effect on jetting as well. Just sounds like more than likely your needle and pilot jet are over fueling the engine.
Hope this gives you a few ideas. Let us know if we can be of further service,
Kind regards,
TF

Feb 24, 2011 | 2002 KTM EXC 200

1 Answer

I have a ZXR 750 J2 (1992 model) and it used to pull strongly from 10 000rpm through to the rev limiter, I got a dyno jet kit fitted and since then the power delivery has changed, it no longer pulls...


Did you had someone install the jet kit and adjust the valves? If you did i would take it back to the shop.If you did it then you will have to troubleshoot it to fined the cause. Do a spark plug reading this will determine if the bike is running lean or rich.And yes it is possible to have the timing off. Hope this helps
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1 Answer

Bike seems to be passing a lot of oil through exhaust. How much is normal?


The amount of unspent oil you see dripping from the end of your silencer is lovingly called spooge and it is a sign of a rich fuel condition. The common way to solve this by a jetting procedure. Your manual may be able to explain this, and the different jetting parts that are available, but be careful of errors in your manual. I've spotted at least 2 important ones in my 03 manual! Basically you need to replace/match jets for your particular conditions. Winter riding will be much different than summer for example. And Denver will be much different than somewhere at sea level. Find a jetting procedure for 2 strokes and test different pilot jets, needle jets, and main jets at your track until little to no spooge is seen. Be careful, of course, to also check your spark plug for a cappuccino colored tip to make sure you haven't jetted your carb too "lean". Finally, make sure to run 30:1 fuel mixture consistently through jetting (or 32:1, whatever your oil and bike manufacturer recommend).

Jun 20, 2010 | 2003 Suzuki RM 250

1 Answer

Baffelectomy


Well, now that you asked, by removing the baffles it changes the back pressure on the exhaust system. In some cases this causes need for re-jetting the carbs to make it run a bit richer. There are a lot of riders out there that like the louder sound of the baffles either drilled or removed entirely. The exhausts are factory tuned to match the jetting of the carbs.
Keep an eye on the exhaust pipes to see if they start turning blue. If so, it is a sign of the engine starving for fuel and would be a good time to consider re-jetting. Or, if you like the color blue and purple on your exhausts you can leave the jetting alone.
Ride safely, Ed

Apr 09, 2010 | 2007 Triumph Triumph Scrambler

1 Answer

1980 Suzuki GS 550L jets


the jetting/ jets are fittings inside of the carburators that allow onlky a certian amount of fuel to burn so the motorcycle does not flood itself out by having to much or to little fuel

Nov 27, 2009 | 1980 Suzuki Gs 550 L

2 Answers

My 87 yz 125 keeps fouling plugs can anyone help? It runs fine on a four stroke plug but is down on power as you can imagine but will also burn out my piston with long use mates have told me float levels...


Keep the correct plug in it.
If the plug looks black, it's due to too much fuel. You need to go smaller on your jetting. (You need to buy these at a dealer)
Your pilot jet will have a number on it. Get the number off of it and try a smaller step smaller. This effects your jetting from idle to 1/4 throttle.
The needle has a clip on it so you can raise the needle (lower the clip) up or down to effect your jetting 1/4 to 3/4 throttle.
The main jet also has a number on it, and this effects your jetting from 1/2 to full throttle.
Do your jetting by plug color. You don't want white (Lean) or black (Rich) You want chocolate brown.
Keep in mind that crank seals can screw up your mixture, as well as worn out rings, dirty air filter, or poor spark.

Oct 09, 2009 | 2003 Yamaha YZ 125

1 Answer

Jet


You definately have a jetting issue. Contact the manufacturer of the exhaust you purchased and ask them to recommend the jetting. You may need to change the primary, the needle and the main to get it right. beware that if you are running it lean as it sounds you are doing, you run the risk of siezing that engine. Fix the jetting before you ride much more. Best wishes!

Aug 14, 2009 | 1984 Yamaha XZ 550

1 Answer

Jetting


main jet = #165

slow jet = #42

Feb 09, 2009 | 2004 Honda CRF 450 R

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,,

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