426 in cold weather

2 replies to this topic
  • Morten

Posted February 20, 2001 - 02:02 AM


My 00 426 is not running smooth in cold weather, 0 degrees celsius and below. It wont idle and there is a lot of small explosions in the exhaust system on higher RPM`s. Does anyone have a good advise on what to do.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Boit

Posted February 20, 2001 - 03:57 AM


Is this a series of pops....or explosions, as you call them..... happen when you close the throttle at higher RPM's? Cold air is denser and may be causing a slightly lean condition. My '00 426 runs great when it's cold outside....or when it's hot outside...doesn't seem to matter. However, each bike is different and you might benefit from enrichening a little. If your engine pulls strongly and cleanly at full throttle, don't touch the main jet. If it does the popping on decel as mentioned before, try turning your pilot fuel screw out(counterclockwise) in quarter turn increments. Mine is very sensitive to this adjustment. I get the best throttle response when this screw is adjusted such that I get an occasional "muffled" pop during decel.

[This message has been edited by Boit (edited 02-20-2001).]

  • MrMXer

Posted February 20, 2001 - 07:03 AM


Morton.. The first thing you must do is move to a warmer climate.. LOL, No seriously, Boit is right. The bike will need to be richened up a bit. 45 pilot and a 165 main should be a good place to start depending on your elevation. From there, adjust the pilot fuel screw .

[This message has been edited by MrMXer (edited 02-20-2001).]

Related Content

WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.