crankcase breather

2 replies to this topic
  • yamahazinger

Posted August 11, 2005 - 07:48 AM


i have heard and wondered for a long time what a crankcase breather does and where is it located? Also where does it connect into the crankcase? I have an 02 yz250 and am wondering if mine has one. I dont think so because i have never seen it. If anyone knows id appreciate an answer. thanks :D

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • CHEEZE13

Posted August 11, 2005 - 08:20 AM


Do a search in this forum on cyclinder head breather hose and read all you want.

  • grayracer513

Posted August 11, 2005 - 09:11 AM


It's the black, 1/2" hose on the left side that connects to the cam cover. Your engine displaces 250cc on both the top and the bottom of the piston, and some combustion gases always get past the rings. The breather gives all of that somewhere to go.

If you actually have a YZ250, and not a 250F, you don't have one. It's a two-stroke, and the craankcase is part of the intake stream.

Related Content


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

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On Yesterday, 06:20 PM

The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  113 replies

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 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.