Still pumping oil when you lay it over?

3 replies to this topic
  • wrenchard01

Posted October 24, 2004 - 07:18 PM


After the Ironman GNCC today, I had an engine noise, not terrible, but wrong. Layed it over two (several) times, once top end low, someone told me it might have stopped picking up oil. If so, whats the low down on this and does anyone know what is probably messed up? (Anybody's guess I'm sure) How much oil should be in the flywheel cover, and whats proper procedure for changing oil? will the drain plug change whats behind the cover?

  • gonzo

Posted October 25, 2004 - 10:10 AM


It's possible but they do have oil pumps so I dont know how probable it is.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted October 25, 2004 - 03:02 PM


Your YZF gets its oil supply from the oil tank in the frame, and because of the way the tank section is laid out, the frame tube has to be laying almost completely horizontal for the engine to starve the oil pump. This is not the case with most wet sump engines, which is where this little wive's tale came from. If not revved too high, or placed under a load, the engine will survive short periods without oil pressure with no damage anyway, but it's something to remember.

The flywheel cover is "in" the cranckcase, so oil is normally there. In operation, the return, or scavenge pump returns as much oil as it can get hold of back to the tank, so there won't be a lot while it's running. But as the bike sits for a number of days, oil will leak back down to the crankcase past the oil pump until eventually, all of the oil will be in the bottom. Which is something to think about before you just light the thing off and twist the grip.

"The Correct Procedure": http://www.thumperfa.../oil_change.htm

  • mnovarossi

Posted October 25, 2004 - 07:02 PM


My local Yamaha dealer told me the same thing when I showed them my junk piston I had just removed from my 426.

Related Content


YZ450F 03 Sparks driving me crazy by SirAttard

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies

Help with 2000 yz426 by weekend woods racer

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  36 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

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 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.