06 yz 450 not showing any oil on the dipstick?

[YZ 450F SG]

Hello, I just got an 06 yz 450 from the dealer for pretty cheap because they couldnt figure it out either, theres a brand new oil pump and the filter is fine. I even drained the oil and filled it up even with a little more than you should put in and ran it for a few minutes, the pump is pumping but there is still no oil on the dipstick, any ideas? After the new oil pump was put in the mechanic took it for a 10-15 minute ride so if the oil wasnt getting to the bearings it would be seized by now. Any info will help this is my first 4 stroke. Thanks

Steve

[todds924]

Hello, I just got an 06 yz 450 from the dealer for pretty cheap because they couldnt figure it out either, theres a brand new oil pump and the filter is fine. I even drained the oil and filled it up even with a little more than you should put in and ran it for a few minutes, the pump is pumping but there is still no oil on the dipstick, any ideas? After the new oil pump was put in the mechanic took it for a 10-15 minute ride so if the oil wasnt getting to the bearings it would be seized by now. Any info will help this is my first 4 stroke. Thanks

Steve

Why did they replace the oil pump? Gray racer probably has a good idea whats going on with it. I have never heard of or seen this problem, let alone the need to replace a yz oil pump...except for a motor that ate a crank and the oilpump was replaced because of wear from the debris.

[YZ 450F SG]

The guy I was buying the bike said that the mechanics were not happy with the amount of oil it was pumping, they showed me the old oil pump and nothing I saw looked wrong with it, I really dont think they knew what they were doing.

[Ga426owner]

this is not good - oil pump is still not pumping oil.

[grayracer513]

There are two oil pumps in this engine, both driven by the same shaft, separated by a thin steel plate. The oil that lubes the engine comes from the integrated tank in the front of the engine (where the dip stick goes). the feed pump (the outer, thinner one) draws it from there, sends it to the oil filter, where it is distributed to the top end. the crank, and the trans shafts.

When it gets done there, it drains to the crankcase, where it's picked up by the return pump, and sent back to the tank.

What you need to do is to trace the oil passages in the bike and determine what's not happening. If you up oil in the crankcase, and it never shows on the dipstick, then it may be that the return pump is not moving oil as it should. Look at page 2-19, figure BB, and 2-20. The circuit runs from the crankcase screen to the pump, to the ignition cover, to the tank.

Remove the right crankcase cover, the clutch, and the ignition cover. You should be able to see the pickup screen and see if there's anything obstructing it. Then, you can chuck up a piece of rod or a drill bit in a reversible drill, slide a piece of hose over that, and drive the oil pump with the drill (it turns counterclockwise). Note that if there is oil in the tank, it will pump it straight out at you from the passage at 3:00 o'clock on the pump. That's the feed passage; we'll come back to that.

Be sure that there is some oil around the pickup screen, higher than the level of the bottom of the screen. As the pump is driven, it should pump it out at the lower rear corner of the ignition cover gasket joint (point B on page 2-20). If it doesn't, there's a problem with the screen, or the return pump, or the passageway itself. If oil flows, then next check that the passageway within the ignition cover is open clear through. If that checks out, be sure that the passage the the top front of the cover where it enters the tank near the dip stick is clear. You should then be able to put the cover back on and use the drill motor to pump oil from the crankcase to the tank, watching it flow in by looking down the dipstick hole. Once you get that to happen, the return circuit is OK.

Next, add oil to the oil tank by filling it through the dip stick hole. It should pump out of the feed pump output passage freely as the pump is turned (3;00 o'clock on the pump housing facing out). If it does not, remove the pump with the dip stick out, and oil should drain freely from the tank through a passage at 5:00 o'clock to the pump bore. Then check the passage leading to the oil filter (which has a low pressure check valve right next to the oil pump).

At this point, I might mention that if you use a ready racing filter cover, the filter can be installed backward, blocking feed oil to the engine.

See what you can come up with. Good luck.

[Yamaha4lyfe]

Grey i hope you get paid very well for what you do here. my dealer wouldent say such information to help out a customer.

if you guys had a place to donate, im 100% to donate aslong as help like you guys stay around!

Thanks for all your information for everything

[todds924]

Grey i hope you get paid very well for what you do here. my dealer wouldent say such information to help out a customer.

if you guys had a place to donate, im 100% to donate aslong as help like you guys stay around!

Thanks for all your information for everything

I second that vote. Very good/ knowledgeable information

[grayracer513]

Grey i hope you get paid very well for what you do here.

B)

That's funny

Nice thought, though.

[YZ 450F SG]

Hey thank you very much, now im sure I can get it going. I called a half dozen service places and they had no idea what to do. Thanks for your help.