Question about 1978 Yamaha RD 250

1 Answer

Oil pressure loss -

A guy with a 03 dumped the oil(for some unknown reason) while entering the freeway, reving and pulling hard through a few gears. At some point he noticed low oil pressure warning but failed killing the engine. He lets it idle a few hundred meters until next exit. He later filled it up with new oil, engine sounds ok at first but after 10 min it starts going bad with noise and metal parts in the oil. The rest we know.

Posted by on

  • Anonymous Mar 12, 2014

    I will crank and run fine at first. When it has been running for about 15 min or so, I notice the oil pressure light will come on and off. After that it will start missing and blowing out lots of blue smoke and die. After letting it sit for a few minutes it will crank up and run OK. The blue smoke will go way. What's up with this?? I checked the oil level and it is not low.



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 2,336 Answers

He must have had some other failure. A motor can go for longer than 10 minutes at idle with no recirculating oil. Had an old xr200 that made it about 4 hours with no oil, and we weren't being kind to it.

Posted on Nov 10, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Reason unknown for oil loss

only two reasons for oil loss
leakage and consumption

Feb 08, 2014 | 2005 Volkswagen Passat

1 Answer

P0841 2004 jEEP Overland 4.7HO 45RFE

IF the oil level is above the hot oil mark when cold then your problem is frothing of the oil from excessive oil . This causes a loss of pressure in the gearbox pump and the pressure is not there to activate the clutches and bands. Correct the oil level to where it should be and if the problem persists have a pressure test done on the gear box.

Aug 31, 2013 | Cars & Trucks

1 Answer

No speed when gas pedal is to floor tranny light came on

With the oil light coming on and the brake pedal being hard to press I would say that the engine stopped hence no vacuum -no power assist from the booster.- hard brake pedal. The lock uo feeling may come from the engine seizing up while you were still in gear

Feb 02, 2013 | 2003 Jeep Liberty

1 Answer

Transmission Fluid Pressure Sensor/Switch

I had a similar problem in my Mazda truck before. There is a pressure switch on the side of my truck's automatic gear box. The switch is connected to the engine vacuum system. When the switch leaks, the vacuum sucked the transmission oil through the vacuum line to the engine over time. Have you checked your transmission oil level? If the oil level is low, that's probably the reason. I was still able to drive back home by adding sufficient amount of transmission oil.

Good luck.


Aug 07, 2012 | Chrysler PT Cruiser Cars & Trucks

2 Answers

I have a 2003 monte carlo ss i fixed the intake gasket but now the car losses oil pressure i changed the oil and put in 10 w 40 new filter found out i use the wrong oil so i changed the oil to 10 w 30...

It is hard to say without being able to check the vehicle. It is possible that gasket material, silicone, etc. ended up inside the engine duing the repairs and is now stuck in your oil pump screen. It is also possible that you really do not have low oil pressure and the gauge is "lying" to you.

The way to find out is to remove the oil pressure sending unit and install a manual gauge. Take an actual pressure reading to see if the car's gauge is accurate. If it is not accurate, you most likely need a new sending unit. If you find that the oil pressure is actually low, then it is time to pull the oil pan and look inside to see what kind of damage or debris is in the oil pan.

Mar 18, 2012 | 2003 Chevrolet Monte Carlo

2 Answers

2000 daewoo nubira low oil pressure and no oil pressure sometimes

There are only two valid reasons for low oil pressure...bad bearings on crankshaft or obstructed oil pickup screen for pump...pump can be damaged by debris or hard carbon from either source but generally will not fail on it's own.
You may not be happy to hear this answer, but that's how it works on every engine, not just yours!!!
Good luck with it

Oct 26, 2009 | 2000 Daewoo Nubira

2 Answers

Lifter tick after a fast ride on freeway

have the valves been adjusted? Is the cam chain tight? Many things can give you a tick. Is the exhaust leaking?

Jul 03, 2009 | 2002 Honda VT 1100 C2 Shadow Sabre

1 Answer

This is my second try-was not helped on first try ---ONLY BILL ONCE GUYS!!! (only just under 54k orig. miles) --was running down the freeway just fine...then got off freeway to go back opposite direction...

A pressure test with gauge on the transmission case pressure port will rule out any possible fluid pump or. torque converter lockup problems
A quick band/clutch test should suffice to answer a burnout and,
if your transmission fluid smells burnt this is also a good indication of failure A code should register but, is there is no sensor in the area of failure there may not be

Jun 02, 2009 | 2000 Lincoln Town Car

2 Answers

Dumped oil driving down freeway...

let me know.... as i'm guessing the oil plug was not properly tightened.... the oil wouldn't take long to drain especially if it was hot.


Jan 23, 2009 | 2005 Ford Focus

Not finding what you are looking for?
1978 Yamaha RD 250 Logo

Related Topics:

160 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts


Level 2 Expert

314 Answers


Level 3 Expert

1216 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1165 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides